GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

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!

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  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).

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |