In an earlier contribution to this discussion,
Martin Carroll wrote:

I am going to be putting a toilet under the stairs of the house I am
renovating and am puzzling a little over the connection into the
drains.

I probably need to discuss the options with the BCO but was wondering
if it is possible to join it into the existing soil stack!

The house is a Victorian terrace and the current situation is that the
main sewer pipe runs along the back of the houses (ours is third in
line of 6) and the only current connection into the drain (as viewed
from the inspection chamber) is the main soil stack. I haven't
excavated around the bottom of the stack yet but there are also an
old (outside) WC connection which branches straight into the sewer
pipe outside of the IC and a rainwater gulley which does the same on
the other end of the IC.

there is a diagram and photo at http://www.engelside.co.uk/toilet.htm

The original toilet is going and the wall between the kitchen and
conservatory is too.

I don't particularly want to start making major changes, building new
IC's if it at all possible so I was hoping that I could run a
connection from under the stairs to the bottom of the soil stack.

Any views?

Cheers

Martin

I'm not clear just where your new toilet is going. I assume it's on the
ground floor, somewhere near the stairs? Is it a suspended wooden floor
downstairs, and you want to run the pipes under it? Or are the floors solid?

From the photo, it doesn't look as if you've got much vertical height to
play with to get a suitable fall. The stack looks as if it goes into a clay
pipe - then straight into the IC so there's no real possibility of
connecting there.

The toilet which you're removing presumably has a clay pipe under the floor?
Couldn't you cut off the upturned bit of that and connect your new toilet
into the horizontal bit?
--
Cheers,
Set Square
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