HomeMy WebLinkAboutChapter 05B Residential Building Code
CHAPTER 5B
RESIDENTIAL BUILDING CODE*
* Editor’s Note: Pursuant to section 107-28, Hawai‘i Revised Statutes (“HRS”), each County shall amend and adopt the Hawai‘i State
building codes and standards listed in HRS, section 107-25 within two years after adoption by the State Building Code council. If a
County does not amend, adopt, and update a State code within this time frame, the respective State code shall become applicable as an
interim County code.
Article 1. General Provisions.
Section 5B-1-1. Title.
Section 5B-1-2. Purpose.
Section 5B-1-3. Scope; exceptions.
Section 5B-1-4. Administrative provisions.
Section 5B-1-5. Existing buildings.
Section 5B-1-6. Definitions.
Section 5B-1-7. Compliance required.
Section 5B-1-8. Conflict.
Section 5B-1-9. References to model codes.
Article 2. Installation Requirements.
Section 5B-2-1. International residential code adopted.
Article 3. Adoption, Amendment, and Addition of Appendices.
Division 1. Appendices of International Residential Code Adopted.
Section 5B-3-1. Appendices not applicable.
Section 5B-3-2. Appendices of the International Residential Code adopted.
Section 5B-3-3. Appendix Q; Tiny Houses.
Division 2. Appendix Added to the International Residential Code.
Section 5B-3-21. Reserved.
Section 5B-3-22. Appendix U; Factory-built Housing.
Article 4. Building Work Within Special Flood Hazard Areas.
Section 5B-4-1. General applicability.
Section 5B-4-2. Definitions.
Section 5B-4-3. General Requirements.
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R ESIDENTIAL B UILDING C ODE §5B-1-1
CHAPTER 5B
RESIDENTIAL BUILDING CODE*
* Editor’s Note: Pursuant to section 107-28, Hawai‘i Revised Statutes (“HRS”), each County shall amend and adopt the Hawai‘i State
building codes and standards listed in HRS, section 107-25 within two years after adoption by the State Building Code council. If a
County does not amend, adopt, and update a State code within this time frame, the respective State code shall become applicable as an
interim County code.
Article 1. General Provisions.
Section 5B-1-1. Title.
This chapter shall be known as the “residential building code.”
(2021, ord 21-61, sec 1.) 5B-1-1
Section 5B-1-2. Purpose.
The purpose of this chapter is to provide minimum standards to safeguard life or
limb, health, property and public welfare by regulating and controlling the design,
construction, quality of materials, use and occupancy, location and maintenance of all
residential buildings and structures within the County and certain equipment
specifically regulated herein.
(2021, ord 21-61, sec 1.) 5B-1-2
Section 5B-1-3. Scope; exceptions.
This chapter shall apply to the design, construction, alteration, movement,
enlargement, replacement, repair, equipment, use and occupancy, location, removal and
demolition of detached one- and two-family dwellings and townhouses not more than
three stories above grade plane in height with a separate means of egress and their
accessory structures not more than three stories above grade plane in height.
Exception:
The following shall be permitted to be constructed in accordance with this code
where provided with a residential fire sprinkler system complying with, chapter 26, the
Hawai‘i County fire code:
1. Live/work units located in townhouses and complying with the requirements of
Section 419, “Live/Work Units” of the International Building Code as adopted
by chapter 5A, the building code.
2. Owner-occupied lodging houses with five or fewer guestrooms.
3. A care facility with five or fewer persons receiving custodial care within a
dwelling unit.
4. A care facility with five or fewer persons receiving medical care within a
dwelling unit.
5. A care facility for five or fewer persons receiving care that are within a single-
family dwelling.
(2021, ord 21-61, sec 1.) 5B-1-3
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§ 5B-1-4 H AWAI‘I C OUNTY C ODE
Section 5B-1-4. Administrative provisions.
Provisions relating to permitting, enforcement, inspection, and other
administrative procedures pertaining to this chapter are contained in chapter 5, the
construction administrative code.
(2021, ord 21-61, sec 1.) 5B-1-4
Section 5B-1-5. Existing buildings.
(a) Permitted buildings in existence at the time of the adoption of this chapter may
have their existing permitted use or occupancy continued if such use or occupancy
was legal at the time of the adoption of this chapter, provided such continued use
does not constitute a hazard to the general safety and welfare of the occupants and
the public.
(b) Alteration, repair, addition, and change of occupancy. Alteration, repair, addition,
and change of occupancy to a building or structure in existence at the time of the
adoption of this chapter shall comply with the requirements of the existing building
code, chapter 5C, Hawai‘i County Code.
(2021, ord 21-61, sec 1.) 5B-1-5
Section 5B-1-6. Definitions.
As used in this chapter, unless it is apparent from the context that a different
meaning is intended:
2
“Accessory structure” means a structure not greater than 3,000 square feet (279 m)
in floor area, and not over two stories in height, the use of which is customarily
accessory to and incidental to that of the dwelling and which is located on the same lot.
“Authority having jurisdiction” means the director of the department of public
works, or the director’s authorized representative.
“Building” means any structure used or intended for supporting or sheltering any
use or occupancy. The term shall include but not be limited to, any structure mounted
on wheels such as a trailer, wagon, or vehicle which is parked and stationary for any 24-
hour period, and is used for business or living purposes; provided, however, that the
term shall not include a push cart or push wagon which is readily movable and which
does not exceed 25 square feet in area, nor shall the term include a trailer or vehicle,
used exclusively for the purpose of selling any commercial product therefrom, which
hold a vehicle license and actually travels on public or private streets.
To the extent context otherwise permits and/or requires, the definitions of
“building” as used in chapters: 5A, the building code; 5B, the residential building code;
5C, the existing building code; 5D, the electrical code; 5E, the energy conservation code;
and 5F, the plumbing code; are incorporated by reference herein.
“Building work” means the design, construction, alteration, relocation,
enlargement, replacement, repair, removal, demolition of any building or structure, or
any other activities regulated by this chapter.
“Chapter” means this chapter.
“This code” means the residential building code, contained in chapter 5B, or the
construction administrative code, contained in chapter 5, or both, as the context
requires.
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“Construction code” means collectively: chapter 5, the construction administrative
code; chapter 5A, the building code; chapter 5B, the residential building code; chapter
5C, the existing building code; chapter 5D, the electrical code; chapter 5E, the energy
conservation code; chapter 5F, the plumbing code; and all administrative rules adopted
pursuant to these chapters.
“Dwelling” means any building that contains one or two dwelling units used,
intended, or designed to be built, used, rented, leased, let or hired out to be occupied, or
that are occupied for living purposes.
“Existing building” means a building erected prior to the effective date of this
chapter, or one for which a legal permit has been issued.
“Existing structure” means a structure erected prior to the effective date of this
chapter, or one for which a legal permit has been issued.
“ICC” means the International Code Council.
“Owner-builder” means owners or lessees of property who build or improve
buildings or structures on their property for their own use, or for use by their
immediate family. This definition shall not preempt owner-builder by exemption as
defined by section 444-2.5, Hawai‘i Revised Statutes.
“Permit” means a formal authorization issued by the authority having jurisdiction
that authorizes performance of specified work, pursuant to the construction code,
including the following chapters and all administrative rules adopted pursuant to the
following chapters:
(1) 5, the construction administrative code;
(2) 5A, the building code;
(3) 5B, the residential building code;
(4) 5C, the existing building code;
(5) 5D, the electrical code;
(6) 5E, the energy conservation code; and
(7) 5F, the plumbing code.
“Person” means any individual, firm, partnership, association, or corporation; or its
or their successors or assigns, according to the context thereof.
(2021, ord 21-61, sec 1.) 5B-1-6
Section 5B-1-7. Compliance required.
(a) No person shall perform or cause to be performed any building work which does not
comply with the provisions of this code or any permit issued pursuant to this code.
(b) No person shall perform any work covered by this code in violation of the provisions
of chapters 444 or 448E, Hawai‘i Revised Statutes.
(c) Any approval or permit issued pursuant to the provisions of this code shall comply
with all applicable requirements of this code.
(d) The granting of a permit, variance, or approval of plans or specifications pursuant
to this code does not dispense with the necessity to comply with any applicable law
to which a permit holder may also be subject.
(2021, ord 21-61, sec 1.) 5B-1-7
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§ 5B-1-8 H AWAI‘I C OUNTY C ODE
Section 5B-1-8. Conflict.
(a) If any provisions of this code conflict with or contravene provisions of the Hawai‘i
State Residential Code or the International Residential Code, 2018 Edition, that
have been incorporated by reference, the provisions of this code shall prevail as to
all matters and questions arising out of the subject matter of such provisions.
(b) In situations where two or more provisions of this code and any applicable law,
other than those provided for in subsection (a), cover the same subject matter, the
stricter shall be complied with.
(2021, ord 21-61, sec 1.) 5B-1-8
Section 5B-1-9. References to model codes.
(a) The codes and standards referenced in this code shall be considered to be part of
the requirements of this code to the prescribed extent of each such reference and as
further regulated in section 5B-1-8.
(b) Wherever a model code is referenced in this code, the following shall apply:
(1) The International Building Code shall mean the building code, chapter 5A,
Hawai‘i County Code;
(2) The International Residential Code, shall mean the residential building code,
chapter 5B, Hawai‘i County Code;
(3) The International Existing Building Code, shall mean the existing building
code, chapter 5C, Hawai‘i County Code;
(4) The International Electrical Code shall mean the electrical code, chapter 5D,
Hawai‘i County Code;
(5) The International Energy Conservation Code, shall mean the energy
conservation code, chapter 5E, Hawai‘i County Code;
(6) The International Plumbing Code shall mean the plumbing code, chapter 5F,
Hawai‘i County Code;
(7) The International Fuel Gas Code, the provisions of the International Fuel Gas
Code shall be deemed to be only guidelines and not mandatory;
(8) The International Mechanical Code, the provisions of the International
Mechanical Code shall be deemed to be only guidelines and not mandatory;
(9) The International Property Maintenance Code, the provisions of the
International Property Maintenance Code shall be deemed to be only
guidelines and not mandatory; and
(10) The International Fire Code shall mean the fire code, chapter 26, Hawai‘i
County Code.
Exception:
Where enforcement of a code provision would violate the conditions of the
listing of the equipment of appliance, the condition of the listing shall govern.
(2021, ord 21-61, sec 1.) 5B-1-9
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R ESIDENTIAL B UILDING C ODE §5B-2-1
Article 2. Installation Requirements.
