Thank you in advance for your help and expertise. I’m cleaning out and re-insulating a formerly rat-infested attic. I’ve air sealed most penetrations, seams, and top-plates. Now I’m making a storage platform – just 8×10. Due to the former rat problem, I’d like to use polyiso panels between joists with plywood running perpendicular and seal all gaps (if the rats ever get back in, my thinking is to minimize the “dens” I create for them).
Here are my questions:
Can I use panels with foil on both side and layer them up to the height of the joist?
Can I use expanding foam to seal the edges and seams of the polyiso?
Can I use polyiso to make ‘boxes’ to go over some recessed lights that are not IC rated?
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