BigWallop wrote:

What else is connected to the stack. Soil pipes are normally 110 mm (4'') so
the remaining stack above the WC branch may only be venting pipe to above the
roof. That is unless you have other appliances like baths and basins connected
above the WC branch.

There's nothing else on the stack, the bath and basin have a separate pipe.


If there is nothing else on the stack then all you need is smaller diameter uPVC
pipe. They come in the same sizes as cast pipe so you should be able to pick it
up at B&Q.

Ah, didn't realise, I thought only 110mm was available. And I was in the
Parkhead B&Q last night too. Blast.

My basic problem is that I'm replacing the WC and the outlet from the
new one will be higher than the old one - I've worked out that the
vertical distance between the centres of the outlet and the existing
soil pipe will be about 90mm, and the horizontal distance between the
ends of the pipes about 105mm. I can't seem to find a pan connector to
fit that. The flexibles ones all seem to require a minimum distance
greater than what I'll have (about 140mm in a straight line, I think).

So I thought it was probably time to replace the CI soil pipe and
connect the PVC replacement through the (wooden) wall a bit higher up to
make connection to the WC easier.
--
Steve Loft