Replacing attic insulation
I have a 1930s brick house in the Washington, DC suburbs with a large attic -- you can stand upright in it. It is accessible from a permanent stairway with a door at the bottom, at the bedroom level. There is one louvered vent to the outside, approximately 18" square. The attic floor is framed in 2x8s and filled (or mostly filled) with some sort of cotton-type loose insulation. It seems to be in fair condition, but I would need to pull up a lot of floorboards to get a complete assessment, which I'd rather not do. The roof is very steep and the insulation (TWO layers!) that had been stapled to the rafters years ago was sagging, falling down and disintegrating, so we ripped it all out.
The question now is: what, if anything, do we put back up there? (The attic is used for storage only.)