On Tue, 25 May 2004 11:47:29 +0100, Tony Bryer wrote:

Right that confirms it. The Atlantic Conveyour will switch off in
the next 20 years, meaning that the UK will get the winters it
should for it's latitude...

But that's still unlikely to cause to a problem with a uPVC stack
IMO. Imagine a 6m CI stack sealed at the bottom, temp -5C

If the Atlantic Conveyor does switch off -5C will be warm during the
winter think, Moscow, think -20C or lower...

... and tip in a basin full of warm water.

It's not so much large quantities warm used water as the dripping tap.
Back in the early 80's I had the waste from the bath and wash hand
basin freeze in Bristol. That was PVC waste to the stack not sure what
the stack was or where the blockage was but it took a week to clear...

--
Cheers
Dave. pam is missing e-mail