Re: Mixing brown/grey 110mm fittings



The pipework for solid waste removal should be as short as possible. Any bends or other obstructions should be kept to the minimum. For every bend you place in the pipe the flow level increases by another 10mm over the full length of the pipe, not just the pipe up to that point. So this means, as an example, that a full length of say 4 mtrs from a pan to the main stack will need a drop, over the full length, of 40 mm over a straight run. If a 90 degree bend is introduced half way along, the drop will then have to be increased to 50 mm over the full length, even though the original length between the pan and stack hasn't changed.
Isn't there an alternative route to take for the new pipework ? I'd much prefer you to take a soil pipe over the shortest route possible, even if it means you knocking a couple of holes through internal walls to keep the pipework as straight and as short as you can.
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