Cutting into Soil Stack

[ln1234]

We have a plastic grey Soil Stack which needs to be 'cut into' to add a T for another bathroom that is being created. Is the only solution removing the whole stack (3 stories up) and rebuilding it again, or are there special fitments available for this purpose?

Rough Diagram:

 

[bripl]

two ways of doing it both involve cutting a section out
one/ use 2 slip couplings and a branch
two/use one rubber coupling and a branch
the first option looks the neatest but they both do the job

 

[ln1234]

Which method is the least disruptive to the existing stack? Cutting the stack is fine, but will it have to be lifted to put the new couplings in?
My fear is we'll have to dismantle the whole stack from the new tee upwards..

 

[bripl]

no need to disrupt anything cut the pipe where you want the branch insert the tee plus pipe and slide up the slip couplings job done 20 mins max

 

[ln1234]

Something like this? (Plus a bit of pipe of course)

Thanks for your help

 

[ln1234]

apologies for sounding a bit thick, but could you give me an example of a slip coupling? (website etc). Thanks!

 

[JohnD]

I'm only an ignorant amateur, but I used a slip coupling, very handy job.

Imagine you have two ends of soil pipe you want to join. They're a short distance apart. Now imagine you have a slightly larger diameter pipe, in a short section, like a sleeve. You have this over one of the ends of pipe (you put it there before assembling your branch) and you slide it up to cover the join.

That's basically how it works. Has that given you a mental image?

Usually couplings have a ridge inside that butts up against the pipe as you push it in, so make sure you've pushed them the right distance. The slip coupling doesn't have this ridge.

 

[ln1234]

I think I get the idea now. The slip coupling can be slid all the way onto one end of the pipe, so that when the pipe is put back in place, the coupling can slide up and cover the small gap. Do you know where I can get a slip coupling from?

 

[JohnD]

I got mine from a builders merchant, you'd quite likely find one at your local DIY shed.

As there is no stop on the coupling, you should put a mark on the pipes before sliding the coupling into place to show where it should stop.