WC Frames back-to-back - possible?

[Rick734]

Hello guys,

 

New here so TIA for any help received. Hoping @Nickfromwales can comment on this one, from what I've seen of previous threads as a lurker.

 

So in my house refurb project I have decent size bedroom that I've turned into a bathroom and ensuite. Not massive but big enough. Not sure if the bathroom shower is going to be a bit too much but we'll see. The issue I have is that the sensible layout for both rooms will have the two wall-hung WC frames back-to-back behind each other - slightly offset, but the majority of the frames will be literally back-to-back. I've partially built the wall in 145x45 timber to provide some solidity for the frames and some extra depth - I figured I could get away with a couple of slimline frames plus boarding off one side of the wall in 25mm OSB/ply underneath the tile backer board to give me 20-25mm extra depth.

 

However just trying to figure out if I will be able to fix the frames securely enough, given that one of the top main bolts won't be able to be fixed, as it will be behind the other frame. Obviously I can stick the frame in place, fix sideways and upwards through timbers, etc - will that be enough? I could potentially drill some holes through the top of the frame and bolt them together to share the load (hopefully they're both in use at the same time to balance it out 😆)Hope that makes sense...

 

The wastes are a different story...we'll come onto that shortly...

[Onoff]

Why not just do the wall in 200mm deep studs. You could have some nice feature pockets or an inset medicine cabinet. 

[Rick734]

Thanks Onoff - I've already built quite a bit of the wall... so don't want to redo unless I really have to. Originally used 145 as I didn't want to add too much weight or bulk to the whole wall, as I've only just got enough depth in each of the rooms anyway (and I didn't give the plumbing enough thought :)). Figured that if I just boarded off to get the extra depth it might give me more flexibility later (e.g. I could sink the end of the bath into the wall by just trimming the board around it....)

 

But also still need to sort the problem of not having a brace or stud behind one end of the WC frames...

[Rick734]

And this is my plan for the waste, unless anyone has a better idea... The wall has to be positioned where it is due to the minimum sizes wanted in each room, so I figure this is the only way I can get both wastes into the main soil pipe. Obviously the two wastes from the WCs are offset, so one is behind the other in the image shown. Not ideal using a flexi but I don't think anything else is going to work for that type of bend - down, turn under the opposite WC frame and then down again into the main soil. Is that workable?

 

[Russell griffiths]

I would not be putting any form of flexi waste in a place I can’t get to. 

[Mike]

4 hours ago, Rick734 said:

I don't think anything else is going to work for that type of bend - down, turn under the opposite WC frame and then down again into the main soil.

Geberit make connectors for back-to-back WCs - https://catalog.geberit-global.com/en-NT/systems/CH3_102113/products. I guess others probably do too.

[Rick734]

6 hours ago, Russell griffiths said:

I would not be putting any form of flexi waste in a place I can’t get to. 

Have you had bad experiences with them? I've talked to one or two pretty experienced plumbers/bathroom fitters who are happy to use them for technical jobs where there's no other solution...

[Rick734]

1 hour ago, Mike said:

Geberit make connectors for back-to-back WCs - https://catalog.geberit-global.com/en-NT/systems/CH3_102113/products. I guess others probably do too.

thanks Mike - not sure there's anything short enough for what I need though...

[Kelvin]

The Geberit installation instructions allow for screwing into the frame for extra support. The top bolts are relatively substantial so you’d need to really secure it. I CT1d both of ours but that’s not really structural it’s more to stop the wallboard from moving and cracking the tiles. 

[Onoff]

6x2 stud here. Coach screws in from the side

 

 

 

You could even consider doubling up on the studs either side:

 

 

On the wall a length of unistrut. Studs off that to the Geberit frame. 

 

 

You can just see where I used studding connectors to extend the original Geberit studs.

 

 

I'd be thinking on the lines of insetting a chunky bit of steel angle into each face of the stud to bolt to. Pass the fixings studs through that it replaced with longer studs/ hex extenders etc.

 

I also marine ply faced the lot:

 

 

 

Then Aqua Panel:

 

 

Sikaflex first:

 

 

Self drill screws into the Geberit frame:

 

 

More Sikaflex:

 

 

Aqua Panel:

 

 

[Russell griffiths]

9 hours ago, Rick734 said:

Have you had bad experiences with them? I've talked to one or two pretty experienced plumbers/bathroom fitters who are happy to use them for technical jobs where there's no other solution...

I would only ever use one directly from the wc, so visable, I’ve seen a few pics of them being attacked by rodents, the theory was they let light through them so a rodent in the pipe thinks it’s an escape route and chews through it. 
have seen two pictures of this recently on a plumbers talk group. 
 

if you are remodelling both bathrooms there must be the chance to chase the soil pipe back to run it in where you need it. ?.