ᐅ Wall Construction in Bathrooms

Hello everyone, I have two questions about wall construction in the bathroom.

1. Do I always need a backing wall behind the toilet, sink, and shower? If so, how should it be built—drywall or masonry (brick)?

2. In the second bathroom, the layout is arranged like a "T," where two sinks are installed, each adjacent to a toilet and a shower. Again, should these backing walls be made of drywall or masonry?

I hope you can provide some tips with the advantages and disadvantages of each option.

Thank you very much.

We needed an extension because the toilet is located on the exterior wall, and no pipes are allowed there due to frost protection.

If you choose a T-connection for the sink, please use masonry. For drywall construction, you need to install a support plate.

Okay, thanks for the reply. In our case, it’s a load-bearing interior wall where the toilet is supposed to be installed... is that possible, or only with a stud wall in front?

What would be the disadvantage of a mounting plate? It should work without any problems, right?

Does no one have any opinions on this yet? I would appreciate your input. Regards

Nowadays, walls are often fitted with a secondary wall structure, known as a pre-wall installation.
However, the installations can also be routed within the wall itself.
It doesn’t matter whether it’s masonry or drywall construction. I’m not sure about timber frame.

The toilet requires a cistern, which is integrated into the pre-wall structure.