I'd get it out of the way, presumably you're having a bit of eaves overhang on the roof and a lead flashing where it abuts the wall you'll need space for those. You could probably get away with bashing a few bricks/blocks out from the inner skin in the bathroom to get the pipe out past the bath. I don't know how permanent those waste pipes are but you're asking for trouble with all those bends in them.
Hi,the bends were always just temporary,think my plan of action for now is long Flexi connector, continue with the wall and roof ,then bite the bullet and core through side of wall and connect up,at least then all out the way for nice job,coping stones right to wall.Have the core drill at work so should make easy work connected to vac.
Had a builder around earlier,quoting for rsj's. He stated I could run the timber joist inside rsj and bring ceilling height down avoiding messing around with stack,just divert pipe to the left...does this sound a good idea??? IV been reading you can insert the timber plate into rsj then use joist hangers
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