Originally Posted by firemanbud343
Well I wound up filling the holes with calking. I put down a vapor barrier, foam insutation board, and plywood. Now how do screw it all down? Do self tapping screws work or do i need to pre drill holes? Thanks
I used tongue and groove 5/8" and made sure they had a good tight caulked fit (with one another), leaving 1/4" on the sides (for contraction / expansion). Then I floor nailed and used flooring adhesive on wide hickory flooring boards in the orthogonal direction (down the bus so that they crossed the plywood grooves.)
I left my sub-floor "floating", in that I didn't feel the need to put holes in my floor. I don't have that much weight on it and it has survived well through several cold winters and summer temperatures. There is absolutely no sign of buckling or other warping. For those that use actual hardwood flooring, I doubt you will have a problem with it. However, if you're going to use some other option, (i.e. laminate, pergo, etc...) you may want to tap-screw it down as it wont be as rigid and may buckle a lot easier.