What size lumber is used for sill plates?

Sill plates are typically 2x6 or 2x8 lumber, matching the wall framing width. Most modern homes use 2x6 for better insulation.

How is a sill plate attached?

Sill plates are secured with anchor bolts embedded in the concrete, typically 1/2-inch J-bolts with washers and nuts.

Pressure Treated Sill Plate Calculator

Calculate linear feet and board count of pressure treated sill plates needed for your foundation.

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Enter Your Measurements

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How to Use This Calculator

1Measure total foundation perimeter in feet.
2Select board length (common: 8 ft, 12 ft, 16 ft).
3Click Calculate for board count.

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About This Material

Pressure-treated (PT) sill plates are the lowest horizontal wood member of the wall framing. The treatment resists rot and insect damage from ground contact and moisture.

Installation Tips

•Use ACQ or CA pressure-treated lumber rated for ground contact (UC4B).
•Pre-drill for anchor bolts before laying on foundation.
•Apply borate treatment to cut ends.

Common Mistakes to Avoid

Using non-PT lumber for sill plates — this will rot.
Not using correct hardware rated for pressure-treated lumber (PT-compatible fasteners).