Bathroom connections into soil pipe

[Susie]

I’m planning in advance of the floor insulation and screed how I’m going to connect my shower waste and sink waste into the soil pipe.

The shower is marked out bottom right of image and will connect diagonally across room to the soil waste pipe.  The wall hung basin marked out with its waste either going across room also or through stud wall into the plant room where a washing machine will be and it can join the waste from the washing machine following perimeter of walls back into bathroom and to soil waste pipe.

My options are then 2 or 3 connections into the waste pipe.

I found this whilst searching for waste couplers anybody any thoughts on this or alternatives.

 

[Oz07]

Why is you waste pipe miles away from where it's needed?

 

I'm not sure you can have 2 appliances into a single 40ish mm pipe? Building regs doc is pretty helpful. Check that out.

[Susie]

The waste pipe is where the toilet will be. 
I was going to use 50mm pipe for the connections. 
 

[Oz07]

Oh well you can't bring another up now but one near opposite corner or in stud / plant room behind would of been helpful. I think you are limited to how close connections can be on the horizontal level. Ie a branch connection has to be so far below a toilet waste. Check out the build regs doc it has these dimensions in

[Spinny]

30 minutes ago, Susie said:

I’m planning in advance

So presumably this is a ground floor with a concrete slab ?

If that back black wall is an outside wall I'd have thought consider digging up a piece of slab next to it to run a drain out through that wall. Maybe do this in the plant room/laundry room and then run the basin and shower waste through the stud wall and across to reach a new

drain next to the black wall. You could dig out a channel in the slab and/or raise the shower tray to cover the shower waste pipe.

 

It is a hard thing, there is so much detail, but the more that is planned in advance of a build the better, especially M&E.

[Susie]

I have 180mm insulation to go down and 55mm of screed minimum so I have worked out the 1:40 slope will get to the drain in the insulation layer but not sure about the coupler that I need. 

[BotusBuild]

Susie,

What about inserting a swept T in the existing soil pipe and then extending the soil pipe through the 180mm insulation following the red line in the edited photo. Then run your basin and shower waste following the approximated blue lines?

 

Your waste pipes from the plant room could also come through the stud wall into this soil pipe of course. Then you can go down to 32 or 40mm waste pipe for each "appliance"

 

[BotusBuild]

That soul pipe suggestion i made is daft @Susie.

Start with the swept T but just do a straight line to somwhere close to  the basin and the shower with no other bends. Doh, what was I on last night?