Insulating Hardwood on Concrete Stairs

[Zardoz]

I'm relatively new to laying flooring and have no experience with laying onto concrete.

I understand that wood flooring needs an insulating layer when installed onto concrete to stop the water from adversely effecting the flooring. My problem is however how can I adequately fit an insulating layer whilst also insuring the flooring is well fixed to the stairs?

Any help would be appreciated.