I have a walk up attic. Very very poorly insulated with the pink blow in stuff .I currently have some OSB panels up there laid across the joists as a place to store stuff. I want to increase the insulation up there and not lose my storage. I plan to pull up the osb, add a framework of 2x6 lumber that runs across the joists at a 90 degree angle. Put in celulose insulation and then put down 1/2 or 3/4 inch plywood. I wopuld then build some Shelves above that so that I could walk down the middle of the attic and have organized storage of all our crap . Currently it's just a bunch of haphazard stuff up there. I am wondering about the increased weight of the framework and if that is something I should be concerned about. House was built in 1987. I am thinking that metal storage shelf systems might shave some weigtht from up there. I am open to any ideas of how to accomplish the insulation increase and minimize the weight load I put on house. Thanks.