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Discuss New build house smell in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Messages
48
Back in the old days, each and every house had a soil and vent pipe open to atmosphere. The vast majority of these systems are still giving good service and need no attention as there . I can, however, see a slight disadvantage in having such a system in that each house will have an inside pipe that becomes an outside pipe with associated thermal bridging, whether the stack runs externally or whether it runs internally and up through the roof.

Nowadays, it is common to have fewer open vents than houses. Those houses that do not have an open vent will have a 'durgo' or AAV at the top of the soil and vent pipe. This works until the valve fails and a smell comes up through the faulty valve. Provided there is easy access to replace the valve, and people don't do idiotic things such as box the valve in where you cannot see it, this is not a problem. But the system relies on the fact that at least one house (or more if required at design stage) has an open vent, and some people just don't understand this.

Part of the problem is the (probably unavoidable) grey area between what work really needs a dedicated plumber and what does not. Obviously a general builder could construct a perfectly functional drainage system, but this relies on a fit for purpose building control system, which the UK currently lacks. As others have noted, private building control inspections often lack substance.
I am learning everyday about plumbing! far more than I ever thought I would need to know. I am grateful for all the interest and helpful replies. So far the opinion is that we need a vent, we are amazed that the builder, drainage people and building control have let this through. The builder is local and well respected, having build lots of properties in this village, so you would think this would have been avoided.
The problem lies now with getting him to correct this, meanwhile we live with the rotten smell.
 

Ric2013

Plumber
Messages
2,958
I am learning everyday about plumbing! far more than I ever thought I would need to know. I am grateful for all the interest and helpful replies. So far the opinion is that we need a vent, we are amazed that the builder, drainage people and building control have let this through. The builder is local and well respected, having build lots of properties in this village, so you would think this would have been avoided.
The problem lies now with getting him to correct this, meanwhile we live with the rotten smell.
Where is the top of your soil pipe, I'm wondering?
 

king of pipes

Esteemed
Plumber
Gas Engineer
Messages
4,921
I am learning everyday about plumbing! far more than I ever thought I would need to know. I am grateful for all the interest and helpful replies. So far the opinion is that we need a vent, we are amazed that the builder, drainage people and building control have let this through. The builder is local and well respected, having build lots of properties in this village, so you would think this would have been avoided.
The problem lies now with getting him to correct this, meanwhile we live with the rotten smell.
No need if you do as I recommended ? it will work till Mr builder he's his act together
 
Messages
370
Unfortunately very few builders really understand drainage both below and above ground. Add to that plumbers who think aav's and anti vac traps cure poor design your in trouble!
I suspect what's happening in your case is as pump kicks in it causes enough of a vacuum to take seal out of trap before the aav can open.
 
Messages
62
current building control is the perfect example of feudalism in action in the 21st. The clergy (Capita plc) collect bribes (payments that are demanded each year) from the vassals (plumbers) so the Royal ministers (council) can have a recuring income from the peasants (you and I) by inflicting laws in exchange for taxes (forced payments) for everyday living)
 
Messages
48
Unfortunately very few builders really understand drainage both below and above ground. Add to that plumbers who think aav's and anti vac traps cure poor design your in trouble!
I suspect what's happening in your case is as pump kicks in it causes enough of a vacuum to take seal out of trap before the aav can open.
So am assuming that a vent on the pump would solve that? Would we still need a vent on the house too?
 
Messages
370
Check out building regulations H1 section 2.18
Also even if the aav was suitable it needs to be above wash basin hight.
Keep it simple vent pipe fitted at highest point of drains .
 
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king of pipes

Esteemed
Plumber
Gas Engineer
Messages
4,921
The AAV is behind the family bath. That must be the top of the vent pipe? It is lower than the sink but have been told that really is not a problem.
It needs to be above all waste outlets, visible and accessible
 

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Messages
48
Check out building regulations H1 section 2.18
Also even if the aav was suitable it needs to be above wash basin hight.
Keep it simple vent pipe fitted at highest point of drains .
Have looked, thanks very helpful. We have been told that the AAV although lower than the washhand basin wasn't a problem as its only in case of a flood? Would that cause smell? Is it a big job to put a SVP through roof?
 

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