Steel / aluminium soil stack

[IMH]

I'm refurbishing a bathroom and need to move the toilet from being up against an outside wall to an inside wall. The new location is next to the soil stack which runs from the ground floor to the top floor. It's a 3 storey house and the bathroom is on the middle floor. The stack runs inside the house and is boxed in all the way up.

I was going to cut into the stack, fit a new branch and then make good using a length of new 110mm plastic pipe and a slip coupling.


I came to start the job today and found that the current stack seems to be aluminium or steel with a white covering. Does anyone know why this metal pipe would have been used rather than plastic? And if it might cause problems if I replace a short section with plastic pipe? The house was built in 2000 so probably not an age thing.


Also, the slip coupling I have says it's for underground use. Is there any difference between that and a normal slip coupling for 110mm soil pipe? Looks to be the same apart from being a terracotta colour.




Thanks

 

[Chalked]

Are you sure it's not just white soil pipe?

 

[ShaunCorbs]

could you post a pic up and have you started cutting in?

depending on age of house it could be a few things

 

[plumben]

The slip coupling will not stand up to the uv light, you'll have to get another one,
If the house was built in 2000 it will be most likely plastic