Section 5B-2-1. International residential code adopted.
(a) The “International Residential Code for One- and Two-family Dwellings, 2018
Edition,” as published in 2017 by the International Code Council, Incorporated, 500
New Jersey Avenue, 6th Floor, Washington, DC 20001, is adopted by reference and
made a part of this code, subject to any amendments set forth in this chapter.
Hereinafter, the “International Residential Code for One- and Two-family
Dwellings, 2018 Edition,” shall be referred to as the “International Residential
Code.” The appendices of the International Residential Code are not adopted
unless otherwise provided in this chapter.
(1) The following appendices of the International Residential Code are adopted by
reference and made a part of this code, subject to any amendments set forth in
this chapter:
(A) Appendix H, Patio Covers;
(B) Appendix M, Home Day Care – R-3 Occupancy; and
(C) Appendix Q, Tiny Houses.
(2) The following appendix is added to the International Residential Code and
made a part of this code, subject to any amendments set forth in this chapter:
Appendix U, Factory-built Housing.
(b) The scope, technical specifications, and exemptions set forth in the International
Residential Code are hereby adopted as the standard for building work covered by
this code, provided there are no specific provisions in any other section of this code
covering the particular matter.
(c) A copy of the International Residential Code shall be available for public inspection
at the Hilo and Kailua-Kona offices of the department of public works and at the
office of the County clerk.
(d) The International Residential Code adopted and incorporated by reference into this
code, shall be subject to the amendments hereinafter set forth.
(1) Chapter 1, “Scope and Administration,” of the International Residential Code
is deleted in its entirety.
(2) Chapter 1, Part 2 – “Administration and Enforcement” of the International
Residential Code is deleted in its entirety.
(3) Section R202, “Definitions,” of the International Residential Code is amended
by adding the following definitions:
“AUTHORITY HAVING JURISDICTION means the director of the
department of public works, or the director’s authorized
representative.”
“BUILDING, ENCLOSED is a building that does not comply with the
requirements for open or partially enclosed building.”
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§ 5B-2-1 H AWAI‘I C OUNTY C ODE
“BUILDING, OPEN is a building having each wall at least 80 percent
open. Ao >= Ag where:
1. Ao = total area of openings in a wall that receives positive
22
external pressure, in ft (m); and
2. Ag = the gross area of that wall in which Ao is identified, in
22
ft (m).”
“BUILDING, PARTIALLY ENCLOSED is a building that complies
with both of the following conditions:
1. The total area of openings in a wall that receives positive
external pressure exceeds that sum of the areas of openings
in the balance of the building envelope (walls and roof) by
more than 10 percent; and
2. The total area of openings in a wall that receives positive
external pressure exceeds 4 ft² (0.37 m²) or 1 percent of the
area of that wall, whichever is smaller, and the percentage of
openings in the balance of the building envelope does not
exceed 20 percent.
These conditions are expressed by the following equations:
1. Ao > 1.1 Aoi
2. Ao > 4 ft² (0.37 m²) or > 0.01 Ag, whichever is smaller, and
Where:
Ao, Aq are defined for open building.
Aoi = the sum of the areas of openings in the building
envelope (walls and roof) not including Ao, in ft² (m²).
Agi = the sum of the gross surface areas of the building
envelope (walls and roof) not including Ag, in ft² (m²).”
“CARPORT is a private garage which is at least 100 percent open on
one side and with 50 percent net openings on another side or which is
provided with an equivalent of such openings on two or more sides.
A private garage which is 100 percent open on one side and 25
percent open on another side with the latter opening so located to
provide adequate cross ventilation may be considered a carport when
approved by the building official. Carports not open on two or more
sides shall be considered to be a garage.”
“FAMILY shall be as defined in the Zoning Code except that a
nursing, care home, or other similar facility with not more than five
patients may be considered a family under this code.”
“FIRE CODE. The State Fire Code as adopted by the State Fire
Council.”
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“PRIVATE GARAGE or GARAGE. A building or portion of a building
in which motor vehicles used by the tenants of the building or
buildings on the premises are stored or kept, without provisions for
repairing or servicing such vehicles for profit.”
“SLEEPING UNIT. A single unit that provides rooms or spaces for one
or more persons, includes permanent provisions for sleeping and can
include provisions for living, eating, and either sanitation or kitchen
facilities but not both. Such rooms and spaces that are also part of a
dwelling unit are not sleeping units.”
(4) Section R202, “Definitions,” of the International Residential Code is amended
by amending the following definitions to read as follows:
“BUILDING. Any structure used or intended for supporting or
sheltering any use or occupancy. The term shall include but not be
limited to any structure mounted on wheels such as a trailer, wagon
or vehicle which is parked and stationary for any 24-hour period, and
is used for business or living purposes; provided, however, that the
term shall not include a push cart or push wagon which is readily
movable and which does not exceed 25 square feet in area, nor shall
the term include a trailer or vehicle, used exclusively for the purpose
of selling any commercial product therefrom, which hold a vehicle
license and actually travels on public or private streets.
To the extent context otherwise permits and/or requires, the
definitions of “building” as used in the following chapters of the
Hawai‘i County Code: 5A, the building code; 5B, the residential
building code; 5C, the existing building code; 5D, the electrical code;
5E, the energy conservation code; and 5F, the plumbing code; are
incorporated by reference herein.”
“BUILDING OFFICIAL. The director of the County department of
public works or the director’s authorized representative.”
(5) Subsection R301.1.1, “Alternative provisions,” of the International Residential
Code is amended to read as follows:
“R301.1.1 Alternative provisions. As an alternative to the
requirements in Section R301.1, the following standards are permitted
subject to the limitations of this code and the limitations therein.
Where engineered design is used in lieu of or in conjunction with these
standards, the design shall comply with the Building Code, Chapter
5A, Hawai‘i County Code.
1. AWC Wood Frame Construction Manual (WFCM) 2018.
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§ 5B-2-1 H AWAI‘I C OUNTY C ODE
2. AISI Standard for Cold-Formed Steel Framing—Prescriptive
Method for One- and Two-Family Dwellings (AISI S230 -
2015).
3. ICC Standard for Residential Construction in High-Wind
Regions (ICC 600-14).”
(6) Subsection R301.1.3, “Engineered design,” of the International Residential
Code is amended to read as follows:
“R301.1.3 Engineered design. When a building of otherwise
conventional construction contains structural elements exceeding the
limits of Section R301 or otherwise not conforming to this code, these
elements shall be designed in accordance with accepted engineering
practice using the Alternative Provisions listed in R301.1.1. The
extent of such design need only demonstrate compliance of
nonconventional elements with other applicable provisions and shall
be compatible with the performance of the conventional framed
system. Engineered design in accordance with the Building Code,
Chapter 5A, Hawai‘i County Code, is permitted for all buildings and
structures, and parts thereof, included in the scope of this code.”
(7) Section R301, “Design Criteria,” of the International Residential Code is
amended by adding subsection 301.1.4, “Complete load path and uplift ties,” to
read as follows:
“R301.1.4 Complete load path and uplift ties. Blocking, bridging,
straps, approved framing anchors, or mechanical fasteners shall be
designed and installed to provide continuous ties from the roof to the
foundation system.
Sheet metal clamps, ties, or clips, must be formed of galvanized steel
or other approved corrosion-resistant material not less than 0.040 inch
(1.01 mm) nominal thickness. Uplift resistance shall be in accordance
with Table R802.11.”
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R ESIDENTIAL B UILDING C ODE §5B-2-1
(8) Table R301.2(1), “Climatic and Geographic Design Criteria,” of the
International Residential Code is deleted in its entirety and replaced with the
following:
“TABLE R301.2(1)
CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA
WIND SEISMIC
SUBJECT TO DAMAGE FROM
FLOOD
SPEED DESIGN
HAZARDS
Weathering Termite Decay
(mph) CATEGORY
Per FEMA or
Very Moderate
Figure D2 or E NegligibleChapter 27
Heavyto severe
R301.2(8) HCC”
(9) Subsection 301.2.1, “Wind design criteria,” of the International Residential
Code is amended to read as follows:
“R301.2.1 Wind design criteria. Buildings and portions thereof
shall be constructed in accordance with the wind provisions of this
, as
code provided that the ultimate design wind speed, V
ULT
determined from Figure R301.2(5)A, is less than 130 mph, unless the
building is a single-story with a slab-on-grade foundation and in wind
exposure category B, then wind provisions of this code shall be
applicable when V is less than 140 mph. The structural provisions
ULT
of this code for wind loads are not permitted where wind design is
, determined from Figure R301.2(5)(A), is equal to
required when V
ULT
or greater than 130 mph, unless the building is a single-story with a
slab-on-grade foundation and in wind exposure category B, then
structural provisions of this code for wind loads are not permitted
where wind design is required when V is equal to or greater than
ULT
140 mph. Where different construction methods and structural
materials are used for various portions of a building, the applicable
requirements of this section for each portion shall apply. Where not
otherwise specified, the wind loads listed in Table R301.2(2) adjusted
for height and exposure using Table R301.2(3) shall be used to
determine design load performance requirements for wall coverings,
curtain walls, roof coverings, exterior windows, skylights, garage
doors and exterior doors. Asphalt shingles shall be designed for wind
speeds in accordance with Section R905.2.4. A continuous load path
shall be provided to transmit the applicable uplift forces in Section
R802.11.1 from the roof assembly to the foundation. The ultimate
design wind speed, V, in the State Residential Code is equal to the
ULT
basic design wind speed, V, in the Building Code, Chapter 5A, Hawai‘i
County Code.
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(10) Subsection R301.2.1.1, “Wind limitations and wind design required,” of the
International Residential Code is amended to read as follows:
“R301.2.1.1 Wind limitations and wind design required. The
wind provisions of this code shall not apply to the design of buildings
where wind design is required in accordance with Subsection
R301.2.1.
Exceptions:
1. For concrete construction, the wind provisions of this code
shall apply in accordance with the limitations of Sections
R404 and R608.
2. For structural insulated panels, the wind provisions of this
code shall apply in accordance with the limitations of Section
R610.
3. For cold-formed steel light-frame construction, the wind
provisions of this code shall apply in accordance with the
limitations of Sections R505, R603 and R804.
In regions where wind design is required in accordance with
Subsection R301.2.1, the design of buildings for wind loads shall be in
accordance with one or more of the following methods:
1. AWC Wood Frame Construction Manual (WFCM) 2018.
2. ICC Standard for Residential Construction in High-Wind
Regions (ICC 600-14).
