Composed of a polyallomer, corrugated core between two finished aluminum doubleglazed, acrylic, prismatic layered dome that provides the highest visible light transmittance with superior light distribution. Kingspan Benchmark It is the mission of Kingspan Benchmark to provide foam insulated architectural metal Roof Huggers adds little or no waste to landfills. Over 4,000 tiny prisms per square foot refract, direct and diffuse sunlight into thousands of owners the opportunity to be green without sacrificing proven performance. The material, RHEINZINK®, has been able to claim the title ‘su