Gyproc Thermaline Plus wallboard is combined of gypsum plasterboard which has been bonded to an extruded polystyrene foam insulation layer. The foam offers an integral vapour control layer in Gyproc Thermaline Plus for medium to high levels of thermal insulation in walls, ceilings and reveals. Gyproc Thermaline Plus can be used for drylining internal surfaces but it isnt compatible in areas that are damp or humid. Faced in ivory gypsum plasterboard and backed with orange extruded polystyrene, this product can be decorated over as soon as the joint treatment has dried. Gyproc Thermaline Plus can be plastered over with British Gypsum Thistle MultiFinish to achieve a smooth, crack-resistant surface ready for final decoration once primed. The time gap between completion of lining, plastering and then decorating should be as minimal as possible. This wallboard is certified to BES 6001 and tested to requirements laid out in EN 13950:2014. Gyproc Thermaline Plus Wallboard Specifications Length: 2400mmWidth: 1200mmThickness: 40mm Fire Rating: Class 1Thermal Conductivity: 0.19W/mK