2 layers of drywall how to handle the first layer

[preben89]

Hello.

I am going to put 2 layers of plasterboard on a chipboard wall for the purpose of soundproofing.

1) Are there plasterboards without tapered edges on the sides or whatever it's called for the first layer? Or do you really have to plaster the first layer to make it even?

2) For the second layer - can I place the boards directly against each other?

3) Is it better soundproofing if I glue the second layer instead of screwing with plasterboard screws for double plasterboard? Recommended glue for this? Or should I use shorter lengths of plasterboard screws so they only attach to the first plasterboard and don't go through into the chipboard and the studs?

Thanks!!

 

[Fel av Åke]

Yes, there are boards without chamfering. When you screw up the boards, make sure not to place the joints of both layers in the same spot. Offset the top board to reduce the risk of cracks, increase stability, and reduce the risk of sound transmission. I would also screw in the top board with a sufficiently long screw to attach to the particle board. This is to ensure good strength. I don't think it matters for sound damping purposes.

 

[useless]

You can place the first layer horizontally and the second one vertically so there won't be a long joint coinciding with the screw line in the outer layer.

 

[nino]

I applied latex in all the joints on the first layer, wall ceiling between sheets.

 

[preben89]

Yes, there are boards without chamfering. When you screw up the boards, remember not to place the joints of both layers in the same place. Offset the top board to reduce the risk of cracks, increase stability, and reduce the risk of sound penetration. I would also screw the top board with a sufficiently long screw to attach it to the particleboard. This is to achieve good strength. I don't think it matters for soundproofing purposes.

thanks for the answer

 

[Martin Lj]

You absolutely need a screw long enough to reach the particle board on the topmost drywall. You cannot attach drywall to just drywall. Personally, I would choose a screw length that reaches the stud for both layers of drywall so that they hold well.
Install with staggered joints as already mentioned.

 

[preben89]

Okay, thanks for the response, I couldn't find any plasterboards without chamfers for the first layer, so I guess I'll have to fill them before the top layer goes on.

 

[Matti_75]

Okay thanks for the answer, I couldn't find drywall without beveled edges for the first layer so I guess I'll have to putty them before the top layer comes on

You absolutely do not need to putty the first layer. Just offset the seams by placing the seams on different studs

 

[preben89]

You absolutely don't need to spackle the first layer. Just offset the seams by placing the seams on different studs

I understand.. Yes, but then there will be an empty space under the top layer of plasterboard (where the first layer's seam is), doesn't feel so stable, right? But well, maybe it's fine if you don't screw right there

 

[Matti_75]

Understand.. Yes, but then there will be an empty space under the top layer of plasterboard (where the joint of the first layer is), doesn't feel so stable, right? But it might be fine if you don’t screw right there

There's no problem, you won't succeed in pulling the plasterboard in the indentation. The screw goes through the board before the plasterboard bends.
Thousands of m2 of plasterboard are mounted like this every day and it follows the suppliers' installation instructions.

 

[preben89]

Ok, thanks for the response.