Tommy Gilchrist wrote:

One question. I'm sticking the toliet beside an external wall with
easy access to an existing soil pipe. However the joists in the floor
run parallel to the external wall and there's one tight against the
wall.

I assume this means the soil pipe will have to go through the wall
above the floor level? Will the smaller waste pipes i.e. from the bath
and basin be able to go through the joists - they're about 200mm deep.

Your toilet probably has a horizontal outlet anyway - designed to be
taken straight through the wall at a height of about 190mm above the
finished floor level.

The other pipes are probably simpler taken out above floor level as
well. Typically you should not make hole through joists that are more
than 10% of their total depth, although close to a wall, or in cases
where the joist span is relatively short you can.

--
Cheers,

John.

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