David wrote:
The Natural Philosopher wrote in message
...
David wrote:

The new loo will basically be advanced forward from the current
location by about 6 feet, then right about 4 feet, where it will be
in
the middle of the bathroom, against a stud partition (behind which
is
the middle of the old bathroom, soon to be a bedroom). I want to
take
the soil pipe straight back from the loo, through/under the
partition,
and between the new bedroom floor and the ceiling below, parallel to
the joists, and through the external wall, where it will emerge 6
feet away from the old exit point. It will join the soil stack at
the same place as before.

I reckon I'll have enough fall on the soil pipe as it runs under the
bedroom floor; but if not I could always break through the ceiling
below (a kitchen; OK?) which is pretty high and very poor condition,
and could easily take a suspended ceiling 3 or 4 inches lower.

At the moment the bit that most worries me is how to connect the
toilet to the soilpipe under the bedroom floor. Should the loo
have a vertical or horizontal soil pipe exit?; am I likely to be
able to bury
it all in the 4" stud partition and/or under the floor? Are there
ways to do this (other than Saniflow - no thanks!) which I don't
know about? Unfortunately because this is a corner terrace there
is very little outside wall at the back of the house to play with,
so I can't
site the toilet in a corner, which would allow boxing in of the soil
pipe in the bathroom or bedroom. It has to traverse the bedroom in
the middle.

Hope I've explained the problem and the layout clearly! Thanks for
any advice. (Watch for my follow up in a few weeks on ventilation
requirements!)

This was covered elsewhere. You need IMHO a horizontal outlet from
the
pan to get as much height as possible, and an overall run with at
least
a 1:60 slope. I'd advise running basin/bath wastes seperately. Pipe
must
be 4". You are supposed to have a rodding eye where it bends 9o
degrees - essentially outside in your cae.

Thanks NP - yes, I read several threads about this before posting, but
couldn't find anything about my specific issue of going through the
stud partition, in the middle of the room. I'd already worked out
that a fall of no more than 2" across the bedroom should be OK; I
think the problem is really how to get the pipe down through the
partition to below floor level in the first place without encroaching
on the bedroom...

Regards
David

If your partition wall is not thick enough for the soil pipe then obviously
it will have to be external to the wall.
I assume your toilet is to be a modern low level suite and not a hidden
cistern?
If you already have the toilet and the exit is horizontal there should be
enough space between it and the back of the cistern for a vertical pipe with
a 90 deg bend at the top anyway esp if you use a "space saver" coupler.
If you have yet to buy the toilet, consider a vertical outlet one.