Gypsum on gypsum without screws and plastic under interior wall sill

[Byggtankar123]

I need tips as I am planning to recess drywall between the wall studs on the back of the existing surface drywall. I have no possibility to screw, so I have to use some other technique. I've considered adhesive but was advised against it as it often forms a "skin" on the glue very quickly, and then it adheres poorly. So my other thought is to use tile adhesive, as it bonds very well between tile and drywall, so maybe it could work between drywall and drywall too?
Do you have any ideas?
Possibly, I might use Fermacell instead of regular drywall since it's heavier. But that shouldn't affect the choice of solution, right?

Then I will build up another interior wall parallel to the existing one but with a slight air gap between them, a so-called double-wall construction. Between the (heated) concrete slab and the interior wall plate is a 300mm wide plastic film. Can I place the next plate on the same plastic film, or must the space between them be free of plastic film?

Thanks!

 

[Stefan N]

Tile adhesive works excellently for gluing plasterboard; mix it fairly loosely.

 

[Byggtankar123]

Stefan, does it matter if it's Fermacell versus gypsum with fix?

 

[Byggtankar123]

Went and bought plasterboards and tile adhesive from Weber, so it should turn out well.

 

[Byggtankar123]

Also need an answer to this question:

Then I will build an additional interior wall parallel to the existing one but with a small air gap between them, known as a double wall construction. Between the (heated) concrete slab and the interior wall base lies a 300mm wide plastic film. Can I place the next base on the same plastic film, or must the space between them be free from plastic film?

 

[Björn Melander]

Is it for increased soundproofing that the construction is built?

 

[Byggtankar123]

Is the construction being built for increased soundproofing?

Exactly

 

[Björn Melander]

Then it's best to glue. You don't want an air gap between the sheet materials. Not much glue is needed between the sheets as they will also sit securely in the soft joint around them.

 

[Byggtankar123]

I have been advised against glue before for this reason, but also because PL400 easily forms a skin which means it doesn't adhere at all.
I then think that if you comb the fix and then rub the loose board against the fixed one, you should be able to minimize the air gaps. Alternatively, you could roll out the fix.
What do you think?

 

[Björn Melander]

A few strands of mjukfog are enough. The board will also sit in mjukfog all around. If you want braces as well, you can secure with blocks against the studs.

 

[Byggtankar123]

Do you mean that you apply some latex sealant randomly and press the panel into place? I've thought about mounting a triangular strip or something similar so that the panel is also screwed in.

 

[Björn Melander]

Certainly, you can use e.g. Tec 7 or another soft sealant. Not much is needed as the board is also sealed around the edges. Screw support blocks into the wall studs.

 

[Byggtankar123]

Okay, have already bought some tubes of LD708
http://www.illbruck.com/sv_SE/produkter/soek-produkter/product/ld708-latexfog-acrymeric/

But maybe it will work too, otherwise I can use LD708 for sealing around and not as glue.
Isn't it you who also writes as Wellness music on the studio forum? Can continue there to keep it in one place.

 

[Björn Melander]

LD 708 works just fine.

Yes, I usually write under the studiobygge section on that forum

 

[Byggtankar123]

Are you aware of my other consideration regarding plastic under the new interior wall?