Which adhesive and which screws for drywall on lightweight concrete (siporex)?

[Zekovski]

Hi!

I am planning to install approximately 215 sqm of drywall on light concrete (Siporex).

Can one screw directly into light concrete with, for example, a drywall screw without it cracking?

Which adhesive is the most convenient, cheapest, and works well together with screws?

I have received a recommendation from Hornbach to use Casco Husfix Rapid, but I find it quite expensive (575kr for a 10kg bag). And I need to use screws with plugs. It sounds a bit like overkill, but as I said, I've never done it before!

Best regards,

Aleks

 

[Peter2400]

It should work just as well with fästmassa, somewhat cheaper
https://www.hornbach.se/p/fix-megaline-megafix-fastmassa-20kg/7766240/

 

[Anonymiserad 405730]

Hello!

I am going to install about 215sqm of plasterboard on lightweight concrete (siporex).

Can I screw directly onto the lightweight concrete with, for example, a plasterboard screw without it cracking?

Which adhesive is the most convenient, cheapest, and does the job along with the screw?

I currently received a recommendation from Hornbach to use Casco Husfix Rapid, but I find it quite expensive (575kr 10kg bag). And that I need to screw with a plug. Seems a bit overkill to me, but as I said, I've never done it before!

Best regards,

Aleks

One usually glues with gypsum mortar, available at all building supply stores..

https://www.bauhaus.se/gipsbruk-norgips-25-kg

 

[Zekovski]

People usually glue with gypsum plaster, it's available at all building supply stores..

[link]

Yes, exactly, I find it strange that Hornbach doesn't sell Norgips gypsum plaster when they sell their drywall 😅

 

[Anonymiserad 405730]

Yeah, exactly, I find it strange that Hornbach doesn't sell Norgips plaster when they sell their plasterboards 😅

Don't they have Finja's range, so their plaster should work too...

 

[Zekovski]

I can't make sense of their search engine. I don't get any concrete results when I search for the "right" words...

 

[Fjonken]

Double glue with regular fix or plaster mortar

 

[Anonymiserad 405730]

Can't make sense of their search engine. I can't find anything concrete when I search for the "right" words..

They call it Gipsputs..

Not sure if it's as good or if it behaves like plaster though?

 

[Fjonken]

I can't make sense of their search engine. I can't find anything concrete when I search for the "right" words..

search for gypsum

 

[Zekovski]

They call it plaster.

I don't know if it's equally good though, or if it behaves like plaster?

I saw it and find myself as puzzled as you 🤔

 

[Zekovski]

search for gypsum

Do you want to try describing what you mean one more time? 😅

 

[Anonymiserad 405730]

Gypsum plaster and gypsum are very sticky and adhere to most things, but the question is how Finja's gypsum plaster is...

 

[Zekovski]

Do you want to try describing what you mean one more time? 😅

search for gypsum

It's me being slow, just saw it!

 

[Zekovski]

It should work just as well with adhesive, it's a bit cheaper
[link]

I will probably go with this one. Do you have any hot tips about screws for this and if it's okay with drywall screws directly into siporex?

 

[MathiasS]

I did this 20 years ago. I think I talked to Weber then. Support said at the time, although they didn't want to say it officially and guarantee the result, that the best and cheapest option (then) was to use a "putsbruk". It says somewhere on this forum what I used, but I don't remember myself. I spread it out with a large notched trowel (10mm maybe?) and then pressed the sheet into place. It's still sticking to the wall.

Edit. The official answer was Serpo 616, that product still exists. But, as I said, I used some "putsbruk" which in practice ended up being the same thing, but much cheaper.