Unisil HS Roof Coating is an ultra-high volume solids, solvent free, pure elastomeric silicone coating that provides superior weatherproofing, ultraviolet resistance, biological resistance and fire retardancy over polyurethane foam insulation and other appropriate substrates. The pure silicone polymers are naturally fire retardant to provide long-term fire resistance, while the surface finish resists the attachment of algae, mildew and mold organisms.