My workshop is being erected in a couple of days.
It's to be insulated throughout. The floor will be plywood over a pressure treated frame.
I was thinking of covering this first ply floor with 50mm Kingspan or Celotex then 12mm ply for the finished floor. To save some funds could I substitute the Kingspan / Celotex for 50mm expanded polystyrene? would this produce more 'bounce' in the floor when working and would it be strong enough for long term use?
Opinions please.
Martyn