Henry High-Density Polyiso Cover Board is a ½"-thick, high density polyiso insulation panel specifically designed for use as a cover board. Suitable for both re-roofing and new construction applications, this product is manufactured online using premium-performance coated glass facers (CGF). High-Density Polyiso Cover Board delivers an R-value of 2.5, which is significantly higher than roof cover boards made with other materials such as wood fiber or gypsum.