Fixing interior insulation/pb how

You can get screw insulation fixings - spread the load across the soft insulation, and thermally broken to avoid bridging. eg

For the PB, have you thought of using PIR-backed PB? Saves having to bond them. You probably still want thermally broken fixings, but could skim over them.

Theo

Most new builds today have plaster board bonded to block work using dot and dab method to fix to the wall. I believe the same method is used when dry walling with insulation backed PB.

Richard

I looked at insulated pb, it's way more money. Not sure why. Screwing it in place without any timber, would that cause edge cracks?.

Which glue is recommended? Pva or acrylic?

I fixed 50mm PIR to my inside front walls using 30mm battens cut down from CLS 95mm x 38 timber. THe width of the circular saw blade gives

The battens were fitted horizontally with a frame around the window reveal where I hacked off the plaster from sides and top (there was galvanised mesh spot welded to the lintel for the plaster to key onto so I just jemmied this off and lined the window reveal with homemade foil-backed PB held in place with foaming PU adhesive used liberally to create a full foamy barrier between wall inner leaf and metal lintel and the PB.