Soil pipe problem on single storey extension

[geriatrix]

My son has bought a house which has a rear single storey extension. The soil pipe from the loo etc rises to just the height of the eaves of the extension and stops. This looks like bad news, and is probably illegal.

His plumber suggested fitting am air admittance valve to the top of it, but I thought these could only be used internally because of the possibility of freezing.



Not really sure what to do. Is there a filter or something that can be attached to the top instead of a valve, or would it be permissible to make a right angle to take pipe over the extension roof, and then another right angle to take it up to the required height on the main building.

Thanks for any suggestions - looks like he's bought a whole load of trouble......

DaviD J

 

[SimonG]

Cut it back a bit 2 135 elbows, bit of pipe and birdcage on top. Then you'll need to replace that cut soffitt.

 

[Gray0689]

Cut it back a bit 2 135 elbows, bit of pipe and birdcage on top. Then you'll need to replace that cut soffitt.

Or you can just cut a bit off pipe and put a birdcage on it either way will be fine

 

[tamz]

Looks like it may have been a flat roof at one time. Not much of a plumber to advise a durgo fitted outside.

 

[That Extra Mile]

If you want to do things 'by the book' the regs say (from memory!) if the stack terminates within 3m of an opening into the building it should be extended to at least 900mm above it. Do not use an air admittance valve - as you suspect they can freeze. A birdcage is all you need. Jonathan, That Extra Mile Heating and Plumbing, London

 

[geriatrix]

Cut it back a bit 2 135 elbows, bit of pipe and birdcage on top. Then you'll need to replace that cut soffitt.

Thanks, but surely i'll have to get the pipe across the extension and up the side of the main house, in order to vent above the second storey windows?

 

[geriatrix]

Looks like it may have been a flat roof at one time. Not much of a plumber to advise a durgo fitted outside.

No, he wasn't. And he was meant to come back on site today, but never showed up!

 

[Gray0689]

Thanks, but surely i'll have to get the pipe across the extension and up the side of the main house, in order to vent above the second storey windows?

Why???

 

[SimonG]

Why???

ditto.

 

[tamz]

No, he wasn't. And he was meant to come back on site today, but never showed up!

mg_smile: typical eh


"Thanks, but surely i'll have to get the pipe across the extension and up the side of the main house, in order to vent above the second storey windows?"

Unless someone in the house has a neck like a giraffe see post 5 for why you don't need to.

 

[Kev the gas]

as above

What the reg's state is that if the pipes' proximity to the window is within three meters then that pipe needs to finish at least 900mm above that window. If it is greater than 3m then it can terminate lower.

 

[geriatrix]

mg_smile: typical eh


"Thanks, but surely i'll have to get the pipe across the extension and up the side of the main house, in order to vent above the second storey windows?"

Unless someone in the house has a neck like a giraffe see post 5 for why you don't need to.

Oh OK. I was just a bit worried about fumes/smells getting in to the windows on the first floor. I suppose that they'll disperse fairly swiftly though.

Thanks you all for your quick help, seems like it's not the huge problem I thought it was. Cheers.

 

[pobsdad]

Unless I've used the bog,then 3m is nothing!

 

[Billy Bob Bob]

just for info dergos can be used externally but only poly pipe make one which complys with building control,and you have to glue its polystyrene cap on so it looks crap imho,but i agree a birds nest is all thats need here

 

[That Extra Mile]

just for info dergos can be used externally but only poly pipe make one which complys with building control,and you have to glue its polystyrene cap on so it looks crap imho,but i agree a birds nest is all thats need here

I didn't realise any could be used outside - thanks. If fitting one do you know if the 3m/900mm rule can be ignored? If gases can't escape then there should be no problem with it being close to an opening or window?

I think there's also a reg that says the vent at the top of the run should always be open. Can the Polypipe Dergo be fitted here?

 

[J c stokes]

Fitting a dergo is just over complicating things in my opinion. It's usually internal stacks that use dergos and I use the normally do 1 in 4 stacks must go to atmosphere on a runUnless you are getting smells into the house I would just terminate using a bird cage and not even bother using 135 bends

 

[kay-jay]

I didn't realise any could be used outside - thanks. If fitting one do you know if the 3m/900mm rule can be ignored? If gases can't escape then there should be no problem with it being close to an opening or window?

I think there's also a reg that says the vent at the top of the run should always be open. Can the Polypipe Dergo be fitted here?

yes the purpose of external aav's is to remove the need to use offsets and work above the roofline. the action of the valve prevents drains smells escaping and therefore you can terminate where you like. i think its flo-plast who do em.

the head of the drain should be open to atmosphere!

 

[That Extra Mile]

yes the purpose of external aav's is to remove the need to use offsets and work above the roofline. the action of the valve prevents drains smells escaping and therefore you can terminate where you like. i think its flo-plast who do em.

the head of the drain should be open to atmosphere!

Thanks. That all makes sense!