Rather than screws, use something like this:
(Found by googling for "insulation fixings")
If you need a lot of them, google instead for dämmstoffdübel or dämms toffhalter, and buy them from Germany/Austria. They are a lot cheaper (eve n with shipping) from there.
Thanks but - that'd be good to fix the insulation without cold bridging. But doesn't solve the issue of fixing the plasterboard to the wall.
Going to be hard work if he is already committed to discreet sheets of PB and double foiled PIR/
Board fix foam perhaps...
There are a variety of those hammer in fixings. As long as you don't mind skimming the plasterboard once up then they can retain the PB as well... they normally have a head designed to take plaster or render.
I would expect something like a 4mm diameter Reisser cutter screw in appropriate length:
Into a 6mm hole with a red wall plug should do it. The head shape will hold PB reasonably well.
(I just measured the head diameter on a 4.0x50mm Reisser, and it was
7.7mm - so a 60 will be similar or very slightly larger)So drill a hole right through the lot and into the wall. Put the plug on the end of the screw a few turns then tap it through the hole until you have an inch of screw left sticking out and then drive it home.
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