AIRVENT BD Top GRAFITE is a panel for the construction of Ventilated roof systems consisting of high-density wood fibre insulation material sandwiched between two self-extinguishing graphite-based polystyrene panels with an incorporated 40 mm ventilation chamber, pre-coupled to the support for the roof covering consisting of an OSB/3 wood panel. It is a high performance package both thermally and acoustically within the parameters set by law. Airvent BD Top GRAFITE is a panel designed to achieve the parameters related to thermal lag.