3. AISI Standard for Cold-Formed Steel Framing—Prescriptive
Method for One- and Two-Family Dwellings (AISI S230-
2015).
4. The Building Code, Chapter 5A, Hawai‘i County Code.
The elements of design not addressed by the methods in Items 1
through 4 shall be in accordance with the provisions of this code.
Where wind design is required and design is in accordance with the
methods in Items 1 through 3, the building must be provided with
opening protection for windborne debris. Options for opening
protection or alternatives to opening protection shall be in accordance
with the Building Code, Chapter 5A, Hawai‘i County Code.”
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(11) Subsection R301.2.1.2, “Protection of openings” of the International
Residential Code is amended to read as follows:
“R301.2.1.2 Protection of openings. Exterior glazing in buildings
located in windborne debris regions shall be protected from windborne
debris. Glazed opening protection for windborne debris shall meet the
requirements of the Large Missile Test of ASTM E1996 and ASTM
E1886 as modified in Section 301.2.1.2.1.
Exceptions:
1. Wood structural panels with a minimum thickness of 7/16
inch (11 mm) and a maximum panel span of 8 feet (2438 mm)
are permitted for opening protection in one- and two-story
buildings classified as Group R-3 or R-4 occupancy. Panels
shall be precut so that they are attached to the framing
surrounding the opening containing the product with the
glazed opening. Panels shall be predrilled as required for the
anchorage method and shall be secured with the attachment
hardware provided and anchors permanently installed on the
building. Attachment in accordance with Table R301.2.1.2
with corrosion-resistant attachment hardware provided and
anchors permanently installed on the building is permitted
for buildings with a mean roof height of 45 feet (13 728 mm)
or less, where the ultimate design wind speed, V is 180 mph
ult’
(290 kph) or less.
2. Glazing in accessory structures to the single family dwellings
including but not limited to greenhouses and minor storage
sheds.
3. Partially enclosed and open occupancy R-3 buildings shall be
permitted to be designed without unprotected openings
subject to the following requirements.
3.1. For each direction of wind, determination of enclosure
classification shall be based on the assumption that all
unprotected glazing on windward walls are openings
while glazing on the remaining walls and roof are intact
and are not assumed to be openings.
3.2. Partially enclosed and open occupancy R-3 buildings
without wind-borne debris protection shall also include a
residential safe room in accordance with Section 429,
Hawai‘i residential safe room, of the Building Code,
Chapter 5A, Hawai‘i County Code, or alternatively
provide an equivalently sized room structurally protected
by construction complying with Section 429.5, of the
Building Code, Chapter 5A, Hawai‘i County Code.”
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(12) Table R301.2.1.2, “Windborne debris protection fastening schedule for wood
structural panels,” of the International Residential Code is deleted in its
entirety and replaced with the following:
“TABLE R301.2.1.2
WINDBOURNE DEBRIS PROTECTION FASTENING
a,b,c,d
SCHEDULE FOR WOOD STRUCTURAL PANELS
Fastener Spacing
Fastener Type
Panel span 4 feet < Panel 6 feet < Panel
Span
No. 8 Wood screw based
16” 10” 8”
anchor with 2-inch embedment
length
No. 10 Wood screw based
16” 12” 9”
anchor with 2-inch embedment
length
1/4-inch lag screw based
16” 16” 16”
anchor with 2-inch embedment
length
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound = 4.448N = 0.454 kg, 1 mile per hour = 0.447 m/s = 1.609
km/h.
a. This table is based on a 175 mph ultimate design wind speed and a mean roof height of 45 feet.
b. Fasteners shall be installed at opposing ends of the wood structural panel. Fasteners shall be located
a minimum of 1 inch from the edge of the panel.
c. Anchors shall penetrate through the exterior wall covering with an embedment length of 2 inches
minimum into the building frame. Fasteners shall be located a minimum of 2-1/2 inches from the
edge of concrete block or concrete.
d. Where panels are attached to masonry or masonry/stucco, they shall be attached utilizing vibration-
resistant anchors having a minimum withdrawal capacity of 1,500 pounds.”
(13) Figure R301.2(5)(a) “Ultimate Design Wind Speeds” of the International
Residential Code is deleted in its entirety and replaced with Figure
R301.2(5)(a) County of Hawai‘i Ultimate Wind Speed, V, for Components
ULT
and Cladding, to read as follows:
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R ESIDENTIAL B UILDING C ODE §5B-2-1
Ultimate
Figure R301.2(5)(a)
County of Hawai‘i
, for Components and Cladding
Ultimate Wind Speed, V
ULT
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(14) Figure R301.2(5)(b) “Regions Where Wind Design is Required” of the
International Residential Code is deleted in its entirety and replaced with
Figure R301.2(5)(b) “County of Hawai‘i Ultimate Wind Debris Zone,” to read as
follows:
Figure R301.2(5)(b) County of Hawai‘i Ultimate Wind Debris Zone
Figure R301.2(5)(b)
County of Hawai‘i Ultimate Wind Debris Zone
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(15) Subsection R301.2.1.4, “Exposure category,” of the International Residential
Code is deleted in its entirety and replaced with the following:
“R301.2.1.4 Exposure Category. The exposure category shall be
determined from Figure R301.2.1.4(a) or using the provisions of
ASCE 7-10.”
(16) Section R301, “Design Criteria,” of the International Residential Code is
amended by adding Figure R301.2.1.4(a), “Exposure Category Zones for
Hawai‘i County,” to read as follows:
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Figure R301.2.1.4(a)
Exposure Category Zones for Hawai‘i County
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(17) Subsection R301.2.1.5, “Topographic wind effects,” of the International
Residential Code is deleted in its entirety and replaced with the following:
“R301.2.1.5 Topographic wind effects. Topographic wind speed
effects shall be considered in the design of the building. Buildings
designed using the ultimate wind speed as determined from Figures
R301.2(5)(a) and wind exposure categories determined in accordance
with section R301.2.1.4 shall be deemed to comply with this section.”
(18) Subsection R301.2.1.5.1, “Simplified topographic wind speed-up method,” of
the International Residential Code is deleted in its entirety.
(19) Section R301, “Design Criteria,” of the International Residential Code is
amended by adding Table R301.2(4), “Determination of Seismic Design
Category by Location-Site Class D,” to read as follows:
Table R301.2(4)
Determination of Seismic Design Category by Location-Site Class D
Seismic
Design
Location
Category
Hawai‘i : North and South Kohala, Hamakua, & North Hilo Districts D
2
All other Hawai‘i County Districts E
(20) Subsection R301.2.2.1, “Determination of seismic design category,” of the
International Residential Code is amended to read as follows:
“R301.2.2.1 Determination of seismic design category. Buildings
shall be assigned a seismic design category in accordance with Table
R301.2(4) or Figure R301.2(2).
(21) Subsection R301.2.2.1.1, “Alternate determination of seismic design category,”
of the International Residential Code is deleted in its entirety.
(22) Subsection R301.2.2.6, “Irregular buildings,” of the International Residential
Code is amended to read as follows:
“R301.2.2.6 Irregular buildings. “The seismic provisions of this
code shall not be used for structures, or portions thereof, located in
, D and D and considered to be
Seismic Design Categories D
012
irregular in accordance with this section. A building or portion of a
building shall be considered to be irregular where one or more of the
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conditions defined in Items 1 through 7 occur. Irregular structures, or
irregular portions of structures, shall be designed in accordance with
the Building Code, Chapter 5A, Hawai‘i County Code, to the extent
the irregular features affect the performance of the remaining
structural system. Where the forces associated with the irregularity
are resisted by a structural system designed in accordance with the
Building Code, Chapter 5A, Hawai‘i County Code, the remainder of
the building shall be permitted to be designed using the provisions of
this code.
1. Shear wall or braced wall offsets out of plane. Conditions
where exterior shear wall lines or braced wall panels are not in
one plane vertically from the foundation to the uppermost story in
which they are required see Figure R301.2.2.6(1).
Figure R301.2.2.6(1)
Braced Wall Panels Out of Plane
Exception: For wood light-frame construction, floors with
cantilevers or setbacks not exceeding four times the nominal
depth of the wood floor joists, see Figure R301.2.2.6(2), are
permitted to support braced wall panels that are out of plane
with braced wall panels below provided that all of the
following are satisfied:
1. Floor joists are nominal 2 inches by 10 inches (51 mm by
254 mm) or larger and spaced not more than 16 inches
(406 mm) on center.
2. The ratio of the back span to the cantilever is not less
than 2 to 1.
3. Floor joists at ends of braced wall panels are doubled.
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4. For wood-frame construction, a continuous rim joist is
connected to ends of cantilever joists. Where spliced, the
rim joists shall be spliced using a galvanized metal tie
not less than 0.058 inch (1.5 mm) (16 gage) and 1-1/2
inches (38 mm) wide fastened with six 16d nails on each
side of the splice; or a block of the same size as the rim
joist and of sufficient length to fit securely between the
joist space at which the splice occurs, fastened with eight
16d nails on each side of the splice.
5. Gravity loads carried at the end of cantilevered joists are
limited to uniform wall and roof loads and the reactions
from headers having a span of 8 feet (2438 mm) or less.
Figure R301.2.2.6(2)
Braced Wall Panels Supported by Cantilever or Setback
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2. Lateral support of roofs and floors. Conditions where a
section of floor or roof is not laterally supported by shear walls
or braced wall lines on all edges. See Figure R301.2.2.6(3).
Figure R301.2.2.6(3)
Floor or Roof Not Supported on all Edges
Exception: Portions of floors that do not support shear
walls, braced wall panels above, or roofs shall be permitted to
extend not more than 6 feet (1829 mm) beyond a shear wall
or braced wall line. See Figure R301.2.2.6(4).
Figure R301.2.2.6(4)
Roof or Floor Extension Beyond Braced Wall Line
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3. Shear wall or braced wall offsets in plane. Conditions where
the end of a braced wall panel occurs over an opening in the wall
below and extends more than 1 foot (305 mm) horizontally past
the edge of the opening. This provision is applicable to shear walls
and braced wall panels offset in plane and to braced wall panels
offset out of plane in accordance with the exception to Item 1. See
Figure R301.2.2.6(5).
Figure R301.2.2.6(5)
Braced Wall Panel Extension Over Opening
Exception: For wood light-frame wall construction, one end
of a braced wall panel shall be permitted to extend more than
1 foot (305 mm) over an opening not more than 8 feet (2438
mm) in width in the wall below provided that the opening
includes a header in accordance with all of the following:
1. The building width, loading condition and framing
member species limitations of Table R602.7(1) shall
apply.
