I just bought a house that has a workshop below the garage. The foundation is a slab, the shop has cinderblock walls, and the ceiling is reinforced concrete (it's the floor of the garage). I want to insulate it and cover the walls in aspenite or drywall, but I'm not sure the best way to go about it. The previous owner had started nailing furring strips to the walls with styrofoam sheets between them, but that seems to me inadequate. I'd much rather have 2x4 studs all around, but am uncertain as to how or whether to attach them to the walls.
What I'm thinking of is simply fastening the sill plates to the ceiling and floor and then attaching the studs to the sill plates without attaching them to the walls. Would this work?
The next problem is how to deal with the ceiling. The room is huge (the size of a 3-car garage), and spanning it with joists seems excessive. On the other hand, hanging a drop ceiling from concrete is likely to be a lot of work, and in any event I'd like to be able to hang lighting and a vacuum system up there.
It's a pretty unusual setup. Any suggestions?