I recently bought a home built in 1910. At some point, 5"-6" of fiberglass insulation was blown into the attic, then covered with 1/2 OSB (1,100 SF). I am looking to bring up the R-Value of this attic but struggling with my options. My wife wants to retain the ability to use it as storage.
I thought about building up additional storage with 2x10 or 2x12's, blown in insulation and additional plywood over the framing. However, I have concerns about the weight and stress on the trusses. I also thought about pulling up the existing OSB to reduce the weight before building it up higher. However the OSB is screwed to the joists and I am afraid it was done to ensure that the roof trusses don't pull away from each other.
Would it be beneficial to roll out R-30 batts over 80% of the attic and leave no additional insulation wherever we end up using storage (not optimum, but easy and safe structurally. Could roll back up if we need additional storage)? What solutions would you consider instead?