How to attach plaster from the wrong side?

[Perham]

Need to access a ventilation shaft to possibly insulate the pipes about 2m and can only do it by sawing through an interior wall with drywall on both sides of the studs.

The first board will not be a problem to reattach, but how do you do it easiest if I have to put back the inner drywall board?

Anyone have a simple solution?
It will be difficult to hold the inner board too when trying to place it in the hole.

Grateful for suggestions!

 

[Småbrukaren]

It's a bit tricky to understand what you mean, but I assume you mean that you don't have anything to screw the plasterboard back into when you've cut it out?

Is the inner plasterboard visible anywhere?

 

[Matti_75]

Gypsum board adhesive and drywall screws. There are specific ones made for screwing gypsum into gypsum

 

[Perham]

It's a bit tricky to understand what you mean, but I assume you mean that you have nothing to screw the drywall back into once you've cut it out?

Is the inner drywall visible anywhere?

Hi, exactly. I have an interior wall with drywall-stud-drywall. I can only access one side to screw when I'm restoring.

 

[JockeUn]

Place studs/planks across the back and attach the drywall to them later (the black lines); you should be able to secure them when it's open.

 

[JockeUn]

Here is a video