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Grooved and foiled insulation board, 16mm thick and 1200mm x 600mm in size, offers superior thermal efficiency. It features four grooves at 150mm centres and light bulb returns. Made from extruded polystyrene-grade XF250, this board ensures durability and strength. Perfect for various insulation applications, it effectively reduces heat loss and enhances energy efficiency. The grooved design provides easy installation and secure fitting. Ideal for both residential and commercial use, this insulation board helps create a comfortable indoor environment. It's a reliable choice for anyone looking to improve building insulation performance.. Grooved & Foiled Insulation Board 16mm - 1200mm x 600mm x 20mm (Box of 12) JTM JTMBOARD