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Air-lock in basin waste

Redbeard
in Waste & Sewerage

Featured Replies

My bathroom wash-hand basin waste (which has worked pretty well for the last 2 years with only the odd ‘plunge’) seems to be air-locking. I have had most of it apart and it all seems clear but once I put it back together again it does not run away. The waste pipe currently runs down through the bathroom floor, horizontally along above a false ceiling in the  room below and then down the wall a little further via one ‘down’ and one ‘out’ elbow, to the SVP. I don't really know what the problem is that I'm trying to cure, but I wonder whether I could simplify it by running the waste to the short spur of horizontal soil pipe running from the WC to the SVP In the bathroom. I suspect I would also need an AAV, and if so is that OK to go on a T just before the connection to the horizontal soil pipe? Inept sketch attached. Any advice gratefully received.

DSCF7417 - Copy.JPG

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