Attic insulation question
I’m doing a gut renovation of a 1000 sq ft finished attic in NJ.
I plan to spray 5″ of closed cell foam between 6″ rafters and 3″ of foam on the attic exterior walls and put 3′ x 3′ doors on the side attics for access
Question: In addition to the insulation above, my Architect suggests insulating the knee walls of the side attics because he says the side attics are not heated space, but I don’t think this is a good idea because: 1) the insulation would be redundant 2) it might confuse the installers to where the thermal boundary is: at the kneewalls or at the rafters 3) there might be condensation on the cold surfaces of the unheated side attic .
What makes sense here? should I insulate the knee walls? Also, would you sheet rock the ceiling and behind the knee walls, inside the side attics (used for storage)?
Any input is appreciated. Thanks.
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