What is the recommended spacing for attaching plywood over XPS to a concrete slab with Tapcon screws. Do I need to screw around the perimeter of the plywood or the entire panel to the floor?
Thanks,
Rick
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Tapcons
I have done much the same on walls. Just srewing the edges can pull them down to much and cause the field to raise up, out of plane. I use a 9' and 6' staight edge to check the flatness as i go along and add tapcons as needed in the field. I also use PL 300 behind the plywood to help minimize the number of tapcons.