I want to add a downstairs loo. Is there a minimum height on the vented
stack that I can connect to ? If so, what is the height with reference
to - the ground level / bottom of sewer etc ?
Simon.

450 mm above foot of stack (invert level) if less than 3 storeys
Just checked on ODPM, 3 storey can be 450mm, it's over 3 storeys when
it must be increased. So if you do a loft conversion, you need no
change your downstairs loo connection !
Simon.

The message
from contains these words:

I want to add a downstairs loo. Is there a minimum height on the vented
stack that I can connect to ? If so, what is the height with reference
to - the ground level / bottom of sewer etc ?

450 mm above foot of stack (invert level) if less than 3 storeys.

Is that just for toilet pan connections or does it also apply to sink
wastes as well?

--
Roger Chapman

In article , Roger
wrote:
Is that just for toilet pan connections or does it also apply to sink
wastes as well?

It's a general rule. Stuff coming down the stack fast tends to bounce
when it hits the bottom ... need I say more?

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk
Free SEDBUK boiler database browser http://www.sda.co.uk/qsedbuk.htm
[Latest version QSEDBUK 1.10 released 4 April 2005]

The message
from Tony Bryer contains these words:

Is that just for toilet pan connections or does it also apply to sink
wastes as well?

It's a general rule. Stuff coming down the stack fast tends to bounce
when it hits the bottom ... need I say more?

I asked because I have (have had for 20 years or more) a connection that
goes into the soil pipe immediately above the the bend. So far I haven't
had a blockage there but I have thought for some time that the situation
was less than ideal.

The basic problem is that the main drain reaches the house a foot or
more above kitchen floor level so I don't have any room for manoeuvre.
The main drain only has a rodding eye in it so it looks as though the
only way out would be to construct a shallow manhole at that point and
plumb the waste directly to that.

--
Roger Chapman