I'm aware that external AAVs are available, my query is: can I use one to replace the current (rotted) S&V and if so, can I get away without it needing to exit above the highest window?
As per the pics, I'm dealing with a high, 3-storey building. Access to replace the cast-iron pipe will need scaffolding at £1k a pop.
The flat roof btw is being replaced as I type, with EPDM rubber sheet and the rainwater pipe re-jigged to drain directly on to the roof rather than my heath-robinson affair seen here.
Edit:
I've just seen this thread on here as it happens. 6 pages!
I think that the gist of it is that it is ok and, does not need to be 900mm from a window. Feel free to correct me if I am wrong.
https://www.diynot.com/diy/threads/external-air-admittance-valve.612572/
As per the pics, I'm dealing with a high, 3-storey building. Access to replace the cast-iron pipe will need scaffolding at £1k a pop.
The flat roof btw is being replaced as I type, with EPDM rubber sheet and the rainwater pipe re-jigged to drain directly on to the roof rather than my heath-robinson affair seen here.
Edit:
I've just seen this thread on here as it happens. 6 pages!
I think that the gist of it is that it is ok and, does not need to be 900mm from a window. Feel free to correct me if I am wrong.
https://www.diynot.com/diy/threads/external-air-admittance-valve.612572/
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