Welcome to Q&A for Home Maintenance Q&A section, where you can ask questions and get answers from me and other members of the community.

Spam, self-promotion, questions with abusive, inappropriate language, and irrelevant questions will be deleted.
All of the questions are moderated!

You'll be notified when your question is answered. Please reply with Feedback to share whether a solution worked or didn't work. Thank you!

Connect on Google+
Find on Google+ Local

plumbing vents hight

0 votes
do plumbing vents have to be higher than the tiolet in an upstairs bathroom?
asked in Plumbing by debbie (120 points)
edited by darekrudy
Share this question on your favorite network.

1 Answer

0 votes


Hi Debbie,
Depending on the plumbing code adopted in your jurisdiction (IRC or UPC) different rules might apply to you plumbing vent installation. In UPC (Uniform Plumbing Code) all vents must terminate above the roof / above plumbing fixtures. In IRC (International Residential Code) only one (main vent stack) needs to terminate on exterior / IRC also allows for sidewall terminations. 
In addition to the above rules there are so called Air Admittance Valves (AAV) that are permitted in some areas and AAV’s must be installed min 4” above the fixture’s drain (for single fixture), and min. 6” above the flood level of highest fixture in branch venting (multiple fixtures in a system). 
Again, it depends on your jurisdiction requirements so I can’t give you any definitive answers but in general; a plumbing vent must be always located above any plumbing fixtures in the system.
answered by darekrudy (21,730 points)