Tom wrote:
News wrote:

"Tom" wrote in message
...

What's the minimum size I can get away with for a stack
ventilation pipe on a single storey dwelling, it serves only for
ventilation. It used to be 75mm but I haven't got access to the
latest approved documents.

Sure you do:

http://tinyurl.com/qjn7 or
http://www.odpm.gov.uk/stellent/grou...hcst?n=240&l=2

Use HepVO traps and no vent pipe at all.
http://www.hepworthplumbing.co.uk

This is the main stack and is located external to the building, it's
not a secondary stack. I don't think that the Hep VO traps apply,
please advise me if you think the statement incorrect.

Depends on various factors, eg whether next door already has an external
stack: read this thread (and lots of others) from the uk.d-i-y archives
for more info about it: http://tinyurl.com/6zpos

David