Understanding NSFS 347 2021: A Comprehensive Guide
, this standard provides a rigorous, third-party verified framework for evaluating the environmental performance of roofing materials like PVC, TPO, EPDM, and KEE throughout their entire life cycle. The Evolution of Sustainable Roofing
Main sustainability categories and criteria
- Material composition and chemical restrictions
Based on the number of points earned, products are certified into one of four levels: Sika Achieves Platinum Certification Again for NSF/ANSI 347
: Use of recycled content and environmentally preferable materials. Product Manufacturing
How to Comply with NSFS 347 2021
B. Design and Construction
- Joint Integrity: The coupling design must ensure a leak-tight seal.
- Pull-out Resistance: The connection must resist pull-out forces. Couplings must have a mechanism (e.g., grab rings, teeth) that securely holds the pipe in place without damaging the pipe wall.
- Pressure Distribution: The design must distribute stress evenly to prevent pipe deformation or cracking.
NSF/ANSI 347: The Architect's Guide to Specifying ... - Duro-Last
4. Dimensional Tolerances
Gaskets must meet ANSI/ASME B16.21 or ISO 7483 dimensions, with a new allowance for thermal expansion in PTFE-based materials. The 2021 edition adds a maximum warpage of 0.5 mm per 100 mm of gasket length.
