wash m/c plubing into soil pipe

[joey1522]

is it possible to plumb a wash m/c waste straight into a soi

pipe.....you know the big one that goes all the way vertically up sid of house....if so do i need to add a u bend at all to get rid of smells...sinks and outside drains too far away and unreachable withou a LOT of wall chasing....cheer

-- joey1522

[John Rumm]

Assuming the soil pipe is plastic, then yes it is easy enough.

Start with a 40mm pvc stand pipe fixed to the wall, with a trap installed at the bottom. The hose for the washer hooks over the open end of the pipe. Do not seal the pipe to the hose - it should allow air in, otherwise you may syphon water out of the washing machine. Also check the instructions for the machine, since it may specify a maximum and minimum height for the waste pipe.

From there carry on in 40mm pipe through the wall until you get to the soil pipe. The building regs will give you a suitable fall to put on the pipe. See here:

connect to the soil pipe using a "strap on boss" (these require you to drill a hole in the side of the pipe and then place the boss over the whole before doing up its strap. You can then connect your waste pipe directly into the boss.