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 | | | | | | | | | _____________________ | | | | | | | | | | | | | _____________________| | | | | | | | | | | | |

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.

[dom]

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]

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" saying something like:

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

[Lobster]

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!

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]

[...]

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.

[Lobster]

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]

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

again.