Currently the floor is a concrete slab so I'm wondering about using ply or OSB to create a floating floor over 50mm insulation boards, but I've no idea how well the foam would cope with the weight of machines, drill press, lathe, etcetera sat on it. Another option is to forget the insulation and sit the board on the concrete (there's already a DPM), or to use rubber mat (roll or interlocking). What have others done?
There are 2 roller shutter doors so I plan to build an insulated stud wall inside one of them but want to retain access to t'other so am thinking of a pair of some kind of insulated plugs that, when not wanted, will slide into the void created between the other door and the stud. Any ideas?