I am currently re-modelling my bathroom. I have had a combi boiler installed
and therefore have been able to remove the airing cupboard from the bathroom
and am replacing it with an offset quad shower cubicle.
The bathroom is almost square and, looking with a 'bird's eye view', the
soil-stack is in the lower left corner with the w.c. connecting directly
into it. Along the left wall lies the bathtub and in the top right hand
corner and partially down the right hand wall will be the shower cubicle. On
the 'top' wall, between the shower and the bath is the wash-basin.
The waste from the shower, wash-basin and bath all link together and drain
into the soil stack. Down the left wall is no problem because the drain runs
under the bath and is hidden behind the bath panel. The problem is along
the top wall because I will have to run the waste from the shower along the
top wall, under the wash-basin where the wash-basin drain joins it, and then
under the bath. I cannot run the waste below the floor because the joists
run in the 'wrong' direction.
I don't particularly want to have the waste from the shower running along
the bottom of the top wall to the bath and 'boxing it in', and am
considering 'chasing' it into the breeze block wall. The breeze blocks in my
house are like chalk - you can dig pieces out with your finger-nail, so the
actual digging out of a length to bury the drain would not pose any
difficulties. What I am concerned about is the depth of 'slot' that I would
have to cut to bury the 40mm waste pipe.
The horizontal distance that the pipe would have to be buried in the wall
would be around 800 cm but several breeze blocks would be cut into for at
least half their thickness. Anyone have any comments upon how wise it would
be to cut so deep into a breeze block inner wall? The wash basin is a
suspended type with a stainless steel trap cover but I would also need to
bury part of the down-pipe from the basin into the wall to enable it to join
up with the buried horizontal drain from the shower.
Shame it isn't a stud wall!