Two separate shower traps?

[Cranbrook]

Currently doing a few bathrooms in a high end new build, and the water pressure and flow rate are both very high, and the customer is adamant he wants the showers as powerful as can be... my concern is that if I screed in only a single waste, its not going to cope, ive seen a few companies do double or triple traps on one waste, but has anyone ever put two separate wastes in one wet room?

 

[Waluigi]

I’ve installed Linear drains with two traps, I think it was an impey Dec.

 

[Waluigi]

Just to add, calculate the flow rate of your showers vs the flow rate of your traps. Some traps are better than others at letting water pass through them quickly

 

[Cranbrook]

Just to add, calculate the flow rate of your showers vs the flow rate of your traps. Some traps are better than others at letting water pass through them quickly

Unfortunately the showers aren't in yet so it's a bit of educated guess work at present

 

[WetSaw]

Waste flow is ultimately limited by pipe size. If that is already in place then you can only fit the highest flow trap that you can find.

 

[Waluigi]

Just had a quick look at some wastes- ranges between 40 to 60 litres per minute on the couple I looked at.

60 litres.........That’s a lot of water.

 

[Cranbrook]

Waste flow is ultimately limited by pipe size. If that is already in place then you can only fit the highest flow trap that you can find.

I can add an extra waste pipe in atm

 

[Waluigi]

I agree with PDC, it’s always best to add a 2” (50mm) waste instead of relying on 1”½(40mm) that is often already in place.

Edit: it’s also worth noting the maximum pipe lengths and gradients for your wet room. All of this data can be found in Part H:-

https://assets.publishing.service.g...achment_data/file/442889/BR_PDF_AD_H_2015.pdf

 

[WetSaw]

All depends on whether you're using formers or trays and what your options for traps are. 50mm pipe will obviously have more flow than 40mm and if you can run 2 separate ones to the soil stack ( not 2 into 1 before the stack) even better.

 

[Cranbrook]

All depends on whether you're using formers or trays and what your options for traps are. 50mm pipe will obviously have more flow than 40mm and if you can run 2 separate ones to the soil stack ( not 2 into 1 before the stack) even better.

Yeah I can run two straight in to the stack and that's my current thought, I'm going to screed the trap/traps in

 

[Ajax123]

The traps ability to get rid if waste is not just down to pipe size. It also depends on the trap entry not becoming air locked. I found this when I installed my own shower. I put a standard floor waste in with a 50mm pipe outlet yo a shallow p trap. It kept bunging up because the shower out water ok top faster than the it could get into the trap entry thus air locking and overflowing. I ended up changing the trap to one called a fast glow trap which as the water enters the trap it creates like a vortex stopping any air lock. Now works a treat.my shower is rated at 40litres a minute when on the pump...

 

[Qwerty]

As Alan says above, a fast flowing trap is all that is required. Are you running a combination boiler or conventional tank & cylinder?

 

[Waluigi]

..........or Unvented......or Thermal Store.

 

[Cranbrook]

Its an unvented system (two boilers in a low loss header system. I don't think a fast flowing trap will be sufficient given the flow rate, so I think I'm gonna screed in two separate drains and run separate 40mm waste