In May 2013, we finally cleaned out the attic and had a contractor install 12" of blown-in insulation.
The old wood floor (if you can call it that) was torn up and the undergrads removed it from the attic and disposed of it. It was quite a pile of debris! The ceiling joists were extended up to support the new floor and the insulation went in flush with the top. We then installed 13 sheet of plywood for the new floor that will provide storage and roof access.