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- The vertical part of the soil pipe from the toilet in our 1st floor toilet is in an awkward spot. - There are no toilets above this toilet and there is no outside venting. There is a an internal air admittance valve. - We want to move the vertical part of the soil pipe and the AAV from one...

think there will be a small fall - think the requirement is 1cm fall for every 40cm of horizontal?

It would be inside -> outside -> inside

Yes, with my proposal I'd be taking the pipe external, then returning it to the inside to connect to the existing stack.

Not possible because of the space between the outside wall and door when opened. Also there’s a window on the outside wall which would interfere with where the concealed cistern goes.

Here is a drawing of the proposed layout. Toilet will have concealed cistern. The main reason we are doing this is so we can fit a double vanity on the wall opposite the door. Thanks!

Thanks - the horizontal plane would still have the necessary fall - do you still think having 3x bends is problematic?

We are relocating our toilet. The soil pipe connecting the toilet (in its new position) and the vertical soil pipe will need to have 3x 92.5 degree bends on the horizontal plane (the overall horizontal soil pipe length will be about 2.5m and would have a fall of 1cm for every 40cm). Is this...