Reducing soil pipe diameter

[janz70]

Hi, is there anything available to reduce a section of soil pipe from the toilet to the stack (4" down to say 3") as looks like a real problem fitting in 1200mm shower tray and boxing in soil pipe in a bathroom 1325mm wide.

or does anybody have any idea how I would build a stable stud wall to encase the soil pipe and shower water supplies

 

[seco services]

you can't reduce the toilet waste to 3"

 

[kevindgas]

as seco says you can't do it. but if you did the likely outcome would be an overflowing toilet bowl!!!

 

[dextrous]

Unless you go for the dreaded macerator!

 

[swbjackson]

Which you can't do if it's the only toilet.

 

[janz70]

Thanks guys, dont want a floor covered in poo.

Ive found I can work round it (just) with a little rerouting and strange studwork construction (verticle studs on wall then horizontal on top of them)

 

[cowboyplumber]

you can't reduce the toilet waste to 3"

If you can't, do you want to tell me why there are thousands of 3" stacks in Halifax, W/Yorks?

Not that I approve

 

[kevindgas]

you can't reduce the toilet waste to 3"

If you can't, do you want to tell me why there are thousands of 3" stacks in Halifax, W/Yorks?

Not that I approve

from OPs description it appears he wants to reduce to 3" from 4" along the way which is not a good idea
some older WC were 3" outlet and that would not be reducing but using 3" all the way

 

[doitall]

Perhaps the Cowboy is only seeing the 3" vent pipe as he gallops past.

Perfectly acceptable.