Torch-on roofing consists of two or more layers of modified asphalt that are usually melted together by a torch. This creates a roof that is resistant to ultraviolet light and a waterproof barrier.
The torch-on roofing is usually used for low-slope roofs where snow or rain can easily collect and sit for long periods of time. It covers the entire roof at an even thickness, usually about 3-4 mm thick, while traditional tar roofs can have bumps, thinner, and thicker spots.
The material used in applying a flat roof is technically known as ‘Bitumen’, but more commonly known as asphalt. Bitumen by itself is perfect for roofing, as it has good water proofing qualities; however, Torch applied roofing needs to have something added to it to stabilize its inability to expand and contract.
Bitumen is a term applied to both coal tar pitch and asphalt products. Modified bitumen membranes are hybrids that combine the high technology formulation and prefabrication benefits of single-ply with traditional roofing installation techniques that are used in built-up roofing. These membranes are factory-fabricated layers of asphalt that are modified using a plastic or rubber ingredient and are combined with a reinforcement.