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I can't recommend adding a plastic moisture barrier between the pads. Really if you have moisture in the soil then it needs to work its way out. Moisture comes out of concrete all the time - we only see the worst case scenarios. If you leave the plastic in there then the water will get trapped on the bottom slab. Very good for the short-term. Long-term ...


Just to circle back on this... my radon contractor stipulated that a polyethylene layer is needed for radon mitigation, and my crawlspace contractor agreed. The crawlspace contractor broke the concrete in a pitchfork-shape (to get good radon coverage and get around some concrete footings that are supporting the steel I-beam). He then dug a trench, put ...

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