Alububble 2906 - Single Sided AluminiumThermal Insullation Size (1.25m x 40m) . Thermal provides 100% cover and has a natural ability to “tighten” a building reducing noise, draughts and air movement. Cellulose is able to fill all small, hard-to-reach cavities and irregular surfaces making it over 20% more effective than roll or board type insulations once installed. Even under test conditions (completely flat surfaces) .