2. The header is composed of:
2.1. Not less than one 2 x 12 or two 2 x 10 for an opening
not more than 4 feet (1219 mm) wide.
2.2. Not less than two 2 x 12 or three 2 x 10 for an
opening not more than 6 feet (1829 mm) in width.
2.3. Not less than three 2 x 12 or four 2 x 10 for an
opening not more than 8 feet (2438 mm) in width.
3. The entire length of the braced wall panel does not occur
over an opening in the wall below.
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4. Floor and roof opening. Conditions where an opening in a floor
or roof exceeds the lesser of 12 feet (3658 mm) or 50 percent of the
least floor or roof dimension. See Figure R301.2.2.6(6).
Figure R301.2.2.6(6)
Opening Limitations for Floor and Roof Diaphragms
5. Floor level offset. Conditions where portions of a floor level are
vertically offset. See Figure R301.2.2.6(7).
Exceptions:
1. Framing supported directly by continuous foundations at
the perimeter of the building.
2. For wood light-frame construction, floors shall be
permitted to be vertically offset where the floor framing
is lapped or tied together as required by Section
R502.6.1.
Figure R301.2.2.6(7)
Portions of Floor Level Offset Vertically
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6. Perpendicular shear wall and wall bracing. Conditions
where shear walls and braced wall lines do not occur in two
perpendicular directions. See Figure R301.2.2.6(8).
Figure R301.2.2.6(8)
Braced Wall Lines Not Perpendicular
7. Wall bracing in stories containing masonry or concrete
construction. Conditions where stories above grade plane are
partially or completely braced by wood wall framing in accordance
with Section R602 or cold-formed steel wall framing in accordance
with Section R603 include masonry or concrete construction.
Where this irregularity applies, the entire story shall be designed
in accordance with the Building Code, Chapter 5A, Hawai‘i
County Code.
Exceptions: Fireplaces, chimneys and masonry veneer in
accordance with this code.
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(23) Subsection R303.1, “Habitable rooms,” of the International Residential Code is
amended to read as follows:
“R303.1 Habitable rooms. All habitable rooms shall have an
aggregate glazing area of not less than 10 percent of the floor area of
such rooms. Natural ventilation shall be through windows, doors,
louvers, or other approved openings to the outdoor air. Such openings
shall be provided with ready access or shall otherwise be readily
controllable by the building occupants. Unless required otherwise by
the Energy Conservation Code, Chapter 5E, Hawai‘i County Code, the
minimum openable area to the outdoors shall be 5 percent of the floor
area being ventilated.
Exceptions:
1. The glazed areas need not be openable where the opening is
not required by section R310 and a whole-house mechanical
ventilation system is installed in accordance with Section
M1505.
2. The glazed areas need not be installed in rooms where
Exception 1 above is satisfied and artificial light is provided
that is capable of producing an average illumination of 6
footcandles (65 lux) over the area of the room at a height of 30
inches (762 mm) above the floor level.
3. Use of sunroom and patio covers, as defined in Section R202,
shall be permitted for natural ventilation if in excess of 65
percent of the exterior sunroom walls are open, or are
enclosed only by insect screening.”
(24) Subsection R303.3, “Bathrooms,” of the International Residential Code is
amended to read as follows:
“R303.3 Bathrooms. Bathrooms, water closet compartments, laundry
rooms, and other similar rooms shall be provided with natural
ventilation by means of openable exterior openings with an area not
less than one twentieth of the floor area of such rooms with a
minimum of 1 ½ square feet.”
Exception: The glazed areas shall not be required where artificial
light and a local exhaust system are provided. The minimum local
exhaust rates shall be determined in accordance with Section M1505.
Exhaust air from the space shall be exhausted directly to the
outdoors.”
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(25) Subsection R309.3, “Flood hazard areas,” of the International Residential Code
is amended to read as follows:
“R309.3 Flood hazard areas. Buildings located within areas of
special flood hazards pursuant to Chapter 27, Hawai‘i County Code,
shall be designed and constructed in accordance with Chapter 27,
Hawai‘i County Code.”
(26) Subsection R310.2.1, “Minimum opening area,” of the International
Residential Code is amended to read as follows:
“R310.2.1 Minimum opening area. Emergency and escape rescue
openings shall have a net clear opening of not less 5.7 square feet
2
(0.530 m). The net clear opening dimensions required by this section
shall be obtained by the normal operation of the emergency escape
and rescue opening from the inside. The net clear height of the
opening shall be not less than 24 inches (610 mm) and the net clear
width shall be not less than 20 inches (508 mm).
Exceptions:
1.Grade floor openings or below-grade openings shall have a net
2
).
clear opening area of not less than 5 square feet (0.465 m
2. Glass jalousie bladed windows may be used for emergency
escape or rescue.”
(27) Subsection R313.2, “One-and two-family dwellings automatic fire sprinkler
systems,” is amended to read as follows:
“An automatic residential fire sprinkler system shall be installed in
one- and two-family dwellings.
Exceptions:
1. An automatic residential fire sprinkler system shall not be
required for additions or alterations to existing buildings that
are not already provided with an automatic residential
sprinkler system.
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2. In accordance with section 46-19.8, Hawai‘i Revised Statutes,
“Fire sprinklers; residences,” until June 30, 2027 the
installation or retrofitting of automatic fire sprinklers or an
automatic fire sprinkler system shall not be required in:
2.1 Any new or existing detached one- or two-family dwelling
unit in a structure used only for residential purposes;
and
2.2 Nonresidential agricultural and aquacultural buildings
and structures located outside an urban area.
Provided that Exception 2 shall not apply to new homes that require a
variance from access road or firefighting water supply requirements.”
(28) Subsection R317.1, “Location required,” of the International Residential Code
is amended by amending the first paragraph of this subsection to read as
follows: (Paragraphs numbered 1 through 7 that follow this paragraph, shall
remain unchanged.)
“R317.1 Location required. Protection of wood and wood-based
products from decay shall be provided in the following locations by the
use of naturally durable wood as approved by the building official, or
wood that is preservative-treated in accordance with AWPA U1 for the
species, product, preservative and end use. Preservatives shall be
listed in Section 4 of AWPA U1.”
(29) Subsection R318.1, “Subterranean termite control methods,” of the
International Residential Code is amended to read as follows:
“R318.1 Subterranean termite control methods. Methods of
protection shall be one of items 1, 2 or 3 and one of items 4, 5, or 6.
1. Chemical termiticide, as provided in Section R318.2.
2. Termite-baiting system installed and maintained according to
the label.
3. Physical barriers, as provided in Section R318.3 and used in
locations as specified in Section R317.1.
4. Pressure-preservative-treated wood in accordance with
Section R317.1.
5. Cold-formed steel framing in accordance with Sections
R505.2.1 and R603.2.1.
6. Naturally durable termite-resistant wood as approved by the
building official.”
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(30) Subsection R318.4, “Foam plastic protection,” of the International Residential
Code is amended to read as follows:
“R318.4 Foam plastic protection. Extruded and expanded
polystyrene, polyisocyanurate and other foam plastics shall not be
installed on the exterior face or under interior or exterior foundation
walls or slab foundations located below grade. The clearance between
foam plastics installed above grade and exposed earth shall not be less
than 6 inches (152 mm).
Exception: On the interior side of basement walls.”
(31) Section R318, “Protection Against Subterranean Termites,” of the
International Residential Code is amended by adding Subsection R318.5,
“Water splash,” to read as follows:
“R318.5 Water splash. Where wood-frame walls and partitions are
covered on the interior with plaster, tile or similar materials and are
subject to water splash, the framing shall be protected with approved
waterproof paper.”
(32) Section R318, “Protection Against Subterranean Termites,” of the
International Residential Code is amended by adding Subsection R318.6, “Pipe
and other penetrations,” to read as follows:
“R318.6 Pipe and other penetrations. Insulations around
plumbing pipes shall not pass through ground floor slabs. Openings
around pipes or similar penetrations in a concrete or masonry slab,
which is in direct contact with earth, shall be filled with non-shrink
grout, or other approved physical barrier.”
(33) Subsection R320.1, “Scope,” of the International Residential Code is amended
to read as follows:
“R320.1 Scope. Where there are four or more dwelling units or
sleeping units in a single structure, the following provisions for Group
R-3 apply:
1. For construction of buildings or facilities of the State and
County governments, compliance with Section 103-50,
Hawai‘i Revised Statutes, administered by the Disability and
Communication Access Board, State of Hawai‘i.
2. Department of Justice’s Americans with Disabilities Act
Standards for Accessible Design.
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3. Housing and urban development recognized “safe harbors” for
compliance with the Fair Housing Acts design and construction
requirements.
4. Other pertinent laws relating with disabilities shall be
administered and enforced by agencies responsible for their
enforcement.
Prior to the issuance of a building permit, the owner (or the owner's
representative, professional architect, or engineer), shall submit a
statement that all requirements relating to accessibility for persons
with disabilities will be complied with.”
(34) Subsection R322.2, “Flood hazard areas (including A Zones),” of the
International Residential Code is amended to read as follows:
“R322.2 Flood hazard areas (including A Zones). Buildings
located within areas of special flood hazards pursuant to Chapter 27,
Hawai‘i County Code, shall be designed and constructed in accordance
with Chapter 27, Hawai‘i County Code.”
(35) Section R323, “Storm Shelters” of the International Residential Code, is
amended to read as follows:
“SECTION R323
HAWAI‘I RESIDENTIAL SAFE ROOMS
R323.1 General. This section applies to storm shelters where
constructed as separate detached buildings or where constructed as
safe rooms within buildings for the purpose of providing refuge from
storms that produce high winds, such as tornados and hurricanes. In
addition to other applicable requirements in this code, storm shelters
shall be constructed in accordance with ICC/NSSA-500 or Subsection
R323.2.
R323.2 Performance-based design criteria. The residential safe
room shall meet the minimum performance specifications of Sections
323.2.1 through 323.11.
R323.2.1 Intent and scope. The intent of the residential safe room
is to temporarily provide an enhanced protection area, fully enclosed
within a dwelling or within an accessory structure to a residence,
which is designed and constructed to withstand the wind pressures,
windborne debris impacts, and other requirements of this section.
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R323.2.2 Alternative standards.
1. Manufactured safe room designs subject to approval. A
manufactured safe room or safe room kit may be substituted if
documentation is submitted and approved by the building official.
