Advice on bath waste with vertical drop?

[Hawkeye63]

Hi, first timer here seeking advice on routing a bath waste.
Have to say this is a great site full of good advice & tips.
To avoid using the existing unsightly boxing leading to the soil stack I would like to route the waste to an outside drain.
It would need to go from the bath trap 1m horizontally, then 2.5m vertically, then 0.5m horizontally. Unfortunately the floor joists run the wrong direction to be a simple route under the floor!
I can see two potential pit-falls;
a) the water seal lost by the vacuum effect (could this be solved by an anti-syphon valve?),
b) will the drain handle the rate of water? I suppose I could test this by pouring a large volume of water down the pipe into the drain?
Any advice would be greatfully received.

 

[plumber0808]

Run it outside in the correct size. Fit a gutter hopper up at high level that drops down vertically to the drain and pop your bath waste into the top of that.

 

[cr0ft]

http://www.planningportal.gov.uk/uploads/br/BR_PDF_AD_H_2010.pdf

This document should tell you everything you need to know for running wastes. As long as you comply with the design instructions within you shouldn't have any problems.

I take it the soil stack is internal then?

The drain should be more than capable of handling a discharge from a 40mm waste pipe, unless it's blocked that is.

 

[Hawkeye63]

Yes it is inside but across the other side of the room.
Many thanks, I'll have a read.

 

[GaryM21]

Use a Hepvo self sealing trap instead of a traditional bath trap. You can buy one from most good plumbing merchants. It can be connected directly to the bath waste using a knuckle adaptor ( purchased separately ) or in-line in the waste pipe. It can't have the water sucked out of it because it doesn't contain any. There is a rubber valve inside like the neck of a balloon that allows waste water to flow out but then self seals stopping anything from coming back. I have them on every waste in my house, never had a blockage, never suffers smells like you can get particularly from traditional kitchen traps that get a build up of grease & waste food.

 

[Hawkeye63]

Thanks for the suggestion. I've had a look online & it appears to be the answer to the problem. Cheers!