"Ian" wrote in message
...
Hopefully someone can give me some advice.......

I need to get a waste pipe past a dish washer. The only way I can get the
pipe past the washer and have the washer far enough back to sit flush with
the units is the chase the wall out and sink part of the pipe partly into
the wall.

The wall is constructed of grey bricks approx. 22x7 cm. (Don't know the
depth). Can anyway advice me if this is a bad idea and if not how deep I
should chase the wall out without *any* risk.

The washer has a recess at the bottom for running pipes but this is
actually 10cm lower than the inlet into the main waster pipe in the
flats!, so unless anyone knows how to make water run upwards is chasing
the wall out my only option.

Thanks in advance.


You need to refer to Building regulations document A (downloadable from the
government website )
http://www.odpm.gov.uk/stellent/grou...hcst?n=240&l=2

an extract is here -
2C30 Chases:

a. vertical chases should not be deeper

than 1/3 of the wall thickness or, in cavity

walls, 1/3 of the thickness of the leaf.

b. horizontal chases should not be deeper

than 1/6 of the thickness of the leaf of the wall.

c. chases should not be so positioned as to

impair the stability of the wall, particularly

where hollow blocks are used.



Dave