I know this has been debated in the past but I am damned if I can remember the final verdict (if there ever was one!)
I have a 10 foot by 8 foot tongue and groove shed which I am siting on a concrete slab.
I intend to insulate it with either Crown Wool or Dry Therm - I can easily build up the sheds battening to accomodate a decent thickness of either. My inclination at the moment is to go with 75mm dry therm cut to fit. The inner skin would be 4mm hardboard nailed over the insulation
Question is ......... do I need a moisture barrier? I suspect I do, and should it go between the insulation and the outer skin of the shed or between the insulation and the inner skin. I would think it should be the former.
I was intending to use standard clear plastic dpm - which I will probably have left over from casting the concrete slab.
Not sure how to go about insulating the floor yet! It will be 12mm sterling board or ply on 4x2 'joists' which sit on the concrete.Its just possible that I could lay rows of bricks on top of the slab and sit the joists onto the bricks - to keep the damp out of the joists. I had thought about nailing a board - Something like a couple of strips of feather edge to close the open ends between the joists. Close enough to the ground to keep the mice out but would still allow some limited movement of air. I hope to give the underside of the shed a coat of bitumastic to help keep the damp out.
I have plans on how to deal with the windows (double glazing which I just happen to have and thick curtains) and the door (an insualted lobby with an outer door built onto the side of the shed, both doors draftproofed).
I know it sounds a bit belt and braces but I need to be able to store 'electrical stuff' in there that would be totally knackered in an ordinary shed. I have a (limited) power supply laid on and will have a tubular heater on a stat to stop the place freezing in winter. The cold isn't such a desperate problem as the combination of damp and cold.
It will also have the added bonus of being warm enough to sleep in when the wife locks me out :o)
All wisdom (on the insulation, not the wife) gratefully received!