Stack pipe vertical/straight line

[oldbutnotdead]

Morning,

Not sure if this is best here or on Building..... anyway.

Putting in a new WC, shower, basin etc. in what was the coalhole. Building Control want an additional stack vent- which is going to look very odd sticking up by a metre above the guttering (single storey building, window above where the loo is going)

Before I plague them with the question, does the stack pipe have to be vertical and straight? Reason- if I'm allowed a couple of 30 degree bends then I can use an offset to put the top of the stack pipe up near the ridge of this single storey building where it'll look less silly. I've had a look at Part H and it doesn't say no but it doesn't say yes either.....

Cheers

 

[Jackrae]

Rules are for the guidance of wise men.

If it doesn't say "no" then that implies you can install it as you wish provided it provides the desired function - ie a vent stack.

 

[oldbutnotdead]

Cheers- and I've just realised, of course you're allowed an offset, I've got one in the existing cast iron where it kicks out to get past the eaves/gutter. Doh!

 

[doitall]

You can put as many bends on it as you like provided it is open to atmosphere.

However, if the main drain is already vented you don't need another, and I suspect he means a "Stub Stack with an AAAV" to protect any traps

 

[muggles]

If you do need to install a full open-air vent then you're allowed to install it in 80mm pipe rather than 110mm pipe, which might look a bit less ugly

 

[oldbutnotdead]

Ta both- I wasn't sure about needing a stack, this new loo is draining into a separate branch from the branch with the stack (there's 4 branches all jointing at a manhole, all needing renewing at some stage) so (as long as I can offset it) and especially if I can do it in 80mm then its no big deal and certainly won't do any harm