Quick question, I've just built a small shed in our yard on a concrete slab. My question is do I need to insulate the floor. I'm doing the walls/roof with 25mm polystyrene, DPM then chipboard(got it dirt cheap). The shed is waterproof all round. Its only 8' x 8' but I need to save cash where I can. For the floor I was going to build a frame and use polystyrene there too but I don't want to lose anymore height so I'm thinking of putting down carpet tiles with maybe some of that thin under laminate floor stuff straight onto the slab :)

How does it sound? I know it's not going to be super insulated but as long as I can comfortably work in there with a small heater I'll be happy.

Cheers, Phil