IKOTherm^® III - 25 PSI polyisocyanurate foam insulation is constructed of a non-organic coating bonded to a fiberglass strand mat, offering superior dimensional stability and resistance to moisture. As a rigid polyisocyanurate foam insulation, IKOTherm III - 25 PSI has a high thermal R-value that provides outstanding insulation protection, which helps to reduce heating and cooling costs. Lightweight and easy to handle, IKOTherm III - 25 PSI is available in multiple board sizes and a range of thicknesses to meet a variety of insulation needs.