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Bathroom Fitting

How far away can a toilet be from the main waste stack in communal flats?

Anonymous user 03/03/2024 - 3.23 PM

Hi, I live in a third floor flat with a main bathroom waste pipe that services 4 flats. I'd like to try and redesign the layout of my bathroom but I'm not sure how far away a toilet can go from the main waste pipe? At the moment it's plumbed in right next to the main waste. Is this to avoid the chance of leaks from longer pipework? Also if you run long, horizontal pipes from your toilet will the waste get stuck part way? The furthest the toilet would be away from the pipe is 2metres due to the size of the bathroom. I'd also have to keep all pipe work above the concrete floor and accessible in some way in case future plumbing work is needed.

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5 Answers

AJH Plumbing Worcester

Rating: 5 out of 5
Worcester
so long there is adaquate fall the max run is 6m for a waste pipe.
Answered6 July 2019
14

Next Generation Tiling Services

Rating: 5 out of 5
Palmers Green, London
Six metres is the maximum run according to Building Regualtions, but as you have realised yourself, a good fall on the branch pipe is essential. 2.5º, or 44mm fall for every metre run, is the usual standard. IIRC it is permissible (but inadvisable) to go as low as 18mm per metre, the maximum is 90mm per metre.
Answered21 July 2019
3

BONUM CONTEMPORARY CONSTRUCTION LTD

Rating: 5 out of 5
Dartford
You will need a minimum fall in the soil pipe of 1:80 from the pan to where it enters the main stack and possibly and air admittance valve
Answered7 July 2019
1

Anonymous user

As long as the pipe have at least 15% downhill slop from Toilet to main waste pipe it would be ok. Any distance up to 3m do not require extra joining points as standard 4inch waste pipe is 3m long. That is how manufacture made it. You can buy shorter too but 3m long is no problem to get.
Answered8 July 2019
0

Haighs rapid plumbing

Rating: 5 out of 5
Brighouse
What do you do if the run is longer than 6 m ? Do you have to have a macerator ?
Answered26 June 2021
0