The safe room shall be engineered, tested, and manufactured to
meet or exceed the criteria of this section.
2. FEMA in-residence shelter designs permitted. It shall be
permissible to build FEMA In-Residence Shelters of up to 64
square feet of floor area with walls up to 8 feet long that are built
in accordance with construction details of FEMA 320.
R323.3 Site criteria. Residential safe rooms shall not be constructed
within areas subject to stream flooding, coastal flooding or dam failure
inundation within any of the following areas:
1. FEMA Special Flood Hazard Areas (SFHA) subject to rainfall
runoff flooding or stream or flash flooding;
2. Coastal zones “V” or “A” identified in the Flood Insurance Rate
Map (FIRM) issued by FEMA for floodplain management
purposes, in which the flood hazard are tides, storm surge, waves,
tsunamis, or a combination of these hazards; or
3. Areas subject to dam failure inundation as determined by the
Department of Land and Natural Resources.
R323.4 Size of safe room. The safe room shall be designed to
provide a minimum of 15 square feet per person in a room which does
2
) of floor area.
not need to exceed 120 square feet (11 m
R323.5 Provisions for exiting. The safe room shall be equipped
with an inward-swinging interior door and an impact-protected
operable window or exterior door suitable for a means of alternative
exiting in an emergency.
R323.6 Design for dead, live, wind, rain, and impact loads.
R323.6.1 Structural integrity criteria.
1. The residential safe room shall be built with a complete structural
system and a complete load path for vertical and lateral loads
caused by gravity and wind.
2. The building that the residential safe room is in shall be assumed
to be destroyed by the storm and shall not be taken as offering
any protective shielding to the safe room enclosure.
3. The ceiling structure and wall shall be capable of supporting a
superimposed debris load of the full weight of any building floors
and roof above, but not less than 125 psf.
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4. The residential safe room enclosure shall be capable of
simultaneously resisting lateral and uplift wind pressures
corresponding to a 145 mph 3-second peak gust ultimate design
wind speed, determined in accordance with ASCE – 7, Minimum
Design Loads for Buildings and Other Structures. The site
exposure factor shall be based on exposure C or the exposure
shown in Figure R301.2.1.4(a), whichever is the greater. The
values for the gust factor and the directionality factor shall be
taken as 0.85. Topographic wind amplification caused by
mountainous terrain shall be considered in accordance with the
building code. Internal pressure shall be determined in
accordance with ASCE – 7.
5. The residential safe room shall be anchored to a foundation
system capable of resisting the above loading conditions.
R323.6.2 Windborne debris impact protection of building
enclosure elements. The entire enclosure of the safe room,
including all walls, ceilings, and openings, fixed or operable windows,
and all entry doors into the safe room, shall meet or exceed Level D
requirements of ASTM E 1996 (Table 323.6.1), or be an approved
assembly listed in Section 323.6.4. Any wall or ceiling penetration
greater than 4 square inches shall be considered an opening.
Exception: Electrical outlet boxes and interior lighting switches not
penetrating more than 2.5-inches into the interior wall surface and a
plumbing piping or conduit not greater than 1.5-inch in diameter shall
be exempted from this requirement.
R323.6.3 Cyclic pressure loading of glazing and protective
systems. Impact protective systems shall meet the ASTM E 1996
cyclic pressure requirement for the loading given in Table 323.6.1.
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Table 323.6.1
WINDBORNE DEBRIS PROTECTION AND CYCLIC PRESSURE
CRITERIA FOR RESIDENTIAL SAFE ROOMS
Enclosure Wall
Ceiling, and Floor
ASTM E
1996 Debris Cyclic Air Pressure
Debris Missile
Missile Impact Testing - maximum
Size
Level Speed inward and
Rating maximum outward
pressures
2 x 4 weighing 9.0
lb. +/- 0.25 lb., 50 ft./sec.
35 psf inward
D
and with min. or at least
45 psf outward
length 8 ft. 34 mph
+/- 4-inch
R323.6.2 Approved debris impact resistant wall assemblies.
The following methods of wall assembly construction shall be deemed
to comply with Section R323.6.2:
1. 3/4-inch plywood on wood studs spaced at 16 inches on-center
with #8 X 3 inch wood screws at 6 inches on-center.
2. 3/4-inch plywood attached to double studs spaced at 16 inches on-
center with #8 X 3 inch wood screws at 6 inches on-center.
3. 8-1/4 inch cementitious lap siding over 22 gage sheet metal
attached to 350S-162-33 studs spaced at 24 inches on-center.
4. 8-1/4 inch cementitious lap siding attached to 350S-162-33 studs
spaced at 24 inches on-center studs with interior 3/4-inch interior
plywood sheathing.
5. 8-1/4 inch cementitious lap siding attached to 350S-162-33 studs
spaced at 24 inches on-center with 1/2-inch interior 22 gage sheet
metal composite gypsum wallboard.
6. 8-1/4 inch cementitious lap siding attached to 2 inch X 4 inch
wood studs spaced at 16 inches on-center with 1/2-inch interior 22
gage sheet metal composite gypsum wallboard.
7. 8-1/4 inch cementitious lap siding attached to 2 inch X 4 inch
wood studs spaced at 16 inches on-center with 22 gage sheet
metal and 1/2-inch interior gypsum wallboard.
8. Cementitious lap siding attached to 5/8-inch structural plywood
on 2 inch X 4 inch wood studs spaced at 16 inches on-center.
9. Cementitious-panel siding attached to 5/8-inch structural plywood
on 2 inch X 4 inch or 362S-137-43 steel studs spaced at 16 inches
on-center.
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10. EFS with 1/2-inch dens-glass gold exterior sheathing on 362S-
137-43 steel studs spaced at 16 inches on-center and 1/2-inch
interior gypsum wallboard.
11. 24 gage steel sheet (50 ksi) on girts.
12. Concrete with a thickness of 4 inches with reinforcing.
13. Concrete masonry units with a thickness of 6 inches with partial
grouting and reinforcing spaced at 24 inches on-center.
14. Concrete masonry units with a thickness of 8 inches with partial
grouting and reinforcing spaced at 24 inches on-center.
15. Interior or exterior wall with laterally braced 2 inch x 4 inch wood
studs with sheathing on either side of 22 gage sheet metal.
Sheathing shall be attached to studs with fasteners at 6 inches
(152 mm) on center for edge and field fastening.
R323.7 Ventilation. The residential safe room shall be naturally
ventilated to allow the enclosure to have approximately one air change
every two hours. This requirement may be satisfied by 12 square
inches of venting per occupant. There shall be at least two operable
vents. The vents shall be protected by a cowling or other device that
shall be impact tested to comply with ASTM E 1996-14 Level D.
Alternatively, the room shall be evaluated to determine if the
openings are of sufficient area to constitute an open or partially
enclosed condition as defined in ASCE 7.
R323.8 Communications. The residential safe room shall be
equipped with a phone line and telephone that does not rely on a
separate electrical power outlet. Alternatively, a wireless telephone
shall be permitted to rely on an Uninterruptible Power Supply (UPS)
battery device.
R323.9 Construction documents. Construction documents for the
residential safe room shall be directly prepared by a Hawai‘i licensed
professional structural engineer.
R323.10 Special inspection. The construction or installation of the
residential safe room shall be verified for conformance to the drawings
in accordance with the appropriate requirements of Chapter 17 of the
International Building Code.
R323.11 Notification. The owner of the safe room shall notify the
State Department of Defense and County Civil Defense Agency of the
property’s Tax Map Key or Global Positioning System coordinates.”
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(36) Section R326, “Swimming Pools, Spas and Hot Tubs” of the International
Residential Code, is amended to read as follows:
“R326.1 General. Swimming pools shall comply with the
requirements of sections R326.2 through R326.4 and other applicable
sections of this code.
R326.2. Definition. “SWIMMING POOL” shall, for the purposes of
this section, have the following meaning: “Any structure intended for
swimming, recreational bathing or wading that contains water over 24
inches (610 mm) deep. This includes in-ground, above-ground and on-
ground pools; hot tubs; spas and fixed-in-place wading pools.”
R326.3 Residential swimming pools. Residential swimming pools
shall comply with Sections R326.3.1 through R326.3.4.
Exception: A swimming pool with a power safety cover or a spa with
a safety cover complying with ASTM F 1346 need not comply with
Section R326.3.
R326.3.1 Barrier height and clearances. The top of the barrier
shall be at least 48 inches (1219 mm) above grade measured on the
side of the barrier that faces away from the swimming pool. The
vertical clearance between grade and the bottom of the barrier shall
be not greater than 2 inches (51 mm) measured on the side of the
barrier that faces away from the swimming pool. Where the top of the
pool structure is above grade, the barrier is authorized to be at ground
level or mounted on top of the pool structure, and the vertical
clearance between the top of the pool structure and the bottom of the
barrier shall be not greater than 4 inches (102 mm).
R326.3.1.1 Openings. Openings in the barrier shall not allow
passage of a 4-inch-diameter (102 mm) sphere.
R326.3.1.2 Solid barrier surfaces. Solid barriers which do not have
openings shall not contain indentations or protrusions except for
normal construction tolerances and tooled masonry joints.
R326.3.1.3 Closely spaced horizontal members. Where the barrier
is composed of horizontal and vertical members and the distance
between the tops of the horizontal members is less than 45 inches
(1143 mm), the horizontal members shall be located on the swimming
pool side of the fence. Spacing between vertical members shall be not
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greater than 1.75 inches (44 mm) in width. Where there are decorative
cutouts within vertical members, spacing within the cutouts shall be
not greater than 1.75 inches (44 mm) in width.
R326.3.1.4 Widely spaced horizontal members. Where the barrier
is composed of horizontal and vertical members and the distance
between the tops of the horizontal members is 45 inches (1143 mm) or
more, spacing between vertical members shall be not greater than 4
inches (102 mm). Where there are decorative cutouts within vertical
members, spacing within the cutouts shall be not greater than 1.75
inches (44 mm) in width.
R326.3.1.5 Chain link dimensions. Mesh size for chain link fences
shall be not greater than a 2.25 inch square (57 mm square) unless the
fence is provided with slats fastened at the top or the bottom which
reduce the openings to not more than 1.75 inches (44 mm).
R326.3.1.6 Diagonal members. Where the barrier is composed of
diagonal members, the opening formed by the diagonal members shall
be not greater than 1.75 inches (44 mm).
