WHAT DO UL 2218, ASTM D3161, AND UL 790 MEAN FOR YOUR ROOF?
UL 2218, ASTM D3161 and UL 790: What Do These Numbers Mean? Roofing marketing is full of phrases like: tested proven storm resistant But tested for what? Against what standard? Three performance standards homeowners may encounter are: GoNano publicly cites testing of its nanotechnology treatment under these standards. UL 2218 — Impact Resistance UL 2218 […]