New soil stack

[stevie123456789]

Hi a few questions if possible. I'm looking to install a new soil stack for an ensuite bathroom. The sewer runs just below where I want the stack so can you just tap into that? Once the stack is installed I gather it has to go out above the roof. Is it possible to direct it around the rainwater drains on the outside or does it actually have to go through the Soffit and roof? Does anyone know the sort of cost this would all be?

thanks for your help

 

[noseall]

Provided the existing drain is not to deep then you will be able to tap onto the run.

Your best bet is to dig a big hole once you have found the pipe. You can then 'graft in' an access chamber - either a small shallow access or a standard 450mm one.

The grafting in process will involve using an angle grinder and a pair of slip couplers or a pair of jubilee clip Fernco style fellas, depending upon whether it is plastic or clay.

Once the chamber is in place, you can then run your stack from one of the inlets and up the wall. This will need to terminate 900mm above any openable window within (i think) 2m.

If there are no windows OR if you have a stack venting the head of the drain elsewhere on the property, you can fit an external spec' AAV, so no need to divert around any soffit.

Regards the soffit; it is up to you whether you divert around the soffit with a pair of 45° bends or go through it. Going through will be more work and will involve a lead slate as well as a bit of tile cutting, but will look much neater. If the soffit is asbestos, i would be reluctant.

This is also controlled work.

 

[noseall]

Costing will depend upon what is underground, i.e. depth of drains, how 'busy' it is regarding interference from other underground services, access etc.

If everything went perfectly, you could get the chamber in and say the stack fixed up the wall, at least to the branch where you will need to connect the loo and the basin/shower etc all in a day.

A second day may see you fit the remainder of the stack and drill the W.C and other wastes and get them to their terminals.

All in all, say £250 for the bits and £700 in labour if all went perfectly.

However, jobs like these could easily double in price if any of the first paragraph stuff bites you in the butt.

 

[stevie123456789]

Thanks for the replies. I'm keen to keep the price down but wouldn't risk taking on the job myself. Is there anyway to know the exact location of the sewage pipe without specialist kit or is out a dig down and see job? Also how deep is it likely to be, would you use a spade or do I need something more heavy duty?
Cheers

 

[freddiemercurystwin]

First step is to have a look for any manholes upwards or downwards of where you want the connection and lift them up, otherwise some cautious excavation would be pretty effective and if any quoting builders can see the pipe and its proximity to the house wall etc that would (should) significantly reduce any assumptions your builders will need to consider in their quotes.

 

[hammerswinger]

...Costing will depend upon what is underground, i.e. depth of drains, how 'busy' it is regarding interference from other underground services, However, jobs like these could easily double in price if any of the first paragraph stuff bites you in the butt.

Too true,
I've just finished the drains for my extension and the old clay pipes had been encased in about 6" of concrete, this obviously slowed the job down a lot as I had to carefully remove the concrete without damaging the pipe so I could install a new inspection chamber to the existing pipe, it would have been quicker to renew the whole length of clay pipe which I would have done if it didn't run under the garage floor!

View media item 45782
View media item 45783

 

[stuart45]

You did really well to get that lot off without cracking the pipe hammerswinger.

 

[hammerswinger]

Thanks, but I can tell you it was a slow process. I used a breaker to remove the bulk of it then changed to a sds hammer drill and chipped away at it at a shallow angle, as the clay pipes are glazed the concrete came away from most of the pipe quite cleanly, but there's always the odd bit here and there that refuses to come off without a fight.

Hope stevie gets lucky and finds nice clean pipes.


Cheers.