Connecting a new toilet into an existing soil stack

[Alan Greenhalgh]

Hi. I want to connect a new toilet waste into an existing 110mm soil pipe. The soil pipe runs from the second floor bathroom, down through the room where I need a new toilet and then down through the ground floor where there is another toilet attached. The soil pipe will not move up or down so is there a way to cut into the pipe and add a suitable branch for the new toilet? Thanks.

 

[Ben-gee]

Cut the pipe where you want to put the branch, then cut it again say 1m above - remove this 1m section.
Fit your branch and reduce the 1m length by the appropriate amount. Lube up the pipe, fit a slip coupling to the existing stack (approx 1m above branch) , insert the “1m”section into the top of the branch - line it up and then pull the slip coupling back down so it is half/half on each pipe.

All cuts need to be nicely chamfered and burr free.

Mark the pipe so you know where half/half is.

Fit a pipe clip directly below the slip coupling to stop it moving (or run gaffer tape around if you can’t get a clip on it)