Anyone Tapcon Ply Subfloors into Concrete? Screw Spacing?
I’ve got a “basement” room in a slab on grade bi-level house with partially below grade lower level.
– Put concrete sealer across the exposed 11″x11″ area.
– Underlayment of DMX 1-step 2.0 dimpled plastic.
Now, I’m adding 3/4″ T&G Advantech 4×8 subfloor panels.
Using 1/4″ tapcons, fastening the panels into the concrete (thru the underlayment, of course).