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
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.
I used some rough plastering , and also mortar paint on the walls before fitting kingspan so as to block off any draughts through tiny holes.
I'm wondering about a thin layer to go over the kingspan and the battens to totally seal it, not sure what to use though.
[g]
Since this wall is solid I do not have to repoint it. However for waterproofing I will be using EverBuild D.P.M. which is basically a bitumen & latex paint.
Foil backed or moisture resistant plasterboard will seal it re damp. As for air draughts you only need block convection, the insulation will do that.
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