900 or 1200 plasterboard

[Richard A]

I'm not an expert on this, just wanted to inform that it was not allowed and that there was information available.
I placed kottlingar to have something "solid" to mount things behind the tiles, 45-200 should handle most of it.

 

[Richard A]

The strange thing about it is when the retailer says it's okay to have plyfa behind the new boards. Feels very misleading in that case.

If you mean the guy at the building store, then during my bathroom construction I haven't found anyone who knows anything about this, unfortunately.

 

[SnickareEk]

If you mean the guy at the hardware store, then during my bathroom construction, I haven't found anyone who knows anything about this, unfortunately.

Well, I mean the tile specialist in Stockholm, whom I got to talk to their most knowledgeable guy about luxboards, but apparently, he was wrong then. But wouldn't it be a bit thin to place, for example, 1 luxboard or masterboard or similar 1 layer? In that case, you would need to install 2 layers, and then the cost of building a bathroom would be about 7-9 times more expensive for the groundwork than today, if not more, alternatively if you use a 20mm luxboard?

 

[v-g]

If you use CC30 studs, you can use single gypsum board from Gyproc. Costs only about 3 times more than regular gypsum

 

[peter.holm]

So the recommendation is to space studs tightly, e.g. cc300, nail them until you bleed and then add a layer of approved surface board?

 

[v-g]

At CC30 you don't need to reinforce except where mixers/cabinets/sinks are supposed to be as far as I know. Check here to see the different possibilities.

The Gyproc is fiberglass-reinforced in the middle so it should hold, one would think.