Soil pipe through soffit

[pen7fold]

Hi
Is it ok to run a soil pipe from outside to inside via the soffit and then put an air valve on it in the loft? I am assuming they still do not make an external air valve.
Also if i am changing soil pipes and downpipes but not the underground system do I have to put a soakaway in?
Cheers

 

[Richard C]

Is it ok to run a soil pipe from outside to inside via the soffit and then put an air valve on it in the loft?

As you refer to a sofit, I assume your only planning to offset the dry portion of the stack? offsets in the wet portion are not a good idea & there are Building Regs. covering this. But why do you want to bring it inside, can’t you just extend the stack above the eaves & leave it as an open vent?

I am assuming they still do not make an external air valve.

They do actually;
http://www.humm-busters.com/en/AX110.html

But BR’s only allow fitting one if you have another “open” vent somewhere else on the system.

Also if i am changing soil pipes and downpipes but not the underground system do I have to put a soakaway in?

Soakaways are for surface water only not foul water & you’re no longer allowed to make new connections to put surface water into the foul drain system either. As long as your existing drainage systems are coping OK then you don’t need to replace anything.

 

[pen7fold]

Thanks Rich for the reply,
It is only the dry section above toilet level and the reason for coming indoors is that the soffit is quite deep and at the moment the cast iron one sticks right out and looks an eyesore,the replacement one would be no better.
As far as the drainage it was just clarification that if I did not alter the underground pipework then it was still ok for the rainwater to go down the foul.

Cheers

 

[Hugh Jaleak]

Couple of thoughts.....

You could reduce the dry section of the stack to 82mm, may not look so obtrusive if existing setup is replicated.

Or, terminate under the soffit (with a cage on the top), provided the vent is the permitted distance away from windows etc or fit external AAV at this point, (again if permitted).

If you are simply replacing existing rainwater goods, then there is no problem with using exisiting drainage arrangements. Only if a new paved or roof area is to be drained then alternative arrangements must be provided. I believe discharging into a foul sewer is only allowed in extreme circumstances with the permission of Building Control.

 

[Richard C]

If you are simply replacing existing rainwater goods, then there is no problem with using exisiting drainage arrangements. Only if a new paved or roof area is to be drained then alternative arrangements must be provided. I believe discharging into a foul sewer is only allowed in extreme circumstances with the permission of Building Control.

Correct.