WC waste bends

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I'm in the process of planning an ensuite and am struggling with the siting of the WC.

We'll be partitioning off the far end of the bedroom making a room 3m x 1m, so the plan is to have the WC with it's back to one of the short walls, giving a decent amount of legroom.

This would mean that the waste would exit the back of the WC, turn right 90 degrees, travel around 0.5m then out through the wall, but would then have to turn 90 degrees again to go to the soil stack.

I have done some reading and cannot find a definitive answer on whether this will work or would pass building regs. I'd rather be 100% sure it would work so my only thoughts are either -

1) turn the WC round so it's back is to the long wall, meaning only one 90 degree turn on the waste but legroom of only 0.4m, not really desirable

2) leave the WC on the short wall but buy a WC with the waste spigot on the right rather than the back, again only meaning one 90 degree turn when it goes through the wall (not sure if this would still count as two turns though?)

Other points I should mention -

- The long (outside) wall is taken up on the left hand side by a window, so the WC has to go on the left side with the shower on the right hand side

- We may also be moving the WC in the main bathroom adjacent (through the short wall to the left of the ensuite) which would mean both WC's going into the same stack (another can of worms I know!).

If we do this, the plan is to have one horizonal pipe on the outside, with both WC's discharging into this pipe from above, which would then connect to the stack over a suitable fall.

Would this make a difference in terms of my original problem, as it would mean that the waste would turn over a wider radius?
 
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This would mean that the waste would exit the back of the WC, turn right 90 degrees, travel around 0.5m then out through the wall, but would then have to turn 90 degrees again to go to the soil stack.

No issue - providing you have sufficient fall.

one horizonal pipe on the outside, with both WC's discharging into this pipe from above,
Not a great idea - better to have first one entering on a 92.5° bend http://www.screwfix.com/p/floplast-sp169-92-5-access-bend-black-110mm/63713with a rod access port and the second on a branch http://www.screwfix.com/p/floplast-sp190-92-5-branch-black-110mm/29610 (again providing you have sufficient fall)
 

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