Thermal Laminate 2400x1200x37.5mm PIR - PIR Laminate Is A Layer Of PIR Insulation Bonded To A 9.5mm Wallboard. Offers the highest thermal performance (Thermal Conductivity: 0.023W/mK), reducing the thickness required. This cost-effective solution is ideal for use in refurbishment, new build and room-in-roof situations where an enhanced level of thermal insulation is required.