Residential Building Plan Review Guidelines

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by full-depth solid blocking not less than 2” space of at least 30” by 30” shall be provided at nominal thickness; or by attachment to a header, the front or service side of the appliance. See band, or rim joist; or shall be otherwise provided M1305.1.4 for details of mechanical equipment with lateral support to prevent rotation. See IRC access. Tables R502.3.1(1) & (2) for floor joist spans, FRAMING: 22. IRC Sections 602.3.1, 602.3.2, R502.5(1) & (2) for girder spans, and R502.3.3 (1) 602.3.3, 602.3.4, 602.6 & 602.9. Studs shall & (2) for cantilever spans. A load path for lateral be a minimum No. 3, standard or stud grade forces shall be provided between floor framing and lumber, except that utility studs may be used braced wall panels located above or below a floor. for bearing studs not supporting a floor BEARING PARTITIONS: 19. IRC Section 502.4. above or nonbearing studs. Utility grade Joists under parallel bearing partitions shall be of studs shall not be spaced more than 16" on adequate size (as a beam) to support the load. center, support more than a roof and ceiling, or Double joists, sized to adequately support the load, exceed 8' in height for exterior and load bearing that are separated to permit the installation of piping walls. The size, height, and spacing of all other or vents shall be full-depth, solid-blocked with wood-framing studs shall be in accordance with lumber not less than 2 inches in nominal thickness Table R602.3(5). (Maximum 10 feet in Seismic spaced not more than 4 feet on center. Bearing Design Category D.) Studs shall be placed 2 partitions perpendicular to joists shall not be offset with their wide dimension perpendicular to the from supporting girders, walls or partitions more wall. Wood stud walls shall be capped with a than the joist depth unless such joists are of double top plate installed to provide sufficient size to carry the additional load(s). overlapping at corners and intersections with bearing partitions. End joints shall be offset at UNDER-FLOOR CLEARANCE: 20. HCC 5-71 (30) least 24”. Studs shall have full bearing on a When floor joists or the bottom of a wood structural nominal 2” or larger plate or sill having a width floor are located within 24" or wood girders are at least equal to the width of the studs. Where located within 18" to the exposed ground in crawl joists, trusses, or rafters are spaced more spaces or unexcavated area located within the than 16” o.c. and the bearing studs are periphery of the building foundation, all spaced 24” o.c. such members shall bear within components of the floor assembly shall be pressure 5” of the studs beneath. treated wood or wood of natural resistance to decay, Cutting and notching: May not exceed 25% of including all posts, beams or girders, joists and the stud width in bearing or exterior walls and sub-floor. The under-floor grade shall be cleaned may not exceed 40% of a single stud width in of all vegetation and organic material. All wood non-bearing partitions. forms used for placing concrete and construction Bored or drilled holes: The diameter of the materials shall be removed before the building is resulting hole may not exceed 40% of the stud occupied width, can be no closer than 5/8” to the edge UNDER-FLOOR ACCESS: 21. IRC Section 408.4. of the stud, and may not be located in the & HCC 5-71 (30) same section as a cut or notch. See IRC Access shall be provided to all under-floor spaces. Section R602.6 for exceptions. See IRC Access openings through the floor shall be a Figures R602.6(1), R602.6.2(2), and R602.6.1 minimum of 18” x 24”. Openings through a for additional details. perimeter wall shall be at least 16” x 24”. When Foundation Cripple walls, IRC Section R602.9: any portion of the through wall access is below Foundation cripple walls shall be framed of grade, an areaway of not less than 16” x 24” shall studs not less in size than the studding above. be provided. The bottom of the areaway shall be When exceeding 4’-0” in height, such walls below the threshold of the access opening. shall be framed of studs having the size Through wall access openings shall not be required for an additional story. Cripple walls located under a door to the residence. Under-floor with a stud height less than 14” shall be spaces containing appliances shall be provided with sheathed on at least one side with a wood an unobstructed passageway large enough to structural panel that is fastened to both the top remove the largest appliance but not less than 30” and bottom plates in accordance with Table high by 22” wide, nor more than 20‘ long from R602.3(1) or the cripple walls shall be the opening to the appliance. A level service constructed of solid blocking. Cripple walls in 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 13 Tel: (808) 323-4720