Historical
NSF/ANSI 347-2012a
Sustainability assessment for single ply roofing membranes
This version of the Standard incorporates the following revisions: Normative references have been updated. Sections 5.7, 5.8 and 6.5, and 7.3.2.1, 7.3.2.3 and 7.4.1 have been modified to improve clarity
NSF International [nsf]