Anchor bolt
An anchor bolt is a threaded bolt set in concrete that fixes the building frame to the foundation.
An anchor bolt is a threaded bolt set in concrete that fixes the building frame to the foundation.
Definition
An anchor bolt is cast into the top of a foundation, or drilled and epoxied into it, so a sill plate or steel base plate can be bolted down.
A plain example
Illustrative example only: J-shaped bolts are set in wet concrete at the plan spacing, with a stated length sticking out so the plate, washer and nut can be fitted.
Why it matters
Anchor bolts resist uplift from wind and sliding from earthquake loads. A missing bolt can fail an inspection.
Common confusion
An anchor bolt is cast in or installed as the primary connection. A retrofit or post-installed anchor is drilled in later and needs its own approval.
On a project
Check bolt size, embed depth, spacing and the position relative to the plate edge before concrete is placed.
Quick answers
- How far apart are anchor bolts? The plan or code gives a maximum spacing and edge distance.
- Can I add one after the pour? Post-installed anchors exist but need approved products and procedures.
- Why do inspectors check them? They are part of the load path from roof to ground.
Related terms
Always check the project drawings and specification, and confirm requirements with the engineer of record and the local authority.
Questions people ask
How far apart are anchor bolts?
The plan or code gives a maximum spacing and edge distance.
Can I add one after the pour?
Post-installed anchors exist but need approved products and procedures.
Why do inspectors check them?
They are part of the load path from roof to ground.
Sources and further reading
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