THERMAX Wall System has a 4.0 mil foil facer that provides builders with more durability for long-term performance. With a 4.0 mil embossed exterior foil facer, this solution provides builders with more durability for long-term performance. The CI is also the only insulation with a dark exterior facer optimized to go behind rainscreen exteriors. It is engineered with fiberglass reinforced core for enhanced fire performance and a stronger, straighter board. When used as part of the THERMAX Wall System, the thermosetcoated aluminum facer provides a drainage plane, WRB and exterior sheathing. As a UV stable material, the product can remain uncovered up to six months. With its low perm rating and high insulating value, the system reduces the potential for condensation within the wall assembly resulting in long lasting performance.