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 soil 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?

 

A show, a basin and a washing machine into that manifold should be far enough away from the toilet pan. Probability of all three being used at the same time i would think is small(ish) so I would use one

Edited July 19 by BotusBuild

[Susie]

@BotusBuild

so just checking I understand a swept T at existing then 110mm across to basin area then the shower, basin and plant room in 50mm to the 110mm

 

But not the other way around all in 50mm coming together at the existing 110mm 

 

can you explain why?

Thanks

 

 

 

[Nickfromwales]

@Susie

 

You need one of these as low on the 110mm pipe as is possible. 
 

 

And then use the solvent inserts to 50mm pvc pipe, not the rubber bungs that are on the ‘elephants foot’ you posted an image of.

 

Then take a pair of 50mm pipes, one to shower one to where sink waste is, reducing at each item; you’ll want a 50mm bend facing up out of the floor, and then when above ground you reduce to 40mm, then the 90° bend before the basin trap would be a 40mm bend with a 40/32 reducer in to outlet, then a short piece of 32mm between the bend and the sink trap. 
 

Depending on what shower trap you have, you can either go straight on to their supplied adaptor, or reduce to 40mm immediate before the trap.

 

No need for air admittance or ‘Durgo’ valves etc as the inverted are all <1300mm. 👍. 

Edited July 19 by Nickfromwales
Solvent, not spent....stupid fat thumbs and an iPhone that makes shit up as it goes along....

[Nickfromwales]

One of the boss outlets is open, the other 2 are ‘blind’ so you need to drill the second one out   

[Temp]

+1 just check you can get a branch for the WC above it without it being too high.

 

 

[Susie]

@Nickfromwales

is that boss going at existing pipe?

Perhaps should have said pipe is female coming out of slab with male just resting there for now. 
in  which case is this what I get. 

I have the Impey linear 4 just arrived today and toilet and sink arriving Monday. Just so I can play around to get things dry fit, probably take me a month just to do the insulation in all rooms so plenty of time. Then box out all areas pipe will be and fit after the screed. 
thanks

just noticed the <1300mm comment the shower waste to existing pipe is more like 2000mm. 

[BotusBuild]

Susie, Nick is right (as always) and I was on my way back to suggest same thing as that is what I ended up using as well. The push fit boss in your last post will do the same thing as what nick suggested.

[G and J]

1 hour ago, Susie said:

just noticed the <1300mm comment the shower waste to existing pipe is more like 2000mm

So if a waste run is more than 1,300mm an AAV is required?

[Nickfromwales]

26 minutes ago, G and J said:

So if a waste run is more than 1,300mm an AAV is required?

The invert, not length. 
 

An AAV is there to alleviate the vacuum caused by flushed water etc dropping vertically (more than 1300mm), cancelling out the air being sucked in behind it.

 

The invert is the lowest point of the outlet of the WC pan, to the lowest point of the pipe it meets, when returning to a horizontal run. 

[Nickfromwales]

2 hours ago, Susie said:

@Nickfromwales

is that boss going at existing pipe?

Perhaps should have said pipe is female coming out of slab with male just resting there for now. 
in  which case is this what I get. 

I have the Impey linear 4 just arrived today and toilet and sink arriving Monday. Just so I can play around to get things dry fit, probably take me a month just to do the insulation in all rooms so plenty of time. Then box out all areas pipe will be and fit after the screed. 
thanks

just noticed the <1300mm comment the shower waste to existing pipe is more like 2000mm. 

Yes, that fitting will do as long as stated the pan connector will go into it and be low enough to get onto the pan.

 

Or, you just put that piece of pipe back in, cut it to leave 60mm of stub, and then glue on the one I posted. 

 

re 1300mm, see me last   

[Spinny]

Apols Susie, just couldn't see your makeup from the photo. Not seen studwork going down into the insulation layer before.

[Nickfromwales]

3 hours ago, Spinny said:

Apols Susie, just couldn't see your makeup from the photo. Not seen studwork going down into the insulation layer before.

Defo not the norm, and usually on a kicker course of engineering bricks and Marmox breakers.

 

I noted the low noggins, to catch the tail end of the plasterboards I assume(d), so thought they had this in check somehow.....we gotta pick our battles