Relocating soil pipe

[Fredxx]

I currently have a soil pipe which is in the middle of the house. I'd like
to re-route it.

Does a soil stack have to have a pure vertical pipe, can it have a dog leg?
Can I cut out a piece and put in a lateral "U" so it can be boxed in a
corner instead? Obviously it means the system can't be rodded if it gets
blocked.

Example - using a fixed width font.

Existing Proposed
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I can get a fall on the horizontal sections, but not quite the requisite 4".
Will that present further problems?

Are there any issues in using an air admittance valve inside the house, or
attic.

[d...@gglz.com]

Building regs permit single offsets, but they're discouraged. Don't
know about the pattern you propose, but if you do it, include all the
readily-accessible rodding points you can, as well as ensuring all the
pipes/joints are very secure and you might need to think about thermal
movement too.

I have a single offset at the bottom of the stack to couple a new,
conventional, internal to the building, open stack to pre-existing
underground drainage (which was centred under a window). It's a chapel
conversion so has a new upper floor, and this avoids the difficulty of
ripping up ground floors and digging new underground drainage

My offset is 1.5m, and the Building Inspector asked me to make best
efforts to have a wide radius bend at the bottom of the stack
(actually a rest bend) and include rodding points.

Give plenty of thought to how it can all go wrong, where material
would back up, overflow/spill-over points and how you'd clean up the
whole disgusting mess if it happens.

[Steve Walker]

Fredxx wrote:

> Existing Proposed
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> | _____________________
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> | _____________________|
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>
> I can get a fall on the horizontal sections, but not quite the requisite
> 4". Will that present further problems?

I think it's a very dodgy approach - you have unreachable block points, and
a lot of joints which might leak.

But perhaps if you made the horizontal sections with clear pipework, and
integrated it into the coving? That might be an interesting conversation
piece - younger family members could play pooh sticks (with real poo), and a
rudimentary morse code of dots & dashes could be used to ask for another
roll of andrex.

[Grimly Curmudgeon]

We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "Steve Walker" <spam...@beeb.net>
saying something like:

>But perhaps if you made the horizontal sections with clear pipework, and
>integrated it into the coving? That might be an interesting conversation
>piece - younger family members could play pooh sticks (with real poo), and a
>rudimentary morse code of dots & dashes could be used to ask for another
>roll of andrex.

Didn't the French do that at the Poopidoo Centre?

[Lobster]

Fredxx wrote:
> I currently have a soil pipe which is in the middle of the house. I'd like
> to re-route it.
>
> Does a soil stack have to have a pure vertical pipe, can it have a dog leg?
> Can I cut out a piece and put in a lateral "U" so it can be boxed in a
> corner instead? Obviously it means the system can't be rodded if it gets
> blocked.

I did a conversion about 6 years ago of one house into two, which ended
up with what appears to be totally bizarre soil pipe configuration. The
idea for the only possible route for them was dreamed up by an architect
and ultimately approved by Building Control, and works something like this:

Toilet upstairs at the front of house "A". Soil pipe goes to left 0.5m
then drops down through the ceiling into the kitchen. Runs along the
entire length of the kitchen ceiling to the back of the house. Goes
sideways through the party wall into house "B", where it mates with the
vertical soil stack of house "B" which is inside a walk-in cupboard in
the living room of house "B", immediately below the bathroom.

It disappears into the solid living room floor, and then runs under it,
and the solid kitchen floor, and out into the back yard where it meets
the inspection chamber.

So that's 5 90-deg bends I think?(!). The whole lot is boxed in within
double-layered plasterboard and rockwool which provides very effective
sound insulation; and every dog-leg except the underground one has a
rodding eye should unblocking ever be needed. The position of these is
defined by a skimmed-over hatch on the plasterboard, so minimal surgery
would be needed if ever there was a blockage.

Both properties have been rented out for ~6 years with no plumbing problems!

> Are there any issues in using an air admittance valve inside the house, or
> attic.

In principle, no - both the above properties have one within a boxed in
area behind the toilet. There are various regs though as to whether
your property is suitable for them though - check the archives of this
group for "AAV", "Durgo" etc.

David

[djc]

Lobster wrote:

> I did a conversion about 6 years ago of one house into two, which ended
> up with what appears to be totally bizarre soil pipe configuration. The
> idea for the only possible route for them was dreamed up by an architect
> and ultimately approved by Building Control, and works something like this:
>
> Toilet upstairs at the front of house "A". Soil pipe goes to left 0.5m
> then drops down through the ceiling into the kitchen. Runs along the
> entire length of the kitchen ceiling to the back of the house. Goes
> sideways through the party wall into house "B", where it mates with the
> vertical soil stack of house "B" which is inside a walk-in cupboard in
> the living room of house "B", immediately below the bathroom.

[...]

> Both properties have been rented out for ~6 years with no plumbing
> problems!

So long as they are rented and have the same landlord I suppose that is
tolerable. But I would hate to be the owner of A xor B when something
nasty happened.

--
David Clark, MSc, PhD. UCL Centre for Publishing
Gower Str London WCIE 6BT
What sort of web animal are you?
<https://www.bbc.co.uk/labuk/experiments/webbehaviour>

[Lobster]

djc wrote:
> Lobster wrote:
>
>> I did a conversion about 6 years ago of one house into two, which ended
>> up with what appears to be totally bizarre soil pipe configuration. The
>> idea for the only possible route for them was dreamed up by an architect
>> and ultimately approved by Building Control, and works something like this:
>>
>> Toilet upstairs at the front of house "A". Soil pipe goes to left 0.5m
>> then drops down through the ceiling into the kitchen. Runs along the
>> entire length of the kitchen ceiling to the back of the house. Goes
>> sideways through the party wall into house "B", where it mates with the
>> vertical soil stack of house "B" which is inside a walk-in cupboard in
>> the living room of house "B", immediately below the bathroom.
> [...]
>
>> Both properties have been rented out for ~6 years with no plumbing
>> problems!
>
> So long as they are rented and have the same landlord I suppose that is
> tolerable. But I would hate to be the owner of A xor B when something
> nasty happened.

So would I! ;-)

But to be honest, most of the rodding points at least are not within the
building of house B, so it would be *extremely* unlikely that you'd ever
have to open a rodding point within B to cure a blockage caused by the
residents of A, which would I suppose be the very worst case scenario.

David

[Fredxx]

"Fredxx" <fre...@spam.com> wrote in message
news:hmdjbi$fon$1...@news.eternal-september.org...

I'd like to thank all the contributors to this thread for the helpful
information they've given.

It seems that it's not realistic for me to do the route I'd like to because
of lack of rodding facilities, unless the removal of a bath to gain access
is acceptable!

I also found http://www.planningportal.gov.uk/uploads/br/BR_PDF_ADH_2002.pdf

Thanks again.