How to find the right Square Washers AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Square Washers
- Code-driven size for sill anchors
- In higher seismic zones, residential codes commonly require square plate washers under sill-plate anchor bolts, often 3 in by 3 in by about 0.229 in. Check your local code. Inspectors check this, and round washers can fail the inspection.
- Bearing area on timber
- Size the washer so the wood does not crush at the design load. Square washers on wood spread load more than round ones and resist turning.
- Coating for treated lumber
- Use hot-dip galvanized or stainless on preservative-treated wood. Treated lumber corrodes plain zinc-plated steel quickly.
- Hole size
- Match the hole to the anchor or bolt diameter. Use a slotted-hole version only where the code or design allows it. An oversized hole reduces bearing area and can let the joint slip.
Brands that matter
- Simpson Strong-Tie: Bearing plate washers for anchor bolts.
What to avoid
- Thin stamped square washers in place of code-rated plate washers
- Electro-zinc washers on treated sills