MATERIAL FACTORS FOR HIGH PERFORMANCE

摘要

A safe and long-lasting roof must provide solid resistance to the following inescapable factors: 1) Ultraviolet light UV is the No. 1 enemy of asphaltic and modified bitumen roofs. Both need some kind of granular surfacing or cap sheet to protect the underlying membrane from UV, whereas EPDM membranes resist UV very well. The stabilizers for heat and fire in TPO membranes (and to a lesser degree in PVC membranes) degrade their UV resistance, and manufacturers continue to work on a performance balance. KEE membranes have excellent UV resistance and stabilization due to their versatile polymeric engineering.