The bathroom re-fit is about to move from plan to implement but I still
have a couple of questions:

Can I run the toilet soil pipe between the joists to the SVP? what's the
minimum fall/slope? Is there any type of pipe that would make this easier?

I'm going to sit the shower tray on the floor (bedded on marine ply and
mortar?) and run the waste between the joists too. Is there any reason
not to join-up with the bath waste before the SVP? Is there a shower
waste that can be cleaned from above? Is there any point using one of
these "vortex" shower wastes? What's the minimum slope?

I want to run the basin waste in a new stud wall but it's going to be a
real pain to drill the (big) holes in all the studs, the alternative is
to saw (big) notches once it's built. Is there a narrower pipe that
people use in these circumstances?

--
Dave S

"Dave" wrote in message
...

The bathroom re-fit is about to move from plan to implement but I still
have a couple of questions:

Can I run the toilet soil pipe between the joists to the SVP? what's the
minimum fall/slope? Is there any type of pipe that would make this easier?

I ran a basin waste pipe with no fall over about 6 metres and never had any
probs.

Rgds

Andy R

"Andy R" wrote in message
...

"Dave" wrote in message
...

The bathroom re-fit is about to move from plan to implement but I still
have a couple of questions:

Can I run the toilet soil pipe between the joists to the SVP? what's the
minimum fall/slope? Is there any type of pipe that would make this
easier?

I ran a basin waste pipe with no fall over about 6 metres and never had
any probs.

Rgds

Andy R


My loo pipe had to be exposed, so I built a shelf around it and tiled it,
very useful.
All my waste and water pipes are concealed, the bidet, basin and bath wastes
all run to a single pipe that goes into the stack, after coming round a
corner and dropping a foot. I had to add a vertical pipe that rejoined the
stack to admit air or I got a siphon effect that made the other waste pipe
glug when you emptied the bath or the basin/bidet. As long as you have a
continuous fall of as much as practical there will be no problems,
completely level or even worse a dip in the middle will give you stinking,
blocked pipes. I got the shallowest shower trap I could find and put the
shower tray as high as practical. You can get flexible waste pipe that
might help your basin problem, but why cant you bring the waste to the
floor? or have you got a non pedestal basin?.

mrcheerful

mrcheerful . wrote:
...snipped

I got the shallowest shower trap I could find and put the
shower tray as high as practical. You can get flexible waste pipe that
might help your basin problem, but why cant you bring the waste to the
floor? or have you got a non pedestal basin?.

mrcheerful


It probably will be a semi-pedestal, but even if I dropped to the floor
the waste would need to run through all the joists, whereas if I put it
in the stud wall I can drop gently to the end and then turn left into
the SVP.

--
Dave S
(The return email address is a dummy)

mrcheerful . wrote:

glug when you emptied the bath or the basin/bidet. As long as you have a
continuous fall of as much as practical there will be no problems,

The maximum fall should be no more than 90mm / meter (and no less than
18mm). This is to prevent the siphoning problem that you observed, and
also to stop the water flowing away too fast and in the process
depositing any solid matter that was flowing with it.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

Dave wrote:

Can I run the toilet soil pipe between the joists to the SVP? what's the
minimum fall/slope? Is there any type of pipe that would make this easier?

You can, between 18 and 90mm / meter according to the building regs
document.

I'm going to sit the shower tray on the floor (bedded on marine ply and
mortar?) and run the waste between the joists too. Is there any reason
not to join-up with the bath waste before the SVP? Is there a shower

so long as there is not a large vertical displacement between them all
then no.

waste that can be cleaned from above? Is there any point using one of
these "vortex" shower wastes? What's the minimum slope?

You can get some there the grate and inner section of the waste can be
removed from above. This gives you some access to clean or retrieve
stuff from the trap.

I want to run the basin waste in a new stud wall but it's going to be a
real pain to drill the (big) holes in all the studs, the alternative is
to saw (big) notches once it's built. Is there a narrower pipe that
people use in these circumstances?

34mm is the minimum for a basin IIRC. Aside from the weakening of the
studs (which may not matter if the wall is only a partition), a hole saw
will do the job easy enough.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

John Rumm wrote:
mrcheerful . wrote:

glug when you emptied the bath or the basin/bidet. As long as you
have a continuous fall of as much as practical there will be no problems,


The maximum fall should be no more than 90mm / meter (and no less than
18mm). This is to prevent the siphoning problem that you observed, and
also to stop the water flowing away too fast and in the process
depositing any solid matter that was flowing with it.



That's useful info, is it the same for all wastes (loo, basin, etc) and
pipe sizes (50mm and 100mm)?

--
Dave S
(The return email address is a dummy)

Dave wrote:
John Rumm wrote:

mrcheerful . wrote:

glug when you emptied the bath or the basin/bidet. As long as you
have a continuous fall of as much as practical there will be no
problems,



The maximum fall should be no more than 90mm / meter (and no less than
18mm). This is to prevent the siphoning problem that you observed, and
also to stop the water flowing away too fast and in the process
depositing any solid matter that was flowing with it.



That's useful info, is it the same for all wastes (loo, basin, etc) and
pipe sizes (50mm and 100mm)?

oops sorry, 'just saw your other reply. Thanks!

--
Dave S
(The return email address is a dummy)

Dave wrote:

That's useful info, is it the same for all wastes (loo, basin, etc) and
pipe sizes (50mm and 100mm)?

Have a look at building regs approved document H, that has loads of info
on all sorts of sewage and water drainage etc.

http://www.odpm.gov.uk/stellent/grou...pdf_600283.pdf



--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

John Rumm wrote:
Dave wrote:

That's useful info, is it the same for all wastes (loo, basin, etc)
and pipe sizes (50mm and 100mm)?


Have a look at building regs approved document H, that has loads of info
on all sorts of sewage and water drainage etc.

http://www.odpm.gov.uk/stellent/grou...pdf_600283.pdf




Thanks again, I keep forgetting about that site and it's really useful.

--
Dave S
(The return email address is a dummy)

John Rumm wrote in message ...
To run the waste through the studs, in my opinion is a bad idea.
Firstly 34mm out of a 75mm or even 100mm timber is a bit much. You
then have the pain of geting them in the correct line and angle of the
cut and how are you going to feed the pipe through if you use a hole
cutter and if you notching through a successive amount of studs
doesn't sound like a good idea. You would be better off going down to
the floor, through the sole plate of your stud partition and under the
floor.
A shower trap can be cleaned from above, but I have fitted a shower
tray on 4"x2" timbers givving me 4" of clearance to make accesibility
to the shower tray easier in the event of a bad blockage.( its also a
bit easier to work with when connecting ).