Cobb County inspectors have recently focused their attention on the spacing of anchor straps (mudsill anchors) in house foundations. They require that when anchor straps are used, they must be the equivalent of anchor bolts spaced 6’-0” on center. That spacing distance is established by each anchor strap manufacturer. And, spacing varies between those manufacturers.
Be sure your foundation contractor is following the maximum spacing guidelines for the specific anchor strap they are using. You may want your foundation contractor to provide you with documentation that shows the maximum spacing for that specific anchor strap manufacturer. Then, if/when your Cobb County inspector raises the question, you will be prepared.
If your anchor strap spacing is not compliant, we have been told that shooting Hilti anchors into the sill plate is not an acceptable solution to the problem. Cobb County will likely require expansion bolt type anchors drilled through the sill plate and into the concrete foundation. Of course, this is very difficult to do once the flooring system is in place, which is often when the anchor straps are examined by the inspector.
If you prepare for this increased attention to anchor straps before your foundation is constructed, then you’ll save yourself headaches and lost time during your framing inspection.
