what is the correct fall for 32mm 40mm &100mm waste pipe please
correct fall ratio ?
- Thread starter addgason
- Start date
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ironman1
1 in 40.
The minimum slope for an un-vented branch line in all cases is actually 18mm/metre which equates to 1:55 but the accepted rule is 1:40 which equates to 25mm/metre & it’s advisable not to go below that. The foul drain size is 110mm not 100mm.
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