Where to vent soil pipe?

markwm · 13 Jan 2011

Had some building work done on the house, this meant the soil stack had to be removed, previously it was inside the house, exiting out the roof. (see pic)

It's now been moved to the side of the house (outside) but not connected up yet as the bathroom needs doing. Part of the old stack is still in place above first floor level.

My question is, where is the best place to vent it? Connect up to the old pipe and have it vent out the roof, or continue the new pipe up the side of the house and have it vent there? or does it matter. Toilet location can be seen here.

xr4x4 · 13 Jan 2011

cap off or remove the old one and continue the new one up the side of the house and vent it there.

Richard C · 13 Jan 2011

Do you have a good reason for moving the stack from the current location? How far is the toilet from the "new" stack location? What else & how do you propose to connect into the “new” stack? You also need to take into account that a new stack & connection to the foul drain is notifyable work, will involve Building Control, inspection & possible witness testing.

Jayluvit · 13 Jan 2011

Hi there,
Not an expert in this and I have no knowledge in this subject but I would continue the new install on the outside wall as this will then make it the same pipe layout as before.

markwm · 13 Jan 2011

Stack was moved because it was basically in the middle of the kitchen, builders moved it(not me).

Toilet is around 2m from stack outside, so the pipe enters the house and runs along the joist to the toilet.

Richard C · 14 Jan 2011

markwm said:
Stack was moved because it was basically in the middle of the kitchen, builders moved it (not me).

Ah, so it’s already been moved; in that case, I would continue up the outside for the stack vent & completely remove the internal stack. I assume that the new stack & its connection to the foul drain have been inspected? Builders often ignore such niceties but compliance with BR’s is ultimately your responsibility.

markwm said:
Toilet is around 2m from stack outside, so the pipe enters the house and runs along the joist to the toilet.

That’s fine as long as the minimum fall is maintained. Ideally you should have separate stack connections for sink, shower, bath rather than teeing into a common run as this can cause siphoning problems without venting or fitting anti-siphon traps.

slapper · 14 Jan 2011

Vent needs to terminate 900mm above openable window

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Where to vent soil pipe?

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