Hi, bought an air admittance valve from Toolstation (item 77893 from
toolstation.com) to avoid piercing the roof with my soil stack. It
slides over the 110mm pipe quite snuggly but there is no rubber seal
etc. Is this meant to be solvent welded or sealed with silicone? All
the rest of the 110 mm soil from toolstation is push-fit and I was
asssuming this would also be push-fit.
Thank you

On 11 May, 10:40, nafuk wrote:
Hi, bought an air admittance valve from Toolstation (item 77893 from
toolstation.com) to avoid piercing the roof with my soil stack. It
slides over the 110mm pipe quite snuggly but there is no rubber seal
etc. Is this meant to be solvent welded or sealed with silicone? All
the rest of the 110 mm soil from toolstation is push-fit and I was
asssuming this would also be push-fit.
Thank you

The ones I've seen have had a sort of corrugated rubber seal to the
soil pipe. Could it be that it has a bit missing?

Personally I wouldn't want to use solvent as it will be impossible to
ever remove. And from what others say on this group, that does
occasionally happen. Silicone would work OK I would think though.

Jon.

On 11 May 2007 02:40:12 -0700, nafuk
wrote:

Hi, bought an air admittance valve from Toolstation (item 77893 from
toolstation.com) to avoid piercing the roof with my soil stack. It
slides over the 110mm pipe quite snuggly but there is no rubber seal
etc. Is this meant to be solvent welded or sealed with silicone? All
the rest of the 110 mm soil from toolstation is push-fit and I was
asssuming this would also be push-fit.
Thank you

I thought soil pipes had to vent to the outside?

Presumably this will vent into the roof space?

If this is correct, I can save myself a lot of money.

On 11 May, 11:30, EricP wrote:
On 11 May 2007 02:40:12 -0700, nafuk
wrote:

Hi, bought an air admittance valve from Toolstation (item 77893 from
toolstation.com) to avoid piercing the roof with my soil stack. It
slides over the 110mm pipe quite snuggly but there is no rubber seal
etc. Is this meant to be solvent welded or sealed with silicone? All
the rest of the 110 mm soil from toolstation is push-fit and I was
asssuming this would also be push-fit.
Thank you

I thought soil pipes had to vent to the outside?

Presumably this will vent into the roof space?

If this is correct, I can save myself a lot of money.

Mostly they do have to vent to the outside, but in some circs you can
use an AAV instead.

However, having had a situation where some kind person put about 10Lb
of rotting meat in our local drain, the smell of which came up through
the anti syphon traps in our kitchen (as it was unable to get up the
soil stack due to this having an AAV on top of it) I wouldn't
recommend it.

We have now had the stack vented properly above the eaves.

I thought soil pipes had to vent to the outside?

Presumably this will vent into the roof space?

If this is correct, I can save myself a lot of money.

Not so simple.

Air admittance valves are permitted in many but not all designs of
soil stack.

http://www.planningportal.gov.uk/upl...F_ADH_2002.pdf

In an earlier contribution to this discussion,
EricP wrote:

On 11 May 2007 02:40:12 -0700, nafuk
wrote:

Hi, bought an air admittance valve from Toolstation (item 77893 from
toolstation.com) to avoid piercing the roof with my soil stack. It
slides over the 110mm pipe quite snuggly but there is no rubber seal
etc. Is this meant to be solvent welded or sealed with silicone? All
the rest of the 110 mm soil from toolstation is push-fit and I was
asssuming this would also be push-fit.
Thank you

I thought soil pipes had to vent to the outside?

Presumably this will vent into the roof space?

If this is correct, I can save myself a lot of money.

It depends how you define 'vent'. It is a one-way valve which lets air in to
stop a depression from forming in the stack but stops air - and hopefully
smells! - from coming out.

AAVs are useful in some circumstances (I have one in my extension) but there
are regs about having to have a 'properly' vented stack fairly close.
--
Cheers,
Roger
______
Email address maintained for newsgroup use only, and not regularly
monitored.. Messages sent to it may not be read for several weeks.
PLEASE REPLY TO NEWSGROUP!

On 11 May, 11:08, Tournifreak wrote:
On 11 May, 10:40, nafuk wrote:

Hi, bought an air admittance valve from Toolstation (item 77893 from
toolstation.com) to avoid piercing the roof with my soil stack. It
slides over the 110mm pipe quite snuggly but there is no rubber seal
etc. Is this meant to be solvent welded or sealed with silicone? All
the rest of the 110 mm soil from toolstation is push-fit and I was
asssuming this would also be push-fit.
Thank you

The ones I've seen have had a sort of corrugated rubber seal to the
soil pipe. Could it be that it has a bit missing?

Personally I wouldn't want to use solvent as it will be impossible to
ever remove. And from what others say on this group, that does
occasionally happen. Silicone would work OK I would think though.

Jon.

Hi, thank you for the reply. The AAV fits snugly over the 100mm pipe
so no, there is no rubber seal missing

On Fri, 11 May 2007 10:30:37 +0000, EricP wrote:

On 11 May 2007 02:40:12 -0700, nafuk
wrote:

Hi, bought an air admittance valve from Toolstation (item 77893 from
toolstation.com) to avoid piercing the roof with my soil stack. It
slides over the 110mm pipe quite snuggly but there is no rubber seal
etc. Is this meant to be solvent welded or sealed with silicone? All
the rest of the 110 mm soil from toolstation is push-fit and I was
asssuming this would also be push-fit.
Thank you

I thought soil pipes had to vent to the outside?

Presumably this will vent into the roof space?

If this is correct, I can save myself a lot of money.

Yes, but. The stack furthest upstream must still vent to open air.

Other stacks can use the AAV provided it's 1m above the WC connection and
inside (so it doesn't freeze stuck).

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards

Ed Sirett wrote:
On Fri, 11 May 2007 10:30:37 +0000, EricP wrote:

On 11 May 2007 02:40:12 -0700, nafuk
wrote:

Hi, bought an air admittance valve from Toolstation (item 77893 from
toolstation.com) to avoid piercing the roof with my soil stack. It
slides over the 110mm pipe quite snuggly but there is no rubber seal
etc. Is this meant to be solvent welded or sealed with silicone? All
the rest of the 110 mm soil from toolstation is push-fit and I was
asssuming this would also be push-fit.
Thank you
I thought soil pipes had to vent to the outside?

Presumably this will vent into the roof space?

If this is correct, I can save myself a lot of money.

Yes, but. The stack furthest upstream must still vent to open air.

Not quite true. There has to be at least one vent every so often to
prevent positive pressure, but it needn't be the most upstream one.


Other stacks can use the AAV provided it's 1m above the WC connection and
inside (so it doesn't freeze stuck).