Hi All

Still trying to make some sense of the venting arrangements for my
drains in order to make the local Building Control bods happy and get
that all-important Completion Certificate.

So - I have a septic tank down at the bottom of the garden - and a
long-ish pipe run down to it. At the highest point there's an
earthenware 4" pipe which looks as if a 4" plastic vent pipe once went
straight up inside the bathroom and out through the roof.

Since then, a previous owner has removed the vent pipe and replaced it
with an air-admittance valve, at floor level.

Building Control want to see the AAV removed and a 'real' vent open to
the air reinstated.

Because it's in a very obvious position (in an alcove with the
washbasin / large mirror etc) I'm keen to make the whole thing look as
unobtrusive as possible. Apparently I can go from 4" to 3" pipe once
I'm above the level of the basin overflow - this will help a little
with the appearance and getting the inevitable boxing-in to be as
close to the wall as poss .

Because it's not easy catching up with the Building Bods as they're
apparently understaffed and running about on sites all day - I'm
asking here g

So - a few questions :-

a) Is it possible to get an offset adapter to go from 4" to 3" -
"in-line" ?
b) Am I going to have problems obtaining 3" pipe & fittings ?
c) Can the pipe pass out through the gable end of the bungalow (I know
about the restrictions re opening windows) - or does it have to go out
through the roof ?
d) If it goes through the roof - is this just a matter of removing a
concrete tile and fitting one of those
'ali-sheets-with-a-rubber-collar' efforts - does the ali sheet replace
the tile ??

Many thanks in advance
Adrian
Suffolk UK
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