SOIL STACK: Condensation from inaccessible joint

[onwards]

Condensation from inaccessible joint...
I have a water leak running down my internal soil stack which is coming from a joint that is 1 metre above the highest wet entry point.
The joint seal is broken and during these cold months condensation is forming higher in the pipe and escaping out.
Access to this joint is very limited (boxed and tiled in).

I was thinking about replacing the cap on the top of the stack (which is external and accessible) with an external air admittance valve hoping that this might stop it.

Would this work???

TIA

 

[fitz1]

dont think they do an external aav.a durgo valve can freeze .get a 4inch chimney china mans hat type cowl.

 

[onwards]

http://www.screwfix.com/prods/47962/Plumbing/Soil-Vent/FloPlast-AXV110-Air-Admittance-Valve-Grey

Screwfix do one for £33, apparently suitable for outdoors. The internal ones have an operating range of -20 to +60 C, external ones have a mesh?
Thanks for looking..

 

[Nige F]

with respect, are you assuming the water is coming out of the inaccesible joint . more likely to be coming in and running down the outside of the pipe where the pipe exits through a lead slate with ll weathering collar Glued onto the pipe and probably isn`t glued even if it is there. Don`t put any durgo on it . It will achieve nothing

 

[onwards]

I positive that the water is coming out of the joint. I witnessed it in the past and tried to seal it with waterproof sealant which worked for a while. It was keyhole surgery trying to do it.
I don't want to take tiles and boxing off again because I'll do major damage.
The pipe does not exit the roof. It goes through a wall at 90 degrees and then up. Theres no water on the external pipe.

Can I have an AAV/Durgo as the only air input on a soil stack run. This pipe is the only air vent for my 2 toilets.

 

[adlplumbing]

with respect, are you assuming the water is coming out of the inaccesible joint . more likely to be coming in and running down the outside of the pipe where the pipe exits through a lead slate with ll weathering collar Glued onto the pipe and probably isn`t glued even if it is there. Don`t put any durgo on it . It will achieve nothing

i agree with you mate water only travels downward unless it has been heated up as far waste are concerned