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2007 SUPPLEMENT TO THE IRC 1. Nominal 1 -inch -by -4 -inch (19.1 mm by 88.9 mm) continuous diagonal braces let in to the top and bottom plates and the intervening studs or approved metal strap devices installed in accordance with the manufacturer's specifications. The let -in bracing shall be placed at an angle not more than 60 degrees (1.06 rad) or Tess than 45 degrees (0.79 rad) from the horizontal. 2, Wood boards of 5/8 -inch (15.9 mm) net minimum thickness applied diagonally on studs spaced a maximum of 24 inches (610 mm). Diagonal boards shall be attached to studs in accordance with Table R602.3(1). 3. Wood structural panel sheathing with a thickness not less than 3/8 inch (9.5 mm) for 16 -inch (406 mm) or 24 -inch (610 mm) stud spacing. Wood Structural panels shall be installed in accordance with Table R602.3(3) and Table R602.3(1), 4, One -half-inch (12.7 mm) or 25/32 -inch (19.8 mm) thick structural fiberboard sheathing applied vertically or horizontally on studs spaced a maximum of 16 inches (406 mm) on center. Structural fiberboard sheathing shall be installed in accordance with Table R602.3(1). 5. Gypsum board with minimum 1h -inch (12.7 mm) thickness placed on studs spaced a maximum of 24 inches (610 mm) on center and fastened at panel edges including top and bottom plates at 7 inches (178 mm) on center with the size nails specified in Table R602.3(1) for sheathing and Table R702.3.5 for interior gypsum board. 6. Particleboard wall sheathing panels installed in accordance with Table R602.3(4) and Table R602.3(1). 7. Portland cement plaster on studs spaced a maximum of 16 inches (406 mm) on center and installed in accordance with Section R703.6. 8. Hardboard panel siding when installed in accordance with Table R703.4. Exception: Alternate braced wall panels constructed in accordance with Sections R602.10.3.2.1 or R602.10.3.2.2 shall be permitted to replace any braced wall panel in any of the above methods of braced wall panels. R602.10.2.1 Braced wall panel interior finish material. Braced wall panels shall have gypsum wall board installed on the side of the wall opposite the bracing material. Gypsum wall board shall be not less than 'h inch (12.7 mm) in thickness and be fastened in accordance with Table R702.3.5 for interior gypsum wall board. Exceptions: 1. Wall panels that are braced in accordance with Method 5. 2. Wall panels that are braced in accordance with Section R602.10.3.2 . 3. When an approved interior finish material with an in -plane shear resistance equivalent to gypsum board is installed. 4. For Methods 2, 3, 4, 6, 7, and 8, gypsum wall board is permitted to be omitted provided the percentage of bracing in Table R602.10.1(1) is multiplied by a factor of 1.5. R602.10.2.2 Adhesive attachment of sheathing in Seismic Design Categories C, Do, D1 and D2. Adhesive attachment of wall sheathing shall not be permitted in Seismic Design Categories C, Da, DI and D2. R602.10.3 Minimum length of braced panels. For Methods 2, 3, 4, 6, 7 and 8 above, each braced wall panel shall be at least 48 inches (1219 mm) in length, covering a minimum of three stud spaces where studs are spaced 16 inches (406 mm) on center and covering a minimum of two stud spaces where studs are spaced 24 inches (610 mm) on center. For Method 5 above, each braced wall panel and shall be at least 96 inches (2438 mm) in length where applied to one face of a braced wall panel and at least 48 inches (1219 mm) where applied to both faces. For Methods 2, 3, 4, 6, 7 and 8, for purposes of computing the percentage of panel bracing required in Table R602.10.1(1), the effective length of the braced wall panel shall be equal to the actual length of the panel. When Method 5 panels are applied to only one face of a braced wall panel, bracing percentages required in Table R602.10.1(1) for Method 5 shall be doubled. Exceptions: 1. Lengths of braced wall panels for continuous wood structural panel sheathing shall be in accordance with Section R602.10.4. 2. Lengths of alternate braced wall panels shall be in accordance with Section R602.10.3.2.1 or Section R602.10.3.2.2. 3. For Methods 2, 3, 4, 6, 7 and 8 in Seismic Design Categories A, B, and C: Panels between 36 inches and 48 inches in length shall be permitted to count towards the required percentage of bracing in Table R602.10.1(1), and the effective contribution shall comply with Table R602.10.3. IRC -44 Copynghted it 2007 ICC (ALL RIGHTS RESERVED), licensed to Neil Erickson pursuant to License Agreement wim ICC No further reproductions authorized or dennbution authonzed ANY UNAUTHROIZED REPRODUCTION OR DISTRIBUTION ISA VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER