On Jun 10, 8:27*pm, Jim K wrote:
by PIR do you mean Kingspan etc? if so, not much give
(I'm assuming you're thinking of bashing it onto sticky out bricks etc
and hoping it will mould/give to them? can be a PITA apart from an odd
one).
I'd have a measure and buy specific quants of each to suit the
"terrain" they'll have to cope with.

Not so much bashing, just wishful thinking (45mm PIR against 47mm
battens :-)
I will go with 40mm PIR. If anything sticks out further I will use
25mm PIR and Marmox 6mm 10mm offcuts.