I am ripping up tiles on the ground floor of my home and would like to install 1/2 inch engineered hardwood. It is over a concrete slab on grade. What is the best and most economical way to do this once the tiles are removed and the concrete is cleaned and leveled?
-Can I float a plywood subfloor and then nail the hardwood to it? If so should I leave expansion gaps between the plywood and the walls? I have seen this suggested on other forums but doesn't seems to make sense to me. Shouldn't the subfloor be screwed down if the flooring is to be nailed to it?
-Or should I secure the subfloor to the concrete and then nail the wood flooring to that? What is the best way to go about doing this?
-A modular subfloor like Dricore seems great but expensive and maybe overkill for an on grade floor?
What is the best recommendation for this type of project? What subfloor should I use, how should it be installed, where should the vapor barrier be placed and what is the best way to secure the engineered hardwood flooring to the subfloor?