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It’s made with modified expanded polystyrene; a rigid foamed plastic with resilient closed cells. The benefits include permanent R-value inherent water resistance excellent physical strength and dimensional stability. The high R-value at a comparatively low cost makes it a perfect insulation choice for the roof perimeter cold storage exterior and cavity wall insulation. Energy efficient expanded polystyrene EPS R-value approximately 4 per in. High-impact polystyrene HIPS laminate Kerfing for quick and easy installation Easy-to-follow DIY instructions included Pieces offer clean professional appearance and are washable for easy maintenance Kit covers one standard 9 ft. wide garage door; a two-car or two-door garage requires two kits Each piece measures 20 in. W x 54 in. L x 1-1/4 in. D The right insulation can save on energy and heating and cooling bills.