Soil Stack S bend?!!

[Tocky]

I am trying to plan out a new bathroom and the sewage inlet is directly below the bathroom (inside the house) but I ideally I want the soil stack to go outside the house.

Is it possible for the soil stack to be outside and return inside at ground level to join the sewage inlet?

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• Tocky
• 17 Jun 2015

 

[bernardgreen]

External soil pipes are frowned upon. Various reasons one of which is that in cold weather they can become constricted by a build up of ice inside the pipe.

If the local Building Control allow the external then think carefully about how you will deal with a blockage in the S bend.

Steep slopes as in your second option lead to the flushing water and the solid matter separating leaving the solid matter to dry and harden in the pipe.

 

[PrenticeBoyofDerry]

The soil waste ideally should go directly vertically down, this allows for solids to pass through the middle of the pipe and flushing water on the outer internal.

 

[JimCrow]

perfectly acceptable what you plan to do,
fit a rodding access pipe above the top offset bend before the pipe goes through the wall.

 

[dhutch]

But it inside, dont do half a job.

 

[Nige F]

Tocky - you're getting so much mixed info I'm going to keep quiet and suggest you ask your local building control. Because I'd say none of the above apart from Prenticeboy

 

[Hugh Jaleak]

+1 to Nige. The Building regs frown upon bends in the wet part of the stack, and also require a (slow) 'rest' bend is used at the foot of the stack. If you want to move the stack outside, then you need to dig down and make a correct connection to the drain externally and block off the existing drain through into the building at both ends, once this is redundant.