concrete seal

  1. M

    Can I use a penetrating sealant on concrete if there is black mastic on top of the slab?

    Hey everyone, I had a question about sealing my concrete slab before laying down flooring. I live in a very humid area and my building was built in the 60s, so they did not install a vapor barrier under the concrete slab subfloor. I get a lot of moisture coming up from the concrete so I wanted...
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