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// CODE SNIPPET

A304.3.2 Placement of Chemical Anchors and Expansion Bolts

Existing Building Code 2009 of Pennsylvania > A3 Prescriptive Provisions for Seismic Strengthening of Cripple Walls and Sill Plate Anchorage of Light, Woodframe Residential Buildings > A304 Strengthening Requirements > A304.3 Foundation Sill Plate Anchorage > 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).
TABLE A3-B
SILL PLATE ANCHORAGE FOR VARIOUS LENGTHS OF SILL PLATEa,b
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
  1. Connections shall be either chemical anchors or expansion bolts.
  2. See Section A304.3.2 for minimum end distances.
  3. Connections shall be placed as near to the center of the length of plate as possible.

Related Code Sections


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
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 ...
Existing Building Code 2009 of Pennsylvania > A3 Prescriptive Provisions for Seismic Strengthening of Cripple Walls and Sill Plate Anchorage of Light, Woodframe Residential Buildings > A304 Strengthening Requirements > A304.3 Foundation Sill Plate Anchorage > A304.3.2 Placement of Chemical Anchors and Expansion Bolts
A403.11.4 Earthquake Hazard Reduction in Existing Woodframe Residential Buildings With Soft, Weak or Openfront Walls, Hold-Down Connectors
consist of tightening the nut on the tension anchor after the placement but before the tightening of the shear bolts in the panel boundary flange ...
Existing Building Code 2009 of Pennsylvania > A4 Earthquake Hazard Reduction in Existing Woodframe Residential Buildings With Soft, Weak or Openfront Walls > A403 Analysis and Design > A403.11 Wood-Framed Shear Walls > A403.11.4 Hold-Down Connectors
1901.3 Concrete, Anchoring to Concrete
- or L-bolts), post-installed expansion (torque-controlled and displacement-controlled), undercut and adhesive anchors ...
Building Code 2015 of Pennsylvania > 19 Concrete > 1901 General > 1901.3 Anchoring to Concrete
A304.3.2 Prescriptive Provisions for Seismic Strengthening of Cripple Walls and Sill Plate Anchorage of Light, Wood-Frame Residential Buildings, Placement of Anchors
plate, anchor placement shall be in accordance with Table A3-B. Exception: Where physical obstructions such as fireplaces, plumbing or heating ...
Existing Building Code 2015 of Pennsylvania > A3 Prescriptive Provisions for Seismic Strengthening of Cripple Walls and Sill Plate Anchorage of Light, Wood-Frame Residential Buildings > A304 Strengthening Requirements > A304.3 Foundation Sill Plate Anchorage > A304.3.2 Placement of Anchors
A107.4 Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings, New Bolts
All new embedded bolts shall be subject to periodic special inspection in accordance with the building code, prior to placement of the bolt and grout ...
Existing Building Code 2009 of Pennsylvania > A1 Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings > A107 Quality Control > A107.4 New Bolts
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