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2007 SUPPLEMENT TO THE IRC Exceptions: 1. Blocking at horizontal joints shall not be required in wall segments that are not counted as braced wall panels. 2. Where the bracing percentage provided is at least twice the minimum percentage required by Table R602.10.1(1) blocking at horizontal joints shall not be required in braced wall panels constructed using Methods 3, 4, 5, 6, or 8. R602.10.8 Cripple wall bracing. In Seismic Design Categories other than D2, cripple walls shall be braced with a percentage and type of bracing as required for the wall above in accordance with Table R602.10.1(1) with the following modifications for cripple wall bracing: 1. The percentage of bracing as determined from Table R602.10.1(1) shall be multiplied by a factor of 1.15, and 2. The wall panel spacing shall be decreased to 18 feet (5486 mm) instead of 25 feet (7620 mm). R602.10.8.1 Cripple wall bracing in Seismic Design Categories Do, D1 and D2. In addition to the requirements of Section R602.10.8, where interior braced wall lines occur without a continuous foundation below, the length of parallel exterior cripple wall bracing shall be one and one-half times the length required by Table R602.10.1(1). Where cripple walls braced using Method 3 of Section R602.10.2 cannot provide this additional length, the capacity of the sheathing shall be increased by reducing the spacing of fasteners along the perimeter of each piece of sheathing to 4 inches (102 mm) on center. In Seismic Design Category D2, cripple walls shall be braced in accordance with Table R602.10.1(1). R602.10.8.2 Redesignation of cripple walls. In any Seismic Design Category, cripple walls shall be permitted to be redesignated as the first story walls for purposes of determining wall bracing requirements. If the cripple walls are redesignated, the stories above the redesignated story shall be counted as the second and third stories respectively. R602.11 Wall anchorage. Braced wall line sills shall be anchored to concrete or masonry foundations in accordance with Sections R403.1.6 and R602.11.1 602.11.1 Wall anchorage for all buildings in Seismic Design Categories Do, D1 and D2 and townhouses in Seismic Design Category C. Plate washers, a minimum of 0 22 inch by 3 inches by 3 inches (5.8 mm by 76 mm by 76 mm) in size, shall be provided between the foundation sill plate and the nut except where approved anchor straps are used. The hole in the plate washer is permitted to be diagonally slotted with a width of up to 3/16 inch (5 mm) larger than the bolt diameter and a slot length not to exceed 1-3/4 inches (44 mm), provided a standard cut washer is placed between the plate washer and the nut, R602.11.2 Stepped foundations in Seismic Design Categories Do, D1 and D2. In all buildings located in Seismic Design Categories Do, D1 or D2, where the height of a required braced wall line that extends from foundation to floor above varies more than 4 feet (1220 mm), the braced wall line shall be constructed in accordance with the following: 1. Where the lowest floor framing rests directly on a sill bolted to a foundation not less than 8 feet (2440 mm) in length along a line of bracing, the line shall be considered as braced The double plate of the cripple stud wall beyond the segment of footing that extends to the lowest framed floor shall be spliced by extending the upper top plate a minimum of 4 feet (1219 mm) along the foundation. Anchor bolts shall be located a maximum of 1 foot and 3 feet (305 and 914 mm) from the step in the foundation.. See Figure R602.11.3. 2. Where cripple walls occur between the top of the foundation and the lowest floor framing, the bracing requirements of Sections R602.10 8 and R602,10.8.1 shall apply. 3. Where only the bottom of the foundation is stepped and the lowest floor framing rests directly on a sill bolted to the foundations, the requirements of Sections R403,1.6 and R602,11.1 shall apply.. Section R606.3 Change to read as shown: (RB238-06/07) R606.3 Corbeled masonry. Corbeled masonry shall be in accordance with Sections R606.3.1 through R606.3.3. Section R606.3.1, R606.3.2, R606.3.3 Add new sections to read as shown: (RB238-06/07) R606.3.1 Units. Solid masonry units or masonry units filled with mortar or grout shall be used for corbeling. IRC -54 ANY UNAUTHROIZED REPRODUCTION OR DISTRIBUTION ISA VIOLATION OE THE II"4 DERAL COPYRIGHT ACT No lTHI TENSE AGR aEMEN T AND SUBJECT aTO CIVIL, copyrighted 02007 ICC ALL RIGHTS RESERVED),licensed to Neil Erickson pursuant to License Agreement with ICC AND THu•, LICENSE AGREEMENT, Ca�UB.VEif:;P" TV°.A CIVIL AND CRIMINAL PENALTIES THEREUNDER,