R326.3.1.7 Gates. Access doors or gates shall comply with the
requirements of Sections R326.3.1.1 through R326.3.1.6 and shall be
equipped to accommodate a locking device. Pedestrian access gates
shall open outward away from the pool and shall be self-closing and
have a self-latching device. Gates other than pedestrian access gates
shall have a self-latching device. Where the release mechanism of the
self-latching device is located less than 54 inches (1372 mm) from the
bottom of the door or gate, the release mechanism shall be located on
the pool side of the door or gate at least 3 inches (76 mm) or more,
below the top of the door or gate, and the door or gate and barrier
shall be without openings greater than 0.5 inch (12.7 mm) within 18
inches (457 mm) of the release mechanism.
R326.3.1.8 Dwelling wall as a barrier. Where a wall of a dwelling
serves as part of the barrier, one of the following shall apply:
1. Doors with direct access to the pool through that wall shall be
equipped with an alarm that produces an audible warning when
the door and/or its screen, if present, are opened. The alarm shall
be listed in accordance with UL 2017. The audible alarm shall
activate within 7 seconds and sound continuously for a minimum
of 30 seconds after the door and/or its screen, if present, are
opened and be capable of being heard throughout the house
during normal household activities. The alarm shall
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automatically reset under all conditions. The alarm shall be
equipped with a manual means, such as touchpad or switch, to
temporarily deactivate the alarm for a single opening. Such
deactivation shall last for not more than 15 seconds. In dwellings
not required to be Accessible, Type A or Type B units, the
deactivation switch shall be located 54 inches (1372 mm) or more
above the threshold of the door. In dwellings required to be
Accessible, Type A or Type B units, the deactivation switch shall
be located not higher than 54 inches (1372 mm) and not less than
48 inches (1219 mm) above the threshold of the door.
2. The pool shall be equipped with a power safety cover that
complies with ASTM F 1346.
3. Other means of protection, such as self-closing doors with self-
latching devices, which are approved, shall be accepted so long as
the degree of protection afforded is not less than the protection
afforded by Section R326.3.1.8, Item 1 or 2.
R326.3.1.9 Pool structure as barrier. Where an aboveground pool
structure is used as a barrier or where the barrier is mounted on top
of the pool structure, and the means of access is a ladder or steps, then
the ladder or steps either shall be capable of being secured, locked or
removed to prevent access, or the ladder or steps shall be surrounded
by a barrier which meets the requirements of Sections R326.3.1.1
through R326.3.1.8. When the ladder or steps are secured, locked or
removed, any opening created shall not allow the passage of a 4-inch
diameter (102 mm) sphere.
R326.3.2 Indoor swimming pools. Walls surrounding indoor
swimming pools shall not be required to comply with Section
R326.3.1.8.
R326.3.3 Prohibited locations. Barriers shall be located so as to
prohibit permanent structures, equipment or similar objects from
being used to climb the barriers.
R326.4 Entrapment avoidance. Suction outlets shall be designed
and installed in accordance with ANSI/APSP-7.”
(37) Section R401, “General,” of the International Residential Code, is amended by
adding subsection R401.5, “Post or pier foundations,” to read as follows:
“R401.5 Post or pier foundations. Raised floor systems supported
by post or pier foundations shall be designed in accordance with the
Building Code, Chapter 5A, Hawai‘i County Code.”
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(38) Subsection R402.2.1, “Materials for concrete,” of the International Residential
Code is amended to read as follows:
“R402.2.1 Materials for concrete. Materials for concrete shall
comply with the requirements of Section R608.5.1. The maximum
water to cement ratio for concrete slabs-on-grade shall not exceed
0.50.”
(39) Section R403, “Footings,” of the International Residential Code is amended by
adding subsection R403.1.6.2, “Concrete strap type anchors,” to read as
follows:
“R403.1.6.2 Concrete strap-type anchors. Concrete strap-type
anchors made out of cold-formed steel shall not be used along the
perimeter edges of a slab-on-grade where the steel does not have at
least 1-1/2 inches side cover or other adequate protection.”
(40) Section R403, “Footings,” of the International Residential Code is amended by
adding subsection R403.1.6.3, “Anchor bolts at the perimeter edge of a slab on
grade,” to read as follows:
“R403.1.6.3 Anchor bolts at the perimeter edge of a slab-on-
grade. Anchor bolts must be hot dipped galvanized in accordance
with ASTM F2329 and have a minimum concrete side cover of 1-1/2
inches unless provisions have been made to protect the anchor bolts
from corrosion.”
(41) Subsection R406.1, “Concrete and masonry foundation dampproofing,” of the
International Residential Code is deleted in its entirety.
(42) Subsection R406.2, “Concrete and masonry foundation waterproofing,” of the
International Residential Code is amended to read as follows:
“R406.2 Concrete and masonry foundation waterproofing.
Exterior foundation walls that retain earth and enclose interior spaces
and floors below grade shall be waterproofed from the top of the
footing to the finished grade. Walls shall be waterproofed in
accordance with one of the following:
1. Two-ply hot-mopped felts.
2. Fifty-five-pound (25 kg) roll roofing.
3. Forty-mil (1 mm) polymer-modified asphalt.
4. Sixty-mil (1.5 mm) flexible polymer cement.
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5. One-eighth-inch (3 mm) cement-based, fiber-reinforced,
waterproof coating.
6. Sixty-mil (1.5 mm) solvent-free liquid-applied synthetic rubber.
All joints in membrane waterproofing shall be lapped and sealed with
an adhesive compatible with the membrane.
Exception: Organic-solvent-based products such as hydrocarbons,
chlorinated hydrocarbons, ketones and esters shall not be used for ICF
walls with expanded polystyrene form material. Use of plastic roofing
cements, acrylic coatings, latex coatings, mortars and pargings to seal
ICF walls is permitted. Cold-setting asphalt or hot asphalt shall
conform to type C of ASTM D 449. Hot asphalt shall be applied at a
temperature of less than 200°F (93°C).”
(43) Subsection R406.3, “Dampproofing for wood foundations,” of the International
Residential Code is amended to read as follows:
“R406.3 Waterproofing for wood foundations. Wood foundations
enclosing habitable or usable spaces located below grade shall be
waterproofed in accordance with Section R406.2.”
(44) Subsection R406.3.2, “Below-grade moisture barrier,” of the International
Residential Code is amended to read as follows:
“R406.3.2 Below-grade waterproofing. One of the waterproofing
systems listed in R406.2 shall be applied over the below-grade portion
of exterior foundation walls prior to backfilling. The top edge of the
waterproofing shall be bonded to the sheathing to form a seal. Film
areas at grade level shall be protected from mechanical damage and
exposure by a pressure-preservative treated lumber or plywood strip
attached to the wall several inches above finished grade level and
extending approximately 9 inches (229 mm) below grade. The joint
between the strip and the wall shall be caulked full length prior to
fastening the strip to the wall. Other coverings appropriate to the
architectural treatment may also be used. The waterproofing shall
extend down to the bottom of the wood footing plate but shall not
overlap or extend into the gravel or crushed stone footing.”
(45) Subsection R406.4, “Precast concrete foundation system dampproofing,” of the
International Residential Code is deleted in its entirety.
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(46) Section R406, “Foundation Waterproofing and Damp-proofing,” of the
International Residential Code is amended by adding subsection R406.5, “Cold
formed steel protection of sill track,” to read as follows:
“R406.5 Cold formed steel protection of sill track. Cold formed
steel framing sills that directly bear on concrete or masonry that is in
direct contact with earth shall be shielded along the exterior flange
and bottom of the sill track with a self-adhered rubberized asphalt
flashing material with a minimum thickness of 25 mil (0.64 mm) or
other moisture barrier conforming to ASTM D412, D570, and
E96/E96M.”
(47) Section R408, “Under-Floor Space,” of the International Residential Code is
amended by adding subsection R408.8, “Under-floor clearance,” to read as
follows:
“R408.8 Under-Floor Clearance. Minimum clearance between the
bottom of floor joists or bottom of floors without joists and the ground
beneath is 24 inches (610 mm); the minimum clearance between the
bottom of girders and the ground is 18 inches (457 mm).
Exception: Open slat wood decks must have ground clearance of at
least 6 inches (152 mm) for any wood member.”
(48) Subsection R602.10.9, “Braced wall panel support,” of the International
Residential Code shall be amended to read as follows:
“R602.10.9 Braced wall panel support. Braced wall panel support
shall be provided as follows:
1. Cantilevered floor joists complying with Section R502.3.3 shall be
permitted to support braced wall panels.
2. Raised floor system post or pier foundations supporting braced
wall panels shall be designed in accordance with the Building
Code, Chapter 5A, Hawai‘i County Code.
3. Masonry stem walls with a length of 48 inches (1219 mm) or less
supporting braced wall panels shall be reinforced in accordance
with Figure R602.10.9. Masonry stem walls with a length greater
than 48 inches (1219 mm) supporting braced wall panels shall be
constructed in accordance with Section R403.1 Methods ABW and
PFH shall not be permitted to attach to masonry stem walls.
4. Concrete stem walls with a length of 48 inches (1219 mm) or less,
greater than 12 inches (305 mm) tall and less than 6 inches (152
mm) thick shall have reinforcement sized and located in
accordance with Figure R602.10.9.”
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(49) Subsection R806.1, “Ventilation required,” of the International Residential
Code is amended to read as follows:
“R806.1 Ventilation required. Enclosed attics and enclosed rafter
spaces formed where ceilings are applied directly to the underside of
roof rafters shall have cross ventilation for each separate space by
ventilating openings protected against the entrance of rain or snow.
Ventilation openings shall have a least dimension of 1/16 inch (1.6
mm) minimum and 1/4 inch (6.4 mm) maximum. Ventilation openings
having a least dimension larger than 1/4 inch (6.4 mm) shall be
provided with corrosion-resistant wire cloth screening, hardware
cloth, perforated vinyl or similar material with openings having a
least dimension of 1/16 inch (1.6 mm) minimum and 1/4 inch (6.4 mm)
maximum. Openings in roof framing members shall conform to the
requirements of Section R802.7. Required ventilation openings shall
open directly to the outside air and shall be protected to prevent the
entry of birds, rodents, snakes and other similar creatures.
Exception: The attic space shall be permitted to be unvented when
the design professional determines it would be beneficial to eliminate
ventilation openings to reduce salt-laden air and maintain relative
humidity 60 percent or lower to:
1. Avoid corrosion to steel components;
2. Avoid moisture condensation in the attic space; or
3. Minimize energy consumption for air conditioning or
ventilation by maintaining satisfactory space conditions in
both the attic and occupied space below.”
