How do you prevent mold under flooring of a house on concrete slab?
House is being built on concrete slab. I would like to ensure that moisture coming through the slab will not be trapped beneath the flooring.
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Is your slab built already? It should be protected from ground moisture as well as insulated, and either a vapor barrier or a sufficient amount of EPS foam insulation would prevent moisture from migrigrating up from the ground where it can cause mold. A couple of questions and we can help more – Where are you building? And what is below the slab or planned for below the slab (vapor barrier or not and how much insulation), and will it be heated?
Here are a few pages on how to build a slab on grade properly. There you will find all you need about slab on grade insulation and vapor protection.
Hello and thanks for responding to my question. The house is not yet started and will be built in Fort Mill, South Carolina. I know that the builder includes a pebble or a similar foundation before laying concrete. I think they use a vapor barrier. I asked for the building specs but perhaps that is not something a builder likes to give out, as I have not received them. Thanks for the link.
We have an old cottage so no vapor barrier under cement but there is tar paper over cement. Replaced some tar paper water proof painted cement and installed vapor barrier installed furring stripes and covered with plywood. Checked a year later before redoing the rest of the cement and found mildew under plastic vapor barrier. Water table is high being near the lake. So do I just remove tar paper, clean floor and put down vapor barrier, seems like this might be a recurring problem years down the line? Thanks for any advice.