I will be installing four vinyl porch posts on an existing concrete slab that is 4" thick. The tapcon concrete screws I will be using are 1/4" x 2 1/4". How close can I get to the edge of the concrete without worrying about cracking the concrete?
Edge Distance for Drilling into Concrete
JetMech642
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With Concrete Screws you want to maintain an edge distance of at least 6 anchor diameters, but keep in mind your tension and shear values are greatly reduced when you are this close. You need to be at least 12d from an edge to get full tension and shear
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