Hello!

I'm renovating a basement bathroom. I'm considering whether to smooth out the walls with plaster or to frame them out with metal studs and install humidboard, before applying the waterproofing layer. What are your opinions?

The wall to the right in the picture will have a framed wall due to the installation of pipes.

The plan is to apply waterproofing throughout the bathroom since the floor will be insulated and no longer directly against the ground (admittedly a little bit directly against the footing under the interior walls to the right and left in the picture).

The floor will be newly cast with insulation underneath and with underfloor heating. The room is on a side of the house that is above ground level. The wall to the right and left are interior walls made of lightweight concrete resting on a concrete footing (in the picture you can see that the footing is deficient, but it will be cast so that concrete runs down under the current "footing," so it becomes solid) that stands directly on the ground. The ground level on the other side of the exterior wall straight ahead is about 5 cm below the finished bathroom floor (the floor will be where the old bathroom mat ends approximately).

Thanks in advance!
 
  • Basement bathroom under renovation with light concrete walls, a textured wall on the left, exposed pipes on the floor, and a wooden ceiling.
Rebecca124
Now I'm not a professional, but I just had a company out to work on a bathroom in our old vault where there are plastered walls. They said they would frame out with metal studs to create an air gap in between, which was best so the plaster can breathe, he said.
 
Do we have any more comments?

A wall made of lättbetong on the ground, but above ground level, is it better to frame and put up boards, or to plaster it smooth before applying a waterproof layer?
IF framing out is the approach, how is ventilation in the air gap addressed?
 
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