IKOTherm® CoverShield Polyiso HD Cover Board is a rigid, polyisocyanurate foam insulation with high thermal properties designed for use as a cover board. The product is constructed from a closed cell polyisocyanurate foam core bonded on each side to coated glass fiber facers during manufacturing. IKOTherm CoverShield has a much higher compressive strength than conventional polyiso roof insulations, is dimensionally stable and can be sized with ease.