Residential Building Plan Review Guidelines

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263. Fire- resistant-rated floor-ceiling and wall Attics which exceed 30 square feet and have assemblies shall extend to and be tight against the a vertical height of 30” or more as measured exterior walls, and wall assemblies shall extend from from the top of the ceiling framing member to the foundation to the underside of the roof sheathing. the underside of the roof framing members Wall assemblies need not extend through attic must be provided with an access opening of spaces when the ceiling is protected by 5/8” Type X not less than 22” x 30” and located in a gypsum board, an attic draft stop is provided above hallway, corridor, or readily accessible location. When the access is located in the ceiling, and along the wall assembly, and the structural minimum unobstructed headroom in the attic frame supporting the ceiling is protected by not less space shall be 30” at some point above the than ½” gypsum board. Townhouses shall be access measured vertically from the bottom separated by either a 1-hour fire- resistance-rated of the ceiling framing members. Attics wall assembly at each townhouse, or a common 2- containing appliances shall be provided with hour fire-resistance-rated wall assembly between an opening and a clear and unobstructed townhouses, with no plumbing, ducts, or vents in passageway large enough to allow removal of the cavity, tested in accordance with E119 or UL the largest appliance and with an opening 263. See R302 for details of fire-resistant-rated with a minimum dimension of 20” by 30” and construction. FIRE-RESISTANCE OF EXTERIOR WALLS: maximum passageway of 20’ long measured 24. 1-hr fire-from the opening to the appliance. See IRC Section R302.1 Table R302.1. resistive construction is required within 5 feet of M1305.1.3 for additional details. property lines. Openings are not permitted at DOORS & EXITS: At 28. IRC Section R311.2. less than 3’ and are limited between 3’ and 5’. least one egress door shall be provided in Projections are allowed to be protected with 1-each dwelling unit. The egress door shall be a hour fire-resistance rated construction on the minimum clear width of 32” when measured underside when the projection is between 2’ and between the face of the door and the stop 5’ from the property line. Unprotected, detached (usually a 36” door) and clear height of 78”, and garages shall be at least 3 feet away from other that can be opened without the use of a key, tool residential or accessory buildings. or special knowledge. FLOOR AREA: LANDINGS: 25. IRC Section R304 & HCC 5071, 29. IRC Section R311.3. There shall 310.3.7 & 310.3.8. Dwelling units shall have at least be a floor or landing on each side of exterior one habitable room with not less than 120 square doors with dimensions of at least 36” measured in feet of floor area. Other habitable rooms except the direction of travel, and at least the width of the kitchens shall have an area of not less than 70 door served. The floor or landing shall be not square feet with a minimum dimension of 7’ in one more than 1.5” lower than the threshold of the direction. doorway, except doors may have the landing up MINIMUM CEILING HEIGHTS: 26. HCC Sect 5-71, to 7 ¾” below the level of the threshold provided the door does not swing over the landing (except 310.3.7 & 310.3.8. Habitable spaces shall have a that screen and storm doors may); OR, a landing ceiling height of not less than 7 feet 6 inches. Beams and girders spaced not less than 4 feet on is not required if the door is not the main exit and there are two or fewer risers. An interior door center may project not more than 6 inches below the required ceiling height. Ceilings in Kitchens, halls, may open at the top of a flight of stairs provided bathrooms, toilet compartments, and basements the door does not swing over the top step. without habitable spaces may have a ceiling height Exterior balconies may have a landing less than of 7’-0” with beams projecting to within 6’-6” of the 36” when the balcony is less than 60 s.f. and only finished floor. Bathrooms shall have minimum accessible from a door. Exterior landings may ceiling height of 7’-0” at the front clearance areas of have a slope not to exceed 2% (1” in 48”). There fixtures. If any room in a building has a sloping shall be a floor or landing at the top and bottom of ceiling, the prescribed ceiling height for the room is each stairway, except that a floor or landing is not required in only on half of the area thereof. No required at the top of an interior flight of stairs if portion of the room measuring less than 5 feet from a door does not swing out over the stairs. The the finished floor to the finished ceiling shall be width of the landing shall be the same width as included in any computation of the minimum area the stairs and 36” long. thereof. GUARDS: 30. IRC Section R312 & R613.2. ATTIC ACCESS: 27. IRC Section R807.1. The County of Hawai‘i is an Equal Opportunity Provider and Employer 101 Pauahi Street, Suite 107 74-5044 Ane Keohoklole Hwy ā Hilo, Hawai‘i 96720 Kailua-Kona, Hawai’i 96740 Tel: (808) 961-8331 Page 9 Tel: (808) 323-4720