Exterior durability of liquid applied roof waterproofing membranes

 
In Europe, liquid applied waterproofing membranes have been dominated by 1k solvent borne polyurethane chemistry. Recently, a water-borne acrylic polyurethane polymer membrane has achieved CE marking, having demonstrated mechanical performance and durability as governed by the associated European Assessment Document (EAD). The external laboratory tests demonstrated 25 year expected working life, but no longer required exterior exposures or real roof demonstrations. Exterior exposures provide valuable information on long-term durability and sustainability, especially for cool roofing membranes. In this presentation, the exterior durability and long-term solar reflectance of a water-borne-acrylic hybrid is demonstrated and compared to best-in-class chemistries available to the market. The correlation between robustness as tested in the laboratory versus in the field will be discussed.