Fixing insulated plasterboard to solid wall

[hairgoneJohn]

Hi

I wish to fix some insulated plasterboard to a solid end wall. It is presently smooth and plastered. I want to tape and joint and so need the plasterboard to be flat.
Do I just use adhesive or are there fixings that will sink below the surface please?

 

[noseall]

Do I just use adhesive or are there fixings that will sink below the surface please?

Both. Adhesive first. Allow to go off. Then mechanically fix

 

[martygturner]

6 fixing per full sheet, i would recommend https://www.amazon.co.uk/STAIFIX-INSOFAST-GALVANISED-PLASTERBOARD-FIXING/dp/B016DMKJZO other suppliers are available. Drill a pilot hole smack in with a hammer.

 

[hairgoneJohn]

Thanks. Should I worry about thermal bridging as the fixings are metal?

 

[martygturner]

they are only small and then only go into the inner leaf of a cavity and if its a solid wall then what 6 small points are possible cold brigdes, compared to the gain from the insulated PB thats going to be a minimum loss.

 

[hairgoneJohn]

Thanks. When should one use foil backed insulation and when not please?