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However, if you are finishing the attic into a liveable space, then the insulation should go between the ceiling joists in the attic, not in the attic floor. Attic floors are insulated only if the attics are not liveable spaces. Otherwise, the attic room will turn into an oven in the summer and an icebox in the winter. If you just want to finish it into storage by slapping a few sheets of plywood on the joists, I would build up a slab the size you need (a few sheets of plywood wide and long) that gives you the recomended thickness.