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Meanie[_4_]

On 4/26/2014 12:15 AM, wrote:

A free floating interlock floor should have the recommended underlay
foam to take up the motion and stop noise. A nailed down or glued down
floor does not need the cushion. If installing hardwood flooring above
an unheated space, a vapour barrier might be adviseable even over a
solid plywood subfloor, but over "conditioned space" it is not
required.

That makes more sense and something I did when I laid my free floating
floor in the basement. I didn't think I needed the foam and vapor
barrier upstairs when nailing hardwood which is why I asked. Since the
lower floor is heated, I assume, per your statement, it is not required.

Thanks