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Community and Q&A

Radon Mitigation and Vapor Barriers Under Slab

user-6445625 | Posted in General Questions on

Hey folks, does anyone have an opinion about the thickness or spec for our under-slab vapor barrier for radon mitigation? Trying to decide between 15 and 20 mil. thanks

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Replies

  1. plumb_bob | | #1

    Either will work if detail correctly. Remember that it is not just a vapour barrier, but also an air barrier, and must be detailed as air tight around all penetrations. Frequent areas of concern are around sumps and at the slab perimeter.

    If drain rock is installed between the ground and the poly, the thicker poly will stand up better to damage during construction.

    1. user-6445625 | | #2

      thank you bob!

  2. Expert Member
    Michael Maines | | #3

    If it's going to be covered with a concrete slab, I think 15 mil is more than enough. I spec 10 mil.

  3. JeffWilliams56 | | #4

    hi

  4. abramsjey34 | | #5

    Thanks a lot

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