Water coming back into shower tray

[plumbed out]

Hello, I have a problem with my bath and shower water pipes. When the bath is emptied the water comes back up into the shower tray! Which is the best kind of non return valve to use? a McAlpine no return valve or a Hepvo or any others? Would fitting one of these non return valves even work? Thanks for any information.

 

[Dotty]

Never mind an NRV. You've got a blocked drain.

 

[ShaunCorbs]

Never mind an NRV. You've got a blocked drain.

+1 or your drain falls arnt right

 

[plumbed out]

I thought it might need a NRV as the shower and bath are connected to the same outlet waste pipe.
I did clear a load of hair out of the pipe, it must be still blocked somewhere else, maybe outside pipe? What's the correct angle for water to flow properly?

 

[ShaunCorbs]

I thought it might need a NRV as the shower and bath are connected to the same outlet waste pipe.
I did clear a load of hair out of the pipe, it must be still blocked somewhere else, maybe outside pipe? What's the correct angle for water to flow properly?

about an inch per m you can go less but i think regs are about 18-20mm per m, but the more fall the better (without going stupid)

 

[Unregistered]

So you don't think I need a NRV?

 

[Ch4 plumbing]

No, either you have a blockage in the waste or the waste back falls to the shower! Has it always done this? Or just started?

 

[Unregistered]

I will try and change the pipe angle, as there isn't much of one at the minute! Thanks for your help.

 

[ShaunCorbs]

I will try and change the pipe angle, as there isn't much of one at the minute! Thanks for your help.

and if you can run separate outlets one for bath and one for shower (1 1/2), if you cant run a 2"
main and t off for shower or bath

 

[Unregistered]

It was fitted about 4 years ago and then started playing up a few months ago.

 

[Ch4 plumbing]

Sometimes if the waste pipe isn't clipped sufficiently over time the hot water can make the waste pipe bow and sediment can cause a blockage, have you tried using a plunger?

Don't go like a man possessed with it but giv that a go.

 

[townfanjon]

Just a thought, if the pipe is and has been level for a few years I would change it and start a fresh .