The Ametalin Floor Insulation ThermalFloor 30m is an extra heavy duty double-sided reflective foam underfloor insulation that is used under floors with a sealed airspace between the flooring and the enclosed sub-floor space. It is made with rigid high-density XPE foam that resists flapping with open sub-floor. It contributes a reflective R-value when installed adjacent to an air cavity and reduces draughts through strip flooring. With specifically placed weep holes throughout the ThermalFloor for water drainage, it helps reduce the risk of condensation.