Atlas EnergyShield CGF Pro (formerly Rboard Pro) is composed of a Class A fire rated closed cell polyisocyanurate (polyiso) foam core faced with a high performance coated glass facer on the front and back. EnergyShield CGF Pro combines high R-value, Class A durable glass facers, and water resistive barrier attributes in a high performance rigid insulation board. Panel sizes are 4' by 8' or 4' by 9'. Panels can be supplied in nominal 16" or 24" widths for use in cavity wall applications.