Code requires a 1/2&#; minimum and extend 7&#; into masonry or concrete and a maximum of 6&#; on center. Plus one shall be 12&#; within end of wall and a minimum of 2 per plate. (See R403.1.8)

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In seismic zones and high wind areas all that changes.

The Code requires an edge distance based on the size of the bolt:

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1. 1/4&#; = 1 1/2&#;
2. 1/2&#; = 2 1/2&#;
3. 5/8&#; = 3&#;

This is based on standard grade concrete, (i.e.: , , etc.) If you use a &#;high-strength&#; concrete it can be reduced. (See ICC Chapter 19, Table .2) Generally, I see &#;J-bolts&#; installed after the foundation wall is poured. This is primarily because we want a smooth surface for the sole plate to rest on. The bolts can be wiggled into the concrete and twisted so it hooks under the top horizontal rebar, which should be approximately 3&#; clear down from the top of the wall. Yes, 10&#; anchor bolts are now required with 3&#; square washers in any high-wind or seismic area.

Technical Info

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