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I'd like to know why there appears to be no water in the u bend under the shower tray? Is there a leak?
A similar question was asked a few months ago about toilets - I'm not sure if I've a similar problem here. The shower room is downstairs, another bathroom upstairs, and no problems anywhere else (kitchen, washing machine, etc.) Last year the builder fitted a nice stone cover around and over the outside drain, which the shower pipe under the shower tray goes into - since then, we've noticed we can hear other water draining through the pipe (when the washing machine pumps out, for example, the kitchen is the next room along from the shower room), and there is no water in the u bend. So, it could be the drain? How? Why? Or could something have happened under the shower tray, and if so what? The system is about 11 years old, and the original builder put the tiles on round one side of the tray with silicone sealer so they're relatively easy to shift (I hope!).
Has the stone completely sealed over the outside drain? If so when water drains out and into the drain it could cause air pressure in the pipe and cavity to drop, potentially enough to drain a shallow shower trap by sucking the water through.
Alternatively the stone cap may not allow the sound of running water to escape into the environment and the sound waves may reverberate in the pipework more.
If the shower trap is draining because of the new stone then you may need to add an air inlet to one of the vertical downpipes higher in the system. This will ensure air is reintroduced to the system after water has run through it and no pressure drops will be experienced to suck the water from your shower trap which I presume is the lowest and shallowest trap.
The air vents are easy to install and are very cheap, (about £5 from Wickes in UK), just cut a section from the waste pipe and fit the inlet the right way up using compression couplings.
I had a similar problem in my bathroom and this cured it. It is certainly worth trying before you rip out tiles and a shower tray.
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US $499.00




