Dave wrote:

That's useful info, is it the same for all wastes (loo, basin, etc) and
pipe sizes (50mm and 100mm)?

Have a look at building regs approved document H, that has loads of info
on all sorts of sewage and water drainage etc.

http://www.odpm.gov.uk/stellent/grou...pdf_600283.pdf



--
Cheers,

John.

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