The Trojan Heatmate Perforated Underlay - 2mm is ideal for underfloor heating systems. The perforated holes facilitate the transmission of heat and with heatmate underlay, you are sure to reach top efficiency of your flooring heating system and it also ensures sound reduction of your flooring. The underlay is easy to lay and has a 20db sound reduction and a tog value of 0.35. This underlay is 2mm thick and comes in rolls 1 meter wide and covers an area of 12.5m².