11:16AM | 10/07/08
Member Since: 10/17/06
4 lifetime posts
I have a 2yr old home that I am now finishing the basement, I have a full bath that was roughed in by the builder. His plumber has a capped pvc pipe that is coming out of the basement ceiling between 2 1st floor joists and it is marked "basement and btr(or bnr) vent" I went to cut the cap off to make the connection from the shower and toilet/vanity vent to this pipe and I got drenched with clean water. My questions are, is it normal to get water in a vent pipe? is this an actual vent pipe or a drain/vent from an above floor? I got approx. 3gal. of water out, could this be rain water from the roof vent?and if so should it make it all the way to the basement? thanks in advance for any answers.... John


08:39AM | 10/09/08
Member Since: 01/24/06
1449 lifetime posts
Rather then guess where the piping is going why not do any of the following

1- contact the builder.

2- Contact the builders plumber

3- Get a copy of the blue prints

Yes it is very possible for a vent line to have water in it because of the vapors present in sewer gases and as hot air rises the moisture inside the piping hits the colder piping walls because of the ambient temperature much like a glass of ice sitting out on a warm day.

The moisture exiting the vent terminal can freeze in certain climates and this condition is called hoarfrost.

Also vent piping has to pitch AWAY from the fixtures being served so the condensate will flow back to the drain being served or a drip leg is needed.

Another reason the vent piping has to pitch up from the fixture is a Phenomena known as heat rises and sewer gases being lighter have this tendency to rise and cold air is denser so the FAI is located around 6" above grade and the VT terminates 2- 7 feet above the roof with a 4" opening and PVC annot be exposed to direct sun light


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