I am converting a bedroom into bathroom and I am trying to work out a
way of connecting the bath waste to the soil stack without any pipes
showing.

I would like to run the waste pipe between the joists, through a wall,
then add a 90 degree turn. This latter section will run along the wall
and connect to the soil stack. There is a snag, to get the latter
section to connect without disturbing extension roof tiles and flashing
it will need to be at a gradient so that it falls 50cm in 1.5m length.
This is a steep gradient and I am concerned that I shall end up with
syphoning or slow draining problems.

================================================== ====
Can anyone advise whether this scheme will work and meet building regs
or come up with an alternative? Could this scheme work if an air
admittance valve was used?
================================================== ====

Full details a
Soil stack internally vented via durgo, connected to a run with open
vented stacks up slope.
Bath waste 40mm pipe, first straight run (between joists) is 3m long
and can have 18-40mm fall.

Thanks for your help in advance!

On 13 Mar 2006 13:09:24 -0800, "H-S" wrote:

|I am converting a bedroom into bathroom and I am trying to work out a
|way of connecting the bath waste to the soil stack without any pipes
|showing.
|
|I would like to run the waste pipe between the joists, through a wall,
|then add a 90 degree turn. This latter section will run along the wall
|and connect to the soil stack. There is a snag, to get the latter
|section to connect without disturbing extension roof tiles and flashing
|it will need to be at a gradient so that it falls 50cm in 1.5m length.
|This is a steep gradient and I am concerned that I shall end up with
|syphoning or slow draining problems.
|
|================================================= =====
|Can anyone advise whether this scheme will work and meet building regs
|or come up with an alternative? Could this scheme work if an air
|admittance valve was used?
|================================================= =====
|
|Full details a
|Soil stack internally vented via durgo, connected to a run with open
|vented stacks up slope.
|Bath waste 40mm pipe, first straight run (between joists) is 3m long
|and can have 18-40mm fall.
|
|Thanks for your help in advance!

Mine has a slope much greater than that, had no problems at all. Bath
wastes run only partially full so siphoning is impossible if there is a
continuous fall. Someone else will remember how far away the bath waste
must be from the toilet junction to the soil stack.
--
Dave Fawthrop dave hyphenologist co uk
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