Hello All - I am in the midst of renovating my basement. I have decided to install finished on-site engineered hardwood. My contractor recommended that I install a subfloor (5/8th inches) above dimple board. I noticed that he is pre-drilling through the concrete every 16" and inserting a 3" tapscon screw. I am far from an expert in home renovations, let alone subfloor installs, but should he be drilling all the way through the concrete slab? I am concerned about a few things: (1) water penetration, (2) cracks in the slabs given the number of holes I have now, and (3) loose screws given there is nothing in front of the screw now. Should he not just drill a little more than the length of the screw, vacuum the excess powder and screw the tapscon in? Appreciate your thoughts on this.
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