we have a 2nd loo, which (I presume) has a 3m server pip running into
an inspection chamber, and thence down the road.
I was wanting to put a drain for an outside tap on the wall by the
loo, and run a full 3m pipe into the inspection chamber ....
any reason why I can't break into the sewer pipe and fit a join (with
suitable U-traps or whatever) ?
From the loo out to the manhole is a straight run without any branches
already connected to it ? If it is, then you can install a branch to it as
long as it is taken from the top on the straight run of pipe. This is to
prevent back-flow of soiled water into the surrounding area.
It sounds worse than it is because it sounds complicated, but all it means
is that when you fit the tee branch to the straight run, you point the
branch upward and connect two bends to it to point it back down on to your
"U" trap in the ground. The reason it's done like that is stop all the poo
running straight into the bottom of the trap and lying there sticking the
place out. The trap itself, I think, has to be something it region of 250mm
to 300mm deep to stop the back syphon action from the loo running, but
making it from bends and a straight section to the ground inlet grille is
easy and cheap. The only thing you need to watch out for, is that it
doesn't run dry because it isn't used all the time, and the thing will stink
to high heaven when it does. With all the rain we get in the UK this is
never really a huge problem though.
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