In article jJmsc.37$Dc5.19@newsfe4-win, Terry D wrote:
I've noticed that a lot of new houses have the old style outside
soil drain stacks, usually in black. They look horrible. Has
anyone an explanation for this? I thought that inside soil drains
were adopted 30-35 years ago.

After the big freeze up of 1962-3 they changed the Regs. Back at that
time all stack pipes were CI so any water running down the inside wall
of the stack would turn to ice and freeze, so to stop this ever
happening again the regs were changed. More recently, as another
poster says, it was decided that with uPVC being universal there was
now no real problem with outside stacks if that's what builders wanted
to do.

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk
Free SEDBUK boiler database browser http://www.sda.co.uk/qsedbuk.htm