Isover Calibel board is made up of a thick base of glass mineral wool insulation which assures excellent thermal, acoustic and mechanical insulation, it is finished with a 12.5mm plasterboard lining. Thermal Conductivity 0.035 W/mK for the insulation Excellent acoustic performance Excellent fire safety Vapour permeable breathable insulation Improves energy performance and reduces heating & cooling costs Made from recycled glass Easy to install, see manufacturers guidelines on installation