Best underlay for wooden floors

[Republik]

I'm looking to lay a solid wood floor on top of a concrete floor.

Which underlay is the best for the job? I ideally want one which will add some thermal efficiency to the floor and remove any slight undulations in the concrete.

[beanbag]

[TWSTEEL]

Jablite or similar but will add about 2" to the floor thickness.

HTH


http://www.vencel.co.uk/products/insulation/

ETA

Edited by TWSTEEL on Monday 26th January 10:02

[shirt]

imo, the thick green fibreboard stuff. i layed onto concrete and the stuff on the roll was a load of crap. one room i did has the fibreboard, and another has 4mm foam which was fine for removing small high-spots etc. but isn't as good for sound reduction.