Cork Underlayment On Concrete . Test any concrete slab subfloor in direct contact with the ground, either above or below grade, for excessive moisture vapor transmission prior to the installation of the mantoncork underlayment. Make sure you follow all manufacturer’s instructions when installing underlayment over tile on an existing subfloor made of cement or concrete (this also applies to install cork board). All About Underlayments from www.hoskinghardwood.com Best underlayment for laminate flooring on concrete 1. Failure to do so (especially over concrete!) can result in compromised results and reduced material lifespans. Heritage mill cork flooring can be used in the basement although the warranty doesn’t cover flood damages.