Michael Chare wrote:
I plan to install a new upstairs bathroom toilet, basin and bath. All
three items will be on the same exterior wall. The basin is between the
bath and the toilet.

If I connect the bath drain to the toilet soil drain pipe, outside just
below the bath, a distance of about 8 foot, how much slope do I need?

Is it OK to connect the basin drain to the middle of the above pipe or
should I have a separate connection to the soil pipe? The latter option
would certainly prevent any water from the basin trying to enter the bath.


at least 1:100 1:60 is better, and more is OK but watch out for TOO big
a flow actually sucking the U bend an trap dry. Or add an air
admittance valve to it

If you can guarantee that only water is going down it and not solids
that might collect it needs no slope at all. It can even go up - its
just another U bend then :-)


--
Ineptocracy

(in-ep-toc-ra-cy) €“ a system of government where the least capable to
lead are elected by the least capable of producing, and where the
members of society least likely to sustain themselves or succeed, are
rewarded with goods and services paid for by the confiscated wealth of a
diminishing number of producers.