Abstract: An external roofing surface comprised of foam is non-ignitable, insect resistance, very strong and extremely lightweight. The foam is also easily shaped by a number of shaping techniques, which allows for a more aesthetically pleasing appearance and can be used to make a roofing system that interlocks and has channels for underside ventilation. The foam may also optionally be reinforced with various materials to increase the strength and durability. The foam may optionally be coated with a material to impart a desired strength, durability and/or aesthetic look.