H-Shield HD Composite CG is an innovative solution composed of two products, H-Shield HD - a 1⁄2" high-density polyiso cover board – and H-Shield CG - a premium performance faced polyiso. This product is ideal for commercial roofing projects that require high thermal efficiency combined with maximum durability in both new construction and retrofit applications. R-value is optimized with a thinner profile than other insulations available on the market.