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. One side of the product is dark gray for use in open joint rainscreen applications. EnergyShield® CGF Pro combines high R-value, durable glass facers, and water resistive barrier attributes in a high performance rigid insulation board.