I am remodeling my kitchen. I removed several layers of flooring.
At the bottom there is some 3/8" ply. On top of that was tar paper and some 5/8" particle board.
I removed everything but the ply at the bottom due to glued flooring and 18000 staples.
To reassemble it I bought more 5/8" osb and 1/4" tile backer.
Do I need to reapply the layer of tar paper between the two wood layers (or some other material)?
Are screws or nails generally recommended for fastening subfloor?
Should the subfloor panels have gaps where they meet or be flush?