Old bathroom has bath, shower, bidet and basin all draining connected
to a common 32mm waste. When the bath is emptied, basin and bidet
gurgle loudly and the shower tray fills with water.
I'm replacing all this with 40mm but need some advice for layouts. All
ground floor. Drop to exit about 6" below floor, easy access from
I think I can stop gurgling by replacing the piddly slimline S-traps
with beefy P-traps, does that sound like it'll work? AIUI, it gurgles
because the outrush of water from the bath causes a vacuum. I've never
seen one, but it occurs to me that an air inlet valve (in 40mm,
basically a flappy bit of rubber) might help? Or am I completely
Is it realistic to expect no water back into the shower tray? Is
putting a seperate drain just for the shower a good idea?
Not looking for shortcuts. Don't intend to move so want this done
Simon Avery, Dartmoor, UK
uk.d-i-y FAQ: http://www.diyfaq.org.uk /
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