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2305.3.10 Sill Plate Size and Anchorage in Seismic Design Category D
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Two-inch (51 mm) nominal wood sill plates for shear walls shall include steel plate washers, a minimum of 3/16 inch by 2 inches by 2 inches (4.76 mm by 51 mm by 51 mm) in size, between the sill plate and nut. Sill plates resisting a design load greater than 490 plf (LRFD) (7154 N/m) or 350 plf (ASD) (5110 N/m) shall not be less than a 3-inch (76 mm) nominal member. Where a single 3-inch (76 mm) nominal sill plate is used, 2-20d box end nails shall be substituted for 2-16d common end nails found in Line 8 of Table 2304.9.1.
Exception: In shear walls where the design load is less than 840 plf (LRFD) (12 264 N/m) or 600 plf (ASD) (8760 N/m), the sill plate is permitted to be a 2-inch (51mm) nominal member if the sill plate is anchored by two times the number of bolts required by design and 3/16 inch by 2 inch by 2 inch (4.76 mm by 51 mm by 51 mm) plate washers are used.