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pex retrofit over slab under tile
I have a 2000 square foot insulated [under and sides] slab with a 6 mil vapor barrier. I want to add pex and tile and keep the total thickness to a safe minimum. What are my options? I don't really want to go with gypcrete. If I use an additional 6 mil separation barrier between the existing slab and the new mud bed, will I have any issues with the double vapor barrier? The existing slab is well cured - 1980's.