Sub-slab vapor barrier: above or below the insulation?
My contractor was thinking of putting the 6mil polyethylene vapor barrier below the 3″ of slab insulation. I assumed you want it above the insulation? He was concerned about the wire mesh used for tying my in slab radiant floor tubing t0o would damage the polyethylene.
Is it necessary to seal the polyethylene to the foundation wall before the slab is poured?
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