On Jun 10, 7:49 pm, "js.b1" wrote:
How much give is there in PIR foam when pushed between battens? That
is to say, if I use 47x38mm treated battens do I use 40mm or 45mm PIR
foam?

The solid double brick wall is "distinctly variable" re bellied wall,
bricks tilted, however obviously the battens will sit on top of the
wall.

I assume 40mm, just wondered what people have found from experience.

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.

Cheers
Jim K