|Posted by TerryA on October 03, 2002 at 04:31:47:|
|In response to Re: Studor Valves..................................|
: I'm building a small house and the kitchen and bath share a wall. The lav sink and kitchen sink are on that wall, but the toilet is not. I was looking on the Studor website and their diagrams still show a pipe to roof even with Studor valves??? Will I still need a pipe thru the roof using Studors?
There should always be at least one vent through
An air admittance valve only allows air to enter the drainage system, it can not relieve pressure from the drainage system. Otherwise, there would be sewer gas being introduced into the house.
There are times when the drainage system is under a slight amount of pressure (due to municipal sewers being cleaned, effects of other adjacent building drainage systems which tie-in to the sewers, etc.).
If there is not a vent through the roof and pressure is occuring your drainge system, it will force it's way through the water seal in the trap of the plumbing fixtures. Thus allowing sewer gas to enter the house.
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