Basement subfloor assembly details
I am about to install a new basement subfloor. My research has led me to select the following subfloor assembly:
-1.5in rigid foam
-5/8 T&G plywood tapcon’d every 24in to slab
No 2-by sleepers in this subfloor.
The old subfloor had a vapor barrier against the slab. This house was built in the 80s; I would think it does not have a vapor barrier below the slab.
Also, as far as I know 1.5in of rigid foam is not considered to be a vapor barrier.
Therefore, in my case, should I install a vapor barrier between the slab and the rigid foam?
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