(50) Chapter 11, “Energy Efficiency,” of the International Residential Code is
deleted in its entirety. Refer to the Energy Conservation Code, Chapter 5E,
Hawai‘i County Code.
(51) Subsection M1301.1, “Scope,” of the International Residential Code shall be
amended to read as follows:
“M1301.1 Scope. The provisions of this chapter shall govern the
installation of mechanical systems not specifically covered in other
chapters applicable to mechanical systems. Installations of mechanical
appliances, equipment and systems not addressed by this code shall
comply with the applicable provisions of nationally published codes or
standards and with the Plumbing Code, Chapter 5F, Hawai‘i County
Code.
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§ 5B-2-1 H AWAI‘I C OUNTY C ODE
(52) Subsection M1307.4.2, “Mechanical ventilation,” of the International
Residential Code shall be amended to read as follows:
“M1307.4.2 Mechanical ventilation. Indoor locations intended for
hydrogen-generating or refueling operations shall be ventilated in
accordance with the applicable provisions of nationally published
mechanical codes or standards.”
(53) Subsection M1901.1, “Clearances,” of the International Residential Code shall
be amended to read as follows:
“M1901.1 Clearances. Freestanding or built-in ranges shall have a
vertical clearance above the cooking top of not less than 30 inches (762
mm) to unprotected combustible material. Reduced clearances are
permitted in accordance with the listing and labeling of the range
hoods or ovens with integral exhaust. The clearances for a domestic
open-top broiler unit shall be in accordance with Section M1503.2.1.
Minimum Horizontal Clearance. The minimum horizontal
clearance from edge of the burner head(s) of top (or surface) cooking
unit to combustible walls extending above the cooking surface shall be
not less than 12 inches.
Exception: Walls of combustible materials to be installed within 12
inches of a cooking unit shall be provided with protection equivalent to
1/2-inch gypsum wallboard covered with laminated plastic. The
height of the laminated plastic shall be 12 inch minimum.”
(54) Chapter 20, “Boilers and Water Heaters,” of the International Residential
Code is deleted in its entirety and replaced with provisions relating to water
heaters in the Plumbing code, Chapter 5F, Hawai‘i County Code.
(55) Chapter 21, “Hydronic Piping,” of the International Residential Code is
amended by amending its title to read as follows:
“CHAPTER 21
HYDRONIC PIPING
(FOR REFERENCE ONLY)”
(56) Chapter 21, “Hydronic Piping,” of the International Residential Code is
amended by adding a section M2100, “Reference,” to read as follows:
“Section M2100 Reference. The provisions of this chapter shall be
deemed to be guidelines only and not mandatory.”
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(57) Chapter 22, “Special Piping and Storage Systems,” of the International
Residential Code is amended by amending its title to read as follows:
“CHAPTER 22
SPECIAL PIPING AND STORAGE SYSTEMS
(FOR REFERENCE ONLY)”
(58) Chapter 22, “Special Piping and Storage Systems,” of the International
Residential Code is amended by adding a section M2200, “Reference,” to read
as follows:
“Section M2200 Reference. The provisions of this chapter shall be
deemed to be guidelines only and not mandatory.”
(59) Chapter 23, “Solar Thermal Energy Systems,” of the International Residential
Code is deleted in its entirety. Refer to the Electrical Code, Chapter 5D,
Hawai‘i County Code and the Plumbing Code, Chapter 5F, Hawai‘i County
Code.
(60) Chapter 24, “Fuel Gas,” of the International Residential Code is deleted in its
entirety. Refer to the Plumbing Code, Chapter 5F, Hawai‘i County Code.
(61) Chapters 25 through 32 that are contained in Part VII, “Plumbing,” of the
International Residential Code are deleted in their entirety. Refer to the
Plumbing Code, Chapter 5F, Hawai‘i County Code.
(62) Chapter 33, “Storm Drainage,” of the International Residential Code is deleted
in its entirety.
(63) Chapters 34 thru 43 that are contained in Part VIII, “Electrical,” of the
International Residential Code are deleted in their entirety. Refer to the
Electrical Code, Chapter 5D, Hawai‘i County Code.
(2021, ord 21-61, sec 1; am 2024, ord 24-17, sec 1.) 5B-2-1
Article 3. Adoption, Amendment, and Addition of Appendices.
Division 1. Appendices of International Residential Code Adopted.
Section 5B-3-1. Appendices not applicable.
Provisions in the appendices of the International Residential Code shall not apply
unless specifically adopted.
(2021, ord 21-61, sec 1.) 5B-3-1
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Section 5B-3-2. Appendices of the International Residential Code adopted.
The following appendices of the International Residential Code are adopted by
reference and made a part of this code, subject to any amendments set forth in this
article:
(1) Appendix H, Patio Covers;
(2) Appendix M, Home Day Care – R-3 Occupancy; and
(3) Appendix Q, Tiny Houses.
(2021, ord 21-61, sec 1.) 5B-3-2
Section 5B-3-3. Appendix Q; Tiny Houses.
Appendix Q is deleted in its entirety and replaced with the following:
“APPENDIX Q
TINY HOUSES
SECTION AQ101
GENERAL
AQ101.1 Scope. This appendix shall be applicable to tiny houses used
as single dwelling units and tiny houses that contain a loft. Tiny
houses shall comply with the International Residential Code except as
otherwise stated in this appendix.
AQ101.1.1 Limitations. Tiny houses shall not contain more than one
loft, or loft space. Tiny houses that contain a loft may not be used for
any purpose other than as a detached single-family dwelling.
SECTION AQ102
DEFINITIONS
AQ102.1 General. The following words and terms shall, for the
purposes of this appendix, have the meanings shown herein. Refer to
Chapter 2 of the International Residential Code for general
definitions.
EGRESS ROOF ACCESS WINDOW. A skylight or roof window
designed and installed to satisfy the emergency escape and rescue
opening requirements in Section R310.2.
LANDING PLATFORM. A landing measuring two treads deep and
two risers tall, provided as the top step of a stairway accessing a loft.
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LOFT. Any floor level located above the main floor and open to it on at
least one side, with a ceiling height less than 6 feet 8 inches (2032
mm), complying with the area, access, and guard requirements of
Section AQ105, and used as a living or sleeping space.
2
TINY HOUSE. A dwelling which is 500 square feet (37 m) or less in
floor area excluding lofts. The maximum total floor area of 500 square
feet shall mean the sum of the horizontal areas of each floor of a
building measured from the exterior faces of the exterior walls. The
total floor area shall include enclosed attached accessory structures
such as garages or storage areas. Unenclosed attached structures
such as carports, breezeways, lanais, or porches shall be excluded.
SECTION AQ103
FOUNDATIONS
AQ103.1 General. All exterior walls shall be permanently supported
on continuous solid or fully grouted masonry or concrete footings,
crushed stone footings, wood foundations, or other approved structural
systems pursuant to Chapter 4 of the International Residential Code,
which shall be of sufficient design to accommodate all loads according
to Section R301 and to transmit the resulting loads to the soil within
the limitations as determined from the character of the soil. Footings
shall be supported on undisturbed natural soils or engineered fill.
SECTION AQ104
CEILING HEIGHT
AQ104.1 Minimum ceiling height. Habitable space and hallways in
tiny houses shall have a ceiling height not less than 6 feet 8 inches
(2032 mm). Bathrooms, toilet rooms, and kitchens shall have a ceiling
height not less than 6 feet 4 inches (1930 mm). No obstructions shall
extend below these minimum ceiling heights including beams, girders,
ducts, lighting, or other obstructions.
Exception: Ceiling heights in lofts are permitted to be less than 6 foot
8 inches (2032 mm).
SECTION AQ105
LOFTS
AQ105.1 Minimum loft areas. Lofts used as a sleeping or living
space shall meet the minimum area and dimension requirements of
Sections AQ105.1.1 through AQ105.1.3.
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AQ105.1.1 Minimum area. Lofts shall have a floor area of not less
2
than 35 square feet (3.25 m).
AQ105.1.2 Minimum dimensions. Lofts shall be not less than 5 feet
(1524 mm) in any horizontal dimension.
AQ105.1.3 Height effect on loft area. Portions of a loft with a
sloping ceiling measuring less than 3 feet (914 mm) from the finished
floor to the finished ceiling shall not be considered as contributing to
the minimum required area for the loft.
Exception: Under gable roofs with a minimum slope of 6:12, portions
of a loft with a sloping ceiling measuring less than 16 inches (406 mm)
from the finished floor to the finished ceiling shall not be considered as
contributing to the minimum required area for the loft.
AQ105.1.4 Minimum ceiling height. Lofts shall have a ceiling
height of not less than 3 feet (914.4 mm).
AQ105.1.4.4.1 Undersized lofts. Lofts having a ceiling height of less
than 6 feet (1828.8 mm) for more than 50 percent of the required
minimum area shall comply with both of the following:
1. All wall and ceiling of the dwelling unit shall be a minimum
1/2 inch gypsum board or other approved Class A finish,
throughout the entire dwelling unit.
2. In addition to the loft smoke alarm required by AQ105.4, all
other required smoke alarms within the dwelling unit shall
be a photoelectric-type complying with R314.
AQ105.1.5 Maximum loft size. The aggregate floor area of a loft
shall not be greater than one-third of the floor area of the room or
space in which they are located.
AQ105.2 Loft access. The access to and primary egress from lofts
shall be of any type described in Sections AQ105.2.1 through
AQ105.2.4. All methods of loft access and egress shall be positively
anchored to prevent displacement.
AQ105.2.1 Stairways. Stairways accessing lofts shall comply with
this code or with Sections AQ105.2.1.1 through AQ105.2.1.5.
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AQ105.2.1.1 Width. Stairways accessing a loft shall not be less than
17 inches (432 mm) in clear width at all points at or above the
permitted handrail height. The minimum width below the handrail
shall not be less than 20 inches (508 mm).
AQ105.2.1.2 Headroom. The headroom in stairways accessing a loft
shall not be less than 6 feet 2 inches (1880 mm) measured vertically
from the sloped line connecting the tread nosing in the middle of the
tread width.
Exception: The headroom for landing platforms shall not be less than
4 feet 6 inches (1372 mm).
AQ105.2.1.3 Treads and Risers. Risers for stairs accessing a loft
shall be a minimum of 7 inches (178 mm) and a maximum of 12 inches
(305 mm). Tread depth and riser height shall be calculated with the
following formulas:
Tread depth = 20 inches (508 mm) minus 4/3 riser height
or
Riser height = 15 inches (381 mm) minus 3/4 tread depth
Exception: Landing platforms shall measure two treads deep and
two risers tall.
