Refurbishment or replacement of defective or problematic roof coverings is a common problem. Stripping off the existing roof covering and replacing it is can be an expensive proposition and a logistical nightmare. Liquid roofing involves the application of a monolithic, liquid polyurethane coating to a roof. The coating cures to form a rubber-like elastomeric waterproof membrane, which is fully bonded to the existing roof covering and capable of stretching in order to accommodate movement in the roof. The coatings can be applied over most traditional roofing materials, including felt, asphalt, bitumen, and concrete