5mm 1/4 Double Poly-Air Insulation is a high reflectivity radiant barrier with reflective aluminum sandwiched between two layers of sand. It is designed for easy cutting and installation and provides a durable insulation barrier that can be stapled or nailed to most surfaces without compromising performance. Key benefits - Superior thermal performance: reflects radiant heat to reduce heat loss in cold seasons and heat gain in hot seasons. - Waterproof and versatile: 100 percent waterproof for use in outdoor and indoor applications. - Easy to install: cut easily and can be stapled or nailed to various surfaces without sacrificing insulation integrity. - Sound control: effectively reduces sound transmission to help create a quieter environment. - Fire and code compliant: ASTM Class 1 / Class A fire rating; meets international fire codes, including Australia. Specifications and materials - Construction: reflective aluminum between two layers of sand - Thickness: 5 mm - Intended use: indoor and outdoor applications - Performance: high reflectivity radiant barrier with durable insulation properties Usage scenarios - Attic or roof assemblies: install as a radiant barrier to improve energy efficiency and maintain temperature consistency. - Exterior walls or under siding: provides weatherproof insulation while helping to manage heat transfer and moisture. - Indoor spaces requiring quiet and thermal control: suitable for garages, workshops, home studios, or small offices where sound reduction and temperature stability are important. Compliance - Meets ASTM Class 1 / Class A fire rating - Compliant with international fire codes, including Australia Notes - Designed to be cut to fit and installed without compromising the insulation barrier - Suitable for both new constructions and retrofit projects in suitable climates and applications