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Is 2” EPS or XPS Styrofoam Totally Impermeable to Radon?

potton | Posted in General Questions on

In itself is styrofoam impermeable to radon?

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  1. Andrew_C | | #1

    No. Normally if you're using foam insulation under the floor, you cover it with a layer of plastic sheeting, and that is the barrier that prevents radon gas from coming up.

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