I'm trying to figure out a way to insulate my workshop floor. Unfortunately before I had chance to place anything down prior to the workshop being erected has left me with a 3 inch gap between the floorboards and the concrete the workshop sits on.
I thought about putting some 50mm polystyrene sheets down and then making a false floor on top of this, but after consideration it doesnt seem practical.
My final thought is that i could block off both ends of the workshop, at the base, and drill some holes into the floorboards, then squirt expanding foam into the floor cavity.
Below the 6 inch concrete base is a layer of plastic sheeting, so its damp proofed.
I was thinking of using Gorilla Filler
http://www.ebay.co.uk/itm/GORILLA-FI...#ht_978wt_1163
I would appreciate any thoughts on this. Has anyone used this expanding foam? does it act as insulation?, does 750ml cover a large area?