BucksDad Workshop Build - Groundworks

[Jameshow]

I won't be having joists though because of height restrictions, so it was going to be concrete floor + vinyl flooring. Now I think I will do concrete floor, DPM, egger protect 22m chipboard so I want the levelling compound so it's nice and flat for the chipboard

Why not put an inch of polystyrene in there it won't take away much headroom but it will warm up the space no end. Nothing worse than cold feet.