Q: I’m installing 1/2-inch-diameter screw anchors in concrete footings. How long does the concrete need to cure before I can drill and drive the anchors? And are there concrete mixes that have a faster curing time?
A: Bill Palmer, an engineer and the editor-in-chief of Concrete Construction, a sister publication of JLC, responds: Screw anchors (such as those available from Simpson Strong-Tie or ITW Red Head) are a great addition to the more common concrete anchors on the market today and have the same pull-out strength as expansion anchors or adhesive...
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