On 07/08/2018 08:47, Tim Lamb wrote:
The chalet bungalow upstairs bathroom.

Are there likely to be any issues with arranging a short 45 deg. fall in
the toilet waste pipe?

The current plan is a vertical outfall terminated at a manifold above
the soffit. There is insufficient space to get this high enough to
accept a full *horizontal* run. Probably 2m level, 45 deg. bend, 800mm
and another 45 deg. to the manifold.

Our second toilet exits through the wall, turns 90° and then immediately
descends at 45° for about 800mm, before changing again to a normal
"horizontal" run. There was no choice, as there was a window half-way
down the stairs, between the toilet and the stack, preventing a straight
run. It has worked fine for 9 years now, but from the outside, it is
quite a bit noisier than the pipe from the other toilet.

SteveW