Atlas EnergyShield CGF is a high-performance continuous insulation board composed of a closed-cell polyisocyanurate foam core with patented coated glass-mat facers on both sides. It is manufactured using environmentally responsible processes and formulations, containing no CFCs, HCFCs or HFCs, resulting in Zero Ozone Depletion Potential (ODP) and Negligible Global Warming Potential (GWP). EnergyShield is GREENGUARD Gold certified and contributes to LEED credits. Boards are available in sizes 4' x 8' or 4' x 9' and thickness from 0.5" - 4".