Folks, what TOG rate underlay do I need put between concrete subfloor and 8mm laminate flooring (no underfloor heating)? I was thinking of Tech boards with 2.15 TOG. Is this OK? Would it work? Another option is 1.4 TOG polystyrene foam with foil backing. Would it suffice? TOG is lower, but moisture barrier is built in, although the subfloor concrete is dr enough. Sorry, I complete newby in these things.