AQ105.2.1.4 Handrails. Handrails shall comply with Section
R311.7.8.
AQ105.2.1.5 Stairway guards. Guards at open sides of stairways
shall comply with Section R312.1.
AQ105.2.2 Ladders. Ladders accessing lofts shall comply with
Sections AQ105.2.2.1 and AQ105.2.2.2.
AQ105.2.2.1 Size and capacity. Ladders accessing lofts shall have
12 inches (305 mm) minimum rung width and 10 inches (254 mm) to
14 inch (356 mm) spacing between rungs. Ladders shall be capable of
supporting a 300 pound (136 kg) load on any rung. Rung spacing shall
be uniform within 3/8-inch (9.5 mm). The maximum height of a ladder
shall be 8 feet (2438 mm).
AQ105.2.2.2 Incline. Ladders shall be installed at 70 to 80 degrees
from horizontal.
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AQ105.2.3 Alternating tread devices. Alternating tread devices
accessing lofts 200 square feet or less shall comply with Sections
R311.7.11.1 and R311.7.11.2. The clear width at and below the
handrails shall be not less than 20 inches (508 mm).
AQ105.2.4 Ships ladders. Ships ladders accessing lofts 200 square
feet or less shall comply with Sections R311.7.12.1 and R311.7.12.2.
The clear width at and below the handrails shall be not less than 20
inches (508 mm).
AQ105.3 Loft guards. Loft guards shall be located along the open
side(s) of lofts located more than 30 inches (762 mm) above the main
floor. Loft guards shall be not less than 36 inches (914 mm) in height
or one-half the clear height to the ceiling, whichever is less. Loft
guards are not required at the loft accessing means connection to the
loft.
AQ105.4 Loft smoke alarms. Lofts shall be equipped with a
minimum of one photoelectric-type smoke alarm complying with
Section R314.
AQ105.5 Loft location. Lofts shall not be located directly above a
permanently installed cooking appliance. Permanently installed
cooking appliances shall not be located within 12 inches (304.8 mm)
horizontally of a loft open edge, measured to the vertical plane of the
loft edge.
SECTION AQ106
EMERGENCY ESCAPE AND RESCUE OPENINGS
AQ106.1 General. Tiny houses shall meet the requirements of
Section R310 for emergency escape and rescue openings.
Exception: Egress roof access windows in lofts used as sleeping rooms
shall be deemed to meet the requirements of Section R310 where
installed with the bottom of their clear opening no more than 44
inches (1118 mm) above the loft floor provided the egress roof access
window complies with the minimum opening area requirements of
Section R310.2.1.”
(2021, ord 21-61, sec 1.) 5B-3-3
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Division 2. Appendix Added to the International Residential Code.
Section 5B-3-21. Reserved.
(2021, ord 21-61, sec 1.) 5B-3-21
Section 5B-3-22. Appendix U; Factory-built Housing.
Appendix U is added to this code, to read as follows:
“APPENDIX U
FACTORY-BUILT HOUSING
SECTION U101
APPLICABILITY
U101.1 Purpose. These provisions are applicable to the design,
construction, installation, and transportation of factory-built housing
within the County. Unless otherwise specified this article shall be
applicable only to factory-built housing which is sold or offered for sale
to first users as defined below.
Exception: Manufactured homes manufactured and certified in
accordance with the Manufactured Home Construction and Safety
Standards as promulgated by the United States Department of
Housing and Urban Development. Foundation, exterior stairs,
additions and accessory structures shall comply with Article 1,
Adoption of the International Building Code and International
Residential Code for One- and Two-Family Dwellings.
All provisions of the building, housing, electrical, and plumbing codes
shall be applicable unless indicated otherwise in this article.
U101.2 Definitions. The following terms are defined for specialized
use within this article:
“Building official” means the director of the department of public
works or the director’s authorized representative.
“Factory-built housing” means any structure or portion thereof
designed primarily for residential occupancy by human beings, which
is either entirely prefabricated or assembled at a place other than the
building site.
“First user” means a person, firm or corporation who initially
installs factory-built housing within this State. A person who
subsequently purchases an installed factory-built housing is not a first
user within the meaning of this definition.
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§ 5B-3-22 H AWAI‘I C OUNTY C ODE
“Insignia of approval” means a tag, tab, stamp, label or other
device issued by the building official to indicate compliance with the
statutes and these rules.
“Installation” means the assembly of factory-built housing on site
and the process of affixing factory-built housing to land, a foundation
or an existing building.
“Manufacture” means the process of making, fabricating,
constructing, forming, or assembling factory-built housing at a place
other than the building site.
“Site” means the parcel of land on which factory-built housing is
installed.
U101.3 Building permit required.
(a) No person shall perform any of the following work or cause or
permit the same to be done on any factory-built housing in the
County, without first obtaining a permit for this work from the
building official:
(1) Manufacture, install, erect, construct, enlarge, alter, repair,
relocate, improve, remove, convert, or demolish any factory-
built housing;
(2) Manufacture, erect, install, enlarge, alter, repair, remove,
convert, or replace any electrical work; or
(3) Manufacture, erect, install, enlarge, alter, repair, remove,
convert, or replace any plumbing, fire sprinkler, gas, or
drainage piping work, or any fixture, gas appliance, water
heating, or water treating equipment.
(b) To obtain a permit, an applicant shall comply with sections: 5-4-1;
5-4-2, 5-4-3, 5-4-4, 5-4-5, 5-4-6, 5-4-7, and 5-4-8.
U101.4 Building permit fee. A fee for each building permit as set
forth in section 5-7-3 of chapter 5, shall be paid to the building official.
U101.5 Insignia of approval.
(a) Factory-built housing manufactured in this County which is sold
or offered for sale to first users within this County shall bear the
insignia of approval issued by the building official indicating that
the factory-built housing is in compliance with this article.
(b) Factory-built housing manufactured outside the County shall
bear the insignia of approval issued by any governmental or
inspectional agency approved by the building official.
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U101.6 Performance of building, electrical, and plumbing
work.
(a) All building, electrical, and plumbing work performed within the
State of Hawai‘i shall comply with State of Hawai‘i contracting
and licensing laws and regulations.
(b) All building, electrical, and plumbing work to be performed at the
factory outside of this state must be accomplished:
1. Under the supervision of a licensed building contractor,
licensed supervising electrician, or master plumber,
respectively, of the state in which the factory is located, if the
manufacturer submits a quality control manual which is
approved by the building official; or
2. By licensed building contractors, electricians, or plumbers,
respectively, of the state in which the factory is located.
U101.7 Inspections.
(a) Each and every factory-built housing manufactured outside of this
County shall be inspected by a governmental or inspectional
agency approved by the building official in conformance with the
quality assurance standards approved by the building official and
in compliance with County of Hawai‘i codes and regulations.
(b) All manufacturing work, including building, electrical, and
plumbing, shall be inspected in the factory by the building official
to ensure compliance with the requirements of the construction
code. It shall be the duty of the permit holder or their agent, to
cause the work to remain accessible and exposed for inspection
purposes. All inspections of factory-built housing shall comply
with sections 5-8-1, 5-8-2, 5-8-3, 5-8-4, 5-8-5, 5-8-6, and 5-8-7.
U101.8 Manufacturer’s label.
(a) Each and every factory-built housing manufactured outside of this
County shall have a manufacturer’s label on a metal plate
showing the manufacturer’s name, serial number of the building,
manufacture date, design load criteria, and an inspection stamp
by a governmental or inspectional agency approved by the
building official securely fastened on the factory-built housing;
(b) Each and every factory-built housing manufactured in the County
of Hawai‘i shall have a manufacturer’s label on a metal plate
showing the manufacturer’s name, serial number of the building,
manufacture date, design load criteria, and building official
inspection stamp securely fastened on the factory-built housing.
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U101.9 Transporting factory-built housing. The transportation of
factory-built housing shall be governed by the provisions of the County
and State traffic codes.”
(2021, ord 21-61, sec 1.) 5B-3-22
Article 4. Building Work Within Special Flood Hazard Areas.
Section 5B-4-1. General applicability.
(a) The provisions of this article shall apply to new construction or the renovation and
major alteration, addition, or reinstallation of any existing buildings or structures,
within a special flood hazard area as identified by chapter 27, Hawai‘i County Code.
Such construction work shall comply with chapter 16 of the International Building
Code, and chapter 27, Floodplain Management.
(b) The provisions of this article shall not apply to the following:
(1) Any building or structure exempted from chapter 27;
(2) Any building or structure which has been granted a flood control variance
pursuant to article 5, chapter 27; or
(3) Any building or structure lawfully existing prior to November 8, 1993, subject
to the provisions of chapter 27.
(2021, ord 21-61, sec 1.) 5B-4-1
Section 5B-4-2. Definitions.
As used in this article, unless it is apparent from the context that a different
meaning is intended:
“Base flood elevation” means the water surface elevation of the base flood.
“Flood or flooding” means:
(1) A general and temporary condition of partial or complete inundation of
normally dry land areas from:
(A) The overflow of inland or tidal waters;
(B) The unusual and rapid accumulation or runoff of surface waters from any
source; or
(C) Mudslides (i.e., mudflows) which are approximately caused by flooding as
defined in paragraph (1)(B) of this definition and are akin to a river of
liquid and flowing mud on the surfaces of normally dry land areas, as
when earth is carried by a current of water and deposited along the path
of the current; or
(2) The collapse or subsidence of land along the shore of a lake or other body of
water as a result of erosion or undermining caused by waves or currents of
water exceeding anticipated cyclical levels or suddenly caused by an unusually
high water level in a natural body of water, accompanied by a severe storm, or
by an unanticipated force of nature, such as flash flood or an abnormal tidal
surge, or by some similarly unusual and unforeseeable event which results in
flooding as defined in paragraph (1)(A) of this definition.
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“Special flood hazard area” means an area having special flood or flood-related
erosion hazards, and shown on the Flood Insurance Rate Maps as Zones A, AO, AE,
A99, AH, VE, or V.
“Water-tight” when referring to construction below the inundation level, means
constructed to exclude moisture and withstand the hydraulic pressure resulting from
the anticipated depth of inundation.
(2021, ord 21-61, sec 1.) 5B-4-2
Section 5B-4-3. General Requirements.
Contractor will provide a certified flood zone elevation mark on jobsite for flood
zone elevation reference point.
(2021, ord 21-61, sec 1.) 5B-4-3
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