I wish to move my soil stack air vent.? at the moment its in the loft & passes down through th bathroom.?

Question

I want to lower it so its below the work top of the bathroom funiture, so I don't have to box the pipe in. Is this possible?

Answer 1

Depends on your local plumbing codes. In the U.S., vent stacks must exit through the roof. You cannot end it inside the house. Sewer gas is very dangerous.

Answer 2

You could cut the soil pipe off just below the height of the bath and fit an air admittance valve which is a non return valve which will allow air to enter the pipe but will not allow the smells etc to exit the pipe.

The need for a open vent on the soil stack is not about sewer gas or smell etc, its about making sure air can enter the pipe to prevent a partial vaccum being formed in the pipe as the toilet is flushed and the action of the water rushing down the pipe drags air with it.

If you decide to do this make sure you cut off the soil stack above the toilet outlet!

Answer 3

Moving Soil Stack

Answer 4

Yes it is possible, i have just done it, you have to take the stack out, take the loo out and drill through the wall to the outside, dig a hole outside to the drains in line with your soil stack, if you don't have a manhole then build one (or buy a plastic one) join the new pipe outside to underground, tee off for the bathroom, then up until you are 3 feet above the nearest opening window. In effect, you are just moving the stack about 18" in it's entirety, but it is a bigger job than most people think!

Answer 5

If by lowering it you mean stopping it below your bathroom fixture, then no you can't do this. It must vent outside above the roof line. You might be able to run it through a wall section, but it will mean a lot of work.

Answer 6

Yes, no problem, but remember it has to vent outside, and above your gutter height, So you'll need vertical pipework outside to take the outlet above your gutter.

Answer 7

c captainflack, cut stack above hieght of wc bowl(BLOCKAGES)