Installing double drywall in the bathroom - how do I do it?

[-JC-]

I will attach double drywall (standard gypsum board) on wooden studs with 45cc in the bathroom. I will screw and join the first layer against each respective stud. But how do I proceed with the second layer of drywall? The boards should be staggered and overlap the joints in the first layer of drywall. Does this mean that the second layer is only screwed into the first layer of drywall without a stud behind? Is that correct?

I will also glue the second layer of drywall. Is it recommended to also glue the first layer of drywall to the studs?

 

[slacker]

But wait now - Which drywall panels are 45 cm wide?
The panels you should use are at least 90 cm, which is perfect for framing at 45 cc, right?

 

[-JC-]

You're so right slacker! Today's brainfart The cast is naturally 90 and nothing else.

 

[Stefan N]

If you use cc45, then all the joints will be on a stud.
But I would have used plyfa in the first layer instead.

 

[mickekarl]

I assume you are using 900 mm wide gypsum. Once you have set up the first layer on the studs, you cut the next sheet to start with along the length so it comes on a stud that you did not join on the first layer. This way, the joints are staggered.

 

[norrbottenstorpet]

As Stefan N says, why double drywall in a bathroom? If it's stability you're after, plywood is much better. And the only other purpose I can think of is fire protection, but that seems a bit far-fetched in a bathroom. So why?

 

[stoif]

That wasn't what the question was about, but surely the rules have changed so that it's not okay with cardboard gypsum under the waterproofing?

 

[Stefan N]

Depends on what you want to have on the wall, tiles or carpet.

 

[verktygsgurun]

Depends on what you want on the wall, tiles or carpet.

And in which zone....

 

[Dallelkpg]

How is it with plasterboard now really...
I have just built a bathroom and the company I hired said that a year ago it was okay to use plasterboard again behind the waterproofing layer, some membrane and rubber, etc.
I trusted him as he is a good friend of the family and is also the owner of the company, quite large and well-known company too.

Even the bricklayer who came later and did the work said it was completely okay now according to new regulations with the "membrane" and rubber they are using.

I would have used double plasterboard for soundproofing but instead used OSB and then plasterboard, and then waterproofing and tiles of course. Also used cc300.

So? What's the deal really, there seem to be different opinions?

Checked some pictures and saw that this is the material they use.
http://www.mira-byggeprodukter.se/Default.aspx?ID=291
http://www.mira-byggeprodukter.se/Default.aspx?ID=172

The membrane was overlapped and then the seams were sealed with rubber and then the entire wall was sealed with rubber after that.

http://www.mira-byggeprodukter.se/Default.aspx?ID=272
It states in the installation instructions in this link that it can be used in both zone 1 and zone 2 on
Board materials and other moisture-sensitive substrates such as plaster/gypsum block

?

/Mattias

 

[-JC-]

I follow GVK's rules with waterproof vinyl flooring when renovating the bathroom. It's okay to use gypsum board then.