Planiseal Membrane SA is a 63-mil, self-adhering sheet membrane consisting of 61 mils of rubberized asphalt laminated to a 2-mil PET lm. The combination of these two excellent waterproofing materials provides a durable, high-performance waterproofing membrane. Planiseal Membrane SA is suitable for installations where the ambient and substrate temperatures are above 40°F (4°C).