hi guys Im fitting a new soil pipe/stack , as bathroom is being moved to another room. Do you think it is ok to keep the existing soil stack just for use with the kitchen sink / washing machine ? and more to the point, is it possible to cut the soil stack right down to just where the kitchen wastes go into it + cap the pipe off ? or does it still need to go above the eves and be open / vented as a normal stack ? the new + old ( current ) soils stacks are about 5-6 m away from each other any help greatly appreciated, cypher
You can keep it and chop it right down but you need to fit a breather on it, a vent valve, often called a durgo, like this:- http://www.screwfix.com/p/floplast-push-fit-air-admittance-valve-grey-af110/78150;jsessionId=1ZqpRnpDkl7K96dSJMJghn072C9s1wZMhcQGlm722srdzJy2h72C!-811273355!1366187619957
thanks Peter I have seen these valves but " It is recommended that air admittance valves are not used externally as environmental debris will affect the air tightness performance of the valve " ? does this mean its against current regulations to fit + use them outside ?
They are normally fitted inside and yes that is preferred but you can get smaller ones that fit internally on 40mm waste. That would be better:- http://www.screwfix.com/p/floplast-air-admittance-valve-32-x-40-x-50mm/42968
Ive had a look and it seems you can get - AAV specifically for external use - if i get one of these, you say I can chop the soils stack right down, to say just 1m from ground + cap it off with the external grade AAV ? or does it still need to be 900mm above any opening window ?
No opening window is irrelevant, since it only works one way, it sucks air in but won't let soiled air out, it is done to stop water being sucked out of any traps under sinks etc, that is the reason for a vent in the first place. As long as it is higher than the waste pipe so that it is above any water line. The highest would be the sink waste outlet.
I think an alternative would be to cut the soil pipe right down - to below ground level . And fit a 4" gulley and trap as you would with gutter downpipe drains. Then your kitchen waste pipe would just aim down into it. If cosmetics is an issue, it could be a much neater solution. Since it's open to the air at the top - tho' sealed from the underground drain with the P trap - you won't have 'suction' issues. Tbh, even with your own idea, with the relaitively low flow from a kitchen sink, I doubt you'd have much of a suction issue. You might want to decide to risk putting the 1 1/2" pipe straight in to the 4" soil and cap off the end. If there's an 'issue', then add an AAV *cough*
Question is, will the new soil pipe be in any way connected to the drain of the old soil pipe? If so, you will have venting, and you can seal the 40mm sink pipe at the ground. Mr. HandyAndy - Really
thanks for all the help, really appreciated I think I will try just cutting the current soil pipe to about 1m off ground + cap it off if i get a problem then fit an AAV the ' new ' soil pipe Im fitting, is actually where it was originally, previous owner moved bathroom to a larger room + fitted a soil stack that connects to the original clay underground soil drain ( + then removed the original soil stack completely ) so im reverting back to how it wouldve been, only that this time, Ive got the 2nd soil stack , which i will keep for the sink / washer drain, rather than run them 5m or so with longer runs to my new stack cypher
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