The Celotex XR4165 General Purpose PIR Insulation Board is a high-performance solution designed for use in floors, walls, and roofs across a wide variety of building projects. Measuring 2400 x 1200 x 165mm, this rigid polyisocyanurate (PIR) insulation board combines excellent thermal efficiency with lightweight construction for easy handling and installation. Suitable for both new build and refurbishment applications, the Celotex XR4165 insulation board helps reduce heat loss and improve energy efficiency in residential and commercial properties. It features low emissivity foil facings on both sides, enhancing its thermal performance further while providing reliable moisture resistance.