Originally posted by Steve Babiak:
Not true. See links here:
Thanks Steve. From what I can see, all these tests check the integrity of the system from a leak standpoint, but the one thing they do NOT check is the primary function of the DWV system, i.e., does it drain??? To test that, you actually have to run water for several minutes down the drains and make sure it doesn't back up, indicating a blockage (tree roots, pipe collapse, foreign objects, bad vent, etc.). I don't see how pressure testing can reveal a problem there since it requires the introduction of several intentional blockages to make the system airtight! :mrgreen:
If the home is "winterized", I don't see a way around undoing the supply side other than pouring several 5 gallon buckets of water down the drain and see if they drain properly. And since the water is shut off in a winterized house, the water will have to be brought in from somewhere else (doesn't sound fun).
As I stated earlier, we had to wait for the listing agent to get authorization from the asset manager to de-winterize the last house we bought so we could perform our inspection. The broker in charge actually wanted us to "waive" the plumbing inspection!!! I never worked with so many morons on a home purchase before, but that's another subject.
I wished there had been another way to test the plumbing, hence my interest in pressure testing, but the fact is you WANT the DWV system to have a leak, ONE really BIG one, into the sewer system! :wink: