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Mar
13
comment How can I improve the insulation in the lower attic space?
Sorry, my previous comment got cut short. When I say rated as such, what I mean is that it has the same fire rating as any other insulation, and is rated for crawl space use. You'd also want to use the right fasteners, like this: lowes.com/pd_285633-67865-TMF2.5PA_0__?productId=3199781 Those will secure the board without ripping right through. You can then seal the seams with foil tape. The nice thing about the foam board is that it is easy to cut. In my attic, they used foil backed board. Here's a photo: !i.imgur.com/LBMsoA1.jpg
Mar
13
comment How can I improve the insulation in the lower attic space?
The foam board is an insulation board, and is rated as such. An example is this from Home Depot: www.homedepot.com/p/t/100320335?catalogId=10053
Feb
22
comment How can I improve the insulation in the lower attic space?
That's right: in the lower attic, the vapor barrier of the bats goes against the roof, insulation facing in. Then the foam board is nailed to the rafters, sealing the insulation in. As I understand it, the insulation you have is currently installed backwards, you'd generally put the vapor barrier against the outside.