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be provided over each opening in interior and <br />Seismic Design Category Dshall be supported <br />2 <br />exterior bearing walls. Headers shall be sized <br />on continuous foundations. <br /> to support the load above in accordance with <br />WALL BRACING: <br />23. IRC Section 602.10. All <br />IRC Tables R502.5(1) and R502.5(2), or as <br />braced walls and cripple wall bracing in Seismic <br />designed to support the loads as specified in IRC <br />Design Category Dshall be constructed in <br />2 <br />Table R301.5. Alternately, wood structural box <br />accordance with IRC Table R602.10.1, (2), and <br />headers may be used in accordance with <br />(3) and Sections R602.10 and R602.11. <br />IRC Section R602.7.1, Table R602.7.2 and <br />Typically braced wall panels require nailing <br />Figure R602.7.2. Each end of all headers shall <br />patterns of 6” o.c. along all panel edges. All <br />have at least 1.5" of full-width bearing. <br />sheathing joints must be over studs (vertically) or <br /> <br />FIRE-BLOCKS & DRAFT-STOPS: <br />25. IRC <br />solid blocking (horizontally). <br />Sections R602.8, R502.12. Fire-blocking & <br /> <br /> Braced wall panels shall begin no more than <br />Draft-stopping shall be installed to cut off all <br />12’-6” from each end of a braced wall line. If the <br />concealed vertical and horizontal draft <br />braced wall panel is not located at the corner, <br />openings and shall form an effective fire barrier <br />then a 24” panel is required at the corner (in <br />between stories and between a top story and <br />addition to the 4’ BWP within 8’) or, a hold <br />the roof space. Fire-blocking shall be provided <br />down device is required at the end of the <br />in concealed spaces of wood stud walls and <br />braced wall panel end nearest the corner. See <br />partitions: vertically at the ceiling and floor <br />IRC R601.10.11.1 <br />levels; horizontally at intervals not exceeding <br /> <br /> Spacing of interior braced wall lines shall <br />10 feet; and at all interconnections between <br />not exceed 25 feet apart (except to <br />concealed vertical and horizontal spaces such <br />accommodate up to one room up to 900 square <br />as occur at soffits, drop ceilings and cove <br />feet, an increase to 35’ is allowed – <br />ceilings, as well as stair stringers at the top <br />adjustment factors will apply, See IRC <br />and bottom of the run and openings around <br />R602.10.11.1). <br />vents, pipes and ducts at ceiling and floor <br /> <br /> Braced wall lines may have offsets, out of <br />levels. Fire-blocking materials shall consist <br />plane of up to 4’0”. <br />of materials listed in IRC Section R602.8.1. <br /> <br /> In one-story buildings, braced wall panels <br />Loose-fill insulation material shall not be used <br />shall be supported on continuous foundations at <br />as a fire-block unless specifically tested in the <br />intervals not exceeding 50 feet. In two- story <br />form and manner intended. Fire-blocking of <br />buildings all interior braced wall panels shall <br />chimneys and fireplaces shall be in <br />be supported on continuous foundations. <br />accordance with IRC Section R1001.16. <br />(See exceptions in IRC Section R602.10.9.) <br />When there is usable space both above and <br /> <br /> Interior braced wall panels shall be fastened <br />below a concealed space of a floor/ceiling <br />to both the floor and roof framing in <br />assembly, draft-stops shall be installed so that <br />accordance with Table R602.3(1) (typically 3-16d <br />the area of the concealed space does not <br />@ 16” o.c.) <br />exceed 1000 square feet. Draft-stopping <br /> <br /> Cripple walls shall be braced as braced wall <br />materials shall consist of materials listed in <br />panels in accordance with IRC R602.10.11.4 and <br />Section R502.12.1. All fire-blocking and draft- <br />Tables R602.10.11.3. A cripple wall greater than <br />stopping shall be in place prior to requesting a <br />4’ shall be designated as the first story wall <br />framing inspection. <br />for purposes of designating the wall bracing <br /> <br />requirements (R602.10.6.1). <br />SIDING TYPE <br />26. IRC Section R703.3, R703.4, <br /> <br /> Where “stepped foundations” occur, See IRC <br />R703.5, R703.8, R703.9, R703.10, Table <br />Section R602.11.3 for additional requirements <br />R703.4. Exterior wall coverings shall be <br />such as plate strapping, cripple wall height <br />installed, attached and flashed in accordance <br />limitations, etc. <br />with the provisions of IRC Section R703 and the <br /> <br />siding manufacturer’s installation instructions. <br /> See the attached “Braced Wall Panel” and <br />Please note that masonry wall coverings <br />“Alternate Braced Wall Panel” details for typical <br />exceeding 3” in thickness require an <br />construction requirements. <br />engineered design in Seismic Design <br /> <br />OPENINGS IN EXTERIOR & INTERIOR WALLS <br />24. <br />Category DE <br />or (most of Hawai‘i County). <br />2 <br />(HEADERS): <br />IRC Section R602.7. Headers shall <br />See #67 <br />The County of Hawai‘i is an Equal Opportunity Provider and Employer <br /> <br /> <br />101 Pauahi Street, Suite 107 74-5044 Ane Keohoklole Hwy <br />ā <br />Hilo, Hawai‘i 96720 Kailua-Kona, Hawai’i 96740 <br /> <br />Tel: (808) 961-8331 Page 14 Tel: (808) 323-4720 <br /> <br />