Staff Answer
May 26, 2026 - 03:06 PM
The manufacturer certifies that EcoStar Glacier Guard 100 Roofing Underlayment does not contain PFAS or potassium. The Technical Data Sheet confirms it is Class A Fire Rated (ASTM E-108). Please note, for a complete Class A fire rated roof assembly, both the roofing tiles and the underlayment—such as Glacier Guard 100—must be Class A rated.
