Hi and apologies if this is covered elsewhere.
I have a long ( unavoidable) 40mm waste running from my shower. The shower is fitted with a "high flow" waste connected to a flexi- hose then into 40mm standard waste pipe.
The whole waste is about 5 metres long and has adequate fall i.e about 25mm per metre. The shower is at right angles to the waste pipe but I have swept the bend by cutting the wall out and curving the flexi-hose nicely.
About 2 metres from the shower a basin tees into the waste and again after about another 2 metres a bath tees in then the whole lot dumps into a trap via a big rubber bung seal to the house sewer.
Heres the rub, sometimes the shower drains fine and fast (after much gurgling and after about 15 seconds) other times it doesn't drain fast enough and the shower tray fills.
I guess that there is air or back pressure in the system.
How do I solve this please?
I have a long ( unavoidable) 40mm waste running from my shower. The shower is fitted with a "high flow" waste connected to a flexi- hose then into 40mm standard waste pipe.
The whole waste is about 5 metres long and has adequate fall i.e about 25mm per metre. The shower is at right angles to the waste pipe but I have swept the bend by cutting the wall out and curving the flexi-hose nicely.
About 2 metres from the shower a basin tees into the waste and again after about another 2 metres a bath tees in then the whole lot dumps into a trap via a big rubber bung seal to the house sewer.
Heres the rub, sometimes the shower drains fine and fast (after much gurgling and after about 15 seconds) other times it doesn't drain fast enough and the shower tray fills.
I guess that there is air or back pressure in the system.
How do I solve this please?