The invention is directed to a floor underlayment material comprising a film sheet having an inner surface attached to a foam sheet and an outer surface including a plurality of recesses formed therein. The plurality of recesses define one or more fluid pathways through which a fluid may migrate across the outer surface of the film layer. The underlayment material may be used in a flooring system to help prevent or limit the accumulation of a fluid between the floor and the subfloor. In one embodiment, the underlayment material may be disposed between a subfloor and floor with the outer surface of the film layer being disposed adjacent to the underside of the floor. The one or more fluid pathways provide channels through which a fluid such as moisture vapor may escape from within a flooring system and thereby reduce the accumulation of moisture in the flooring system.