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I can't tell for sure based on the picture, but it looks to me like you have the roof deck on the left, and a knee wall on the right that separates an already finished portion of the attic from the area pictured, like this: and you are considering utilizing one of the areas labeled Attic 1 as the closet. If that is correct, you may already have a slight ...


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You cannot achieve R38 in only 5 1/2 inches. One of the highest rated insulations is spray foam, and it is around R6 per inch, which would require 6 3/8 inches at least. If you did fur out the rafters with 2x2s (1.5 x 1.5) then you would have 7 inches total to use and could install 1/2 inch baffles and have closed cell spray foam installed. It would be ...


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You can use something like a Larsen truss (non-structural) to make more space for insulation. Basically attach thin plywood to the existing rafter / truss members and attach a 2x2 to hold the face of the insulation / drywall at the appropriate spacing below the roof sheathing.


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