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Radon Mitigation vent into plumbing vent?

knobhead | Posted in Building Code Questions on

Is it an acceptable practice to install, in the attic space, a wye on the plumbing stack, and run the radon stack into it, thereby saving one roof penetration? This is a new build in zone 5.THX!

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  1. GBA Editor
    Martin Holladay | | #1

    No. Among the possible reasons that you wouldn't want to do this: if the water in the P-trap of a rarely used sink evaporates, your radon mitigation system could send radon into the house (especially if the plumbing stack had a bird's nest in it).

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