I will be moving various bits of soil piping around and have drawn a
blank on fall rates. From a look, old cast iron pipes look to have a
generally steeper fall than modern (smooth) plastic piping [which
makes sense]. Also, soil piping seems to come with either 2.5 degree
or 22.5 degree branch adaptors. What are the regs / practice? Is it
2.5 degrees for plastic and 22.5 for iron?

Thanks,

Mark

I will be moving various bits of soil piping around and have drawn a
blank on fall rates. From a look, old cast iron pipes look to have a
generally steeper fall than modern (smooth) plastic piping [which
makes sense].

I looked this up the other day and found reference to it being from 1:40
to 1:80

LJ

in2minds wrote:

I looked this up the other day and found reference to it being from
1:40 to 1:80

The figures 18 - 90mm fall per metre run come to mind - going down to 9mm if
you have more than 1 bog connected?, which going back to the original
question means that 22.5 deg is too steep

Jon

Mark Begbie wrote:

I will be moving various bits of soil piping around and have drawn a
blank on fall rates. From a look, old cast iron pipes look to have a
generally steeper fall than modern (smooth) plastic piping [which
makes sense]. Also, soil piping seems to come with either 2.5 degree
or 22.5 degree branch adaptors. What are the regs / practice? Is it
2.5 degrees for plastic and 22.5 for iron?

IIRC building regs say the fall should be between 18 and 90mm per meter.

Have a look at approved document H:

http://www.odpm.gov.uk/stellent/grou...eg_600283.hcsp



--
Cheers,

John.

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In an earlier contribution to this discussion,
John Rumm wrote:


IIRC building regs say the fall should be between 18 and 90mm per
meter.



That's between 1 and 5 degrees in real money!
--
Cheers,
Set Square
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Please reply to newsgroup. Reply address is invalid.

On Tue, 2 Nov 2004 14:00:39 -0000, "in2minds" wrote:

I will be moving various bits of soil piping around and have drawn a
blank on fall rates. From a look, old cast iron pipes look to have a
generally steeper fall than modern (smooth) plastic piping [which
makes sense].

I looked this up the other day and found reference to it being from 1:40
to 1:80

LJ


Thats is, if its too steep the water runs away, and the solids have no
water to travel with.

1 in 0 (vertical) is also allowed.

Rick

in2minds wrote:

I will be moving various bits of soil piping around and have drawn a
blank on fall rates. From a look, old cast iron pipes look to have a
generally steeper fall than modern (smooth) plastic piping [which
makes sense].


I looked this up the other day and found reference to it being from 1:40
to 1:80


I had 1:60 to 1:110 s being in te range for outside work.

I'd say that 1:60 lies within all our estimates,so should be adopted.

LJ

Set Square wrote:

In an earlier contribution to this discussion,
John Rumm wrote:


IIRC building regs say the fall should be between 18 and 90mm per
meter.




That's between 1 and 5 degrees in real money!

or 1:11 to 1:50 in ratios