Cold patches

[camerart]

Hi,
I have some cold patches plasterboard stuck to a solid wall.

I thought of drilling holes where it is dry, and filling with foam. I find that this is how plasterboard can be stuck!

Then I'll clean out the cold bit, where the adhesive is, and fill with insulating material.

My question is: Can a mix be made using Vermiculite, perhaps with plasterboard adhesive?

I realise, I can cut plasterboard and fill the holes with that, but it's just an idea.
Camerart

 

[dontbelieveawordofit]

back filling with foam may push the board off the wall.

 

[camerart]

back filling with foam may push the board off the wall.

Hi B,
I'll use care, thanks.
C