On 21 Aug, 23:16, "js.b1" wrote:
There are various insulation "knock in" plastic fixings whereby you
knock a peg into a tube.

Are they strong enough to go thro 9.5mm PB & 40mm Celotex?

Obviously the PB would require a 5-6mm skim, just wondered if it would
work re avoiding wood battens on solid brick walls and all the mucking
about that involves.

dot and dab the PIR PBoards, add a couple of frame fixers at head
height (for fire safety), skim with usual 2mm - voila!

worked for me & am still here with no probs 4.5yrs later ;)

Jim K