Flooring on top of under-insulated slab
Our new home will have 2″ of rigid foam under the basement slab and a poly vapour barrier. We are using cork plank flooring for 90% of the floors and tile in the washrooms. Given that the concrete itself contains moisture and the cork manufacturer states a vapour barrier must be used over concrete what is the most cost-effective method to install the flooring? I am considering a dimpled membrane like Delta FL and installing the cork directly over top or possibly 1″ rigid foam and again installing directly over top. I don’t see the need to utilize plywood or OSB for a floating cork floor although the tile will get plywood over whichever method I go with.
Or am I overly concerned about slab moisture and should install directly over the slab?
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