35mm Multi Wall Polycarbonate Sheets - Available in Clear, Bronze, Opal and Athermic Heatshield colour shades. Ideal for when greater rigidity, strength, loading and wider spanning capabilities are required for Conservatories, Car Ports, Smoking Shelters, Covered Walkways and Garden Extensions. U Value = Aprox. 1.4W/m2k. Class 1 surface spread of flame. 10 year guarantee against discolouration, ageing and resistance to hailstones.