Johngalt1957
New Member
Yesterday I was crawling around in a section of my crawl space that is under a bathroom addition of my house and discovered the vent for the bathtub, sink and toilet is in my crawl space. The bathtub and sink drain pipes connect into the large pipe coming from the toilet and the large pipe runs into the sewer line in the main crawl space about twenty feet away. The vent pipe comes off of the main pipe from the toilet with a y coupling, the vent pipe is 3 in. pipe ( I think, I have not measured it ) that is angled down with two elbow couplings for about three feet where it rest upon the ground, where rats can easily crawl up. That is the vent. To fix this problem I am either going to run the vent pipe outside the exterior wall of my house and to the roof or install a AAV. My question is which option would be better since the connection for the vent is in my crawl space several feet below where a proper vent would be connected in the wall. Thanks in advance for any help.