Rmax Thermasheath®-3 is an energy-efficient thermal insulation board composed of a closed-cell polyisocyanurate (polyiso) foam core bonded to reinforced aluminum foil facers with clear coating for limited protection against oxidation on each side. This lightweight thermal insulation board has reinforced aluminum foil facers. Thermasheath®-3 is suitable for use in cavity walls, masonry walls, vaulted ceilings and some limited roofing applications, as well as many other building envelope continuous insulation applications.