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Ok thanks and 3m is max for 40mm?

I read that for 32mm waste that the max distance is 1.7m is this assuming a 18mm fall per metre? I need to run a basin waste approx 3m but the pipe will run at around 35⁰ down to soil pipe. (Solum is huge) this doable?

I want the pipe to be hidden though as shelf mounted sink going in. So pipe somehow has to get to the other side of the joist and run up the other side of the wall.

What would the plumbers do here? I need to get the waste up the back of the wall rather than up through the floor. Access at back of wall is easy, lots of room in the solum. Problem is I have a double 5x2 joist underneath the wall between waste pipe connection in main soil pipe and where I want...