Coating extends the life of the roof membrane by protecting it from harmful UV rays that can cause “alligatoring,” as well as reducing heat that causes thermal expansion and contraction. Excessive thermal expansion and contraction can prematurely age the membrane, causing cracks, split seams, and blisters.
To provide energy savings by reducing heat transfer into the building and therefore reducing air-conditioning costs. A dark roof can reach temperatures of over 150°F. A cool roof could drop that temperature by 50°F or more.
To simply add an additional level of protection from leaks.
To improve the appearance of the existing roof by changing it to white or adding a color. This is often done to enhance the appearance of Metal roofs.