Late last winter I got to thinking about this subject. I have 2 attics because it's a tri-level, so 2 doors to lose heat from. Neither were insulated, so I bought some 1 or 1.5" pink insulation board and cut several layers to fit the back sides of the door. I used long screws with fender washers to keep them in place, but some kind of construction adhesive would be good too. The foam fit tight enough into the doorways that it should have sealed most air leaks too. Weather stripping the edges would be a good upgrade later.
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