NSF/ANSI 347: Sustainability Assessment for Single Ply Roofing Membranes was developed by the NSF National Center for Sustainability Standards (NCSS) through a consensus-based public process with a multi-stakeholder group of participants. This standard communicates accurate and verifiable information about the environmental and social impacts associated with the production and use of single ply roofing membranes. Based on life-cycle assessment principles, NSF/ANSI 347 employs an easy-to-use point system to evaluate roofing membrane products against established prerequisite requirements, performance criteria and quantifiable metrics in five key areas: Product design, Product manufacturing, Membrane durability, Corporate governance and Innovation.