The Ametalin Wrap SilverSark XHD is an extra R-value insulation single-sided foil. It is an extra heavy duty, single-sided reflective foil insulation and radiant barrier with a Class 2 Vapour Barrier. There is an anti-glare coating on one side of the insulation for easy installation and is puncture resistant. SilverSark XHD is ideal for steel or timber framed, tile, and metal roofs in residential, commercial, and office buildings.