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Sewer vent pipe running across attic has a low spot and rainwater doesn't drain down.

0 votes
There is a pvc pipe that runs across the attic and connects to the stack vent that goes through the roof. The 'run' across the attic that eventually elbows down has a low spot before the turn down. Rain water collects in about a 2 foot section before the turn downward rather than draining on down the pipe. In extremely cold weather the water froze and cracked the pipe resulting in  drip ono the bathroom ceiling. (which is how i knew there was a problem).  I managed to replace the cracked section but what do I need to do to avoid  repeat? Shim the pvc pipe bit at the low point?
asked in Plumbing by greg01748 (120 points)
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1 Answer

0 votes
Hi Greg,

Yeah, either shim it or even better, install some PVC pipe hangers to make sure that there are no low spots along the run. Shims may fall out with constant temperature and humidity fluctuations unless you secure them to the framing.
answered by darekrudy (21,730 points)