Air admit valve or exterior vent? Posted: Apr 26, 2007 12:17 PM Reply
Hi, the regs say I can fit an air admittance valve on the end of my soil stack vent. The soil pipe has an horizontal run inside the roof space of a ground floor extension. This would save be making a hole in the extension pitched roof for an exterior vent. This relieves negative pressure but not positive, so are there any big disadvantages to doing this? Thank you
Provided it meets the regs - by being not more than the specified maximum distance from the nearest fully vented stack - there's no problem. I've had one in the roof-space of my extension for 12 years or so, and it's fine.
Alternatively, run the soil vent horizontally through a gable. Put a slight reverse U bend in it to prevent condensate building up inside.
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