glue floor gypsum, which glue?

[byggarebo2]

I'm going to glue floor gypsum onto a wooden joist structure with grooved chipboard (underfloor heating) but what adhesive should I use and where can I buy it? It doesn't matter if it's cheap. I have K-rauta, Byggmax, and Beijer nearby. Laminate will then be laid on the floor gypsum.

 

[viktorj]

I usually glue with an adhesive from ardex called s48. It might not be cheap but it's really good.

 

[byggarebo2]

Damn, that's expensive :-]
Is there anything else you can use? Regular tile adhesive? Or is there too much water or something when it comes into contact with the particle board?

 

[GoForIt]

Casco Boardfix. Available at, for example, K-rauta.
Not cheap either..

 

[byggarebo2]

Do I need to glue at all in my case? I'm going to lay floating laminate on gypsum. Maybe I can screw it anyway? I also have a bathroom where gypsum will be laid and then levelling compound. Is it ok to screw everything?

 

[nino]

There is a risk that the screws will gnaw through the drywall, it is not at all as rigid with screwed as with glued.

 

[Bernieberg]

Where you are going to lay kaminat, it might be an option to lay 12 mm chipboard instead, and screw it. In bathrooms, it might be a good idea to apply leveling compound directly on the underfloor heating if it is included as an installation option with your underfloor heating system. That way, you might avoid the gluing.

 

[Claes Sörmland]

The adhesive Gyproc G46 is sold for this purpose. When I look at the construction product declaration, the binder is vinyl acetate/ethylene copolymer, which is a variant of what is sold as wood glue. Furthermore, it's the same chemistry used in primers applied before tiling.

Ardex S48, on the other hand, is cement-based.

 

[sune73]

Or skip the plaster where you are supposed to have the laminate.
Lay the laminate floor directly on the sheets.
That's what I did except in the bathroom.