I have a 100 yr old farm house that the attic is semi-floored, I had new insullation put in the attic and when they blew in the cellulose they created a box over the ceiling joists to a height of about 5-8 inches. I want to continue the flooring of the attic and am wondering what will be my best course of action. Compressing the cellulose to place 2x4's over the joists or what?