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A304.3.2 Placement of Chemical Anchors and Expansion Bolts
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Chemical anchors or expansion bolts shall be placed within 12 inches (305 mm), but not less than 9 inches (229 mm), from the ends of sill plates and shall be placed in the center of the stud space closest to the required spacing. New sill plates may be installed in pieces when necessary because of existing conditions. For lengths of sill plate greater than 12 feet (3658 mm), anchors or bolts shall be spaced along the sill plate as noted in Table A3-A. For other lengths of sill plate, see Table A3-B. For lengths of sill plate less than 30 inches (762 mm), a minimum of one anchor or bolt shall be installed.
Exception: Where physical obstructions such as fireplaces, plumbing or heating ducts interfere with the placement of an anchor or bolt, the anchor or bolt shall be placed as close to the obstruction as possible, but not less than 9 inches (229 mm) from the end of the plate. Center-to-center spacing of the anchors or bolts shall be reduced as necessary to provide the minimum total number of anchors required based on the full length of the wall. Center-to-center spacing shall not be less than 12 inches (305 mm).
| NUMBER OF STORIES | LENGTHS OF SILL PLATE | ||
| Less than 12 feet (3658 mm) to 6 feet (1829 mm) |
Less than 6 feet (1829 mm) to 30 inches (762 mm) | Less than 30 inches footnote (762 mm)c |
|
| One story | Three connections | Two connections | One connection |
| Two stories | Four connections for 1/2-inch (12.7 mm) anchors or bolts or Three connections for 5/8-inch (15.9 mm) anchors or bolts |
Two connections | One connection |
| Three stories | Four connections | Two connections | One connection |
- Connections shall be either chemical anchors or expansion bolts.
- See Section A304.3.2 for minimum end distances.
- Connections shall be placed as near to the center of the length of plate as possible.
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A304.3.2 Prescriptive Provisions for Seismic Strengthening of Cripple Walls and Sill Plate Anchorage of Light, Woodframe Residential Buildings, Placement of Chemical Anchors and Expansion Bolts
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