What type of roofing system is adhered by heating with a torch?

Bituminous roofing systems are constructed from bitumen, a sticky, black substance derived from petroleum. This type of roofing is designed to be installed using a torch application technique, where heat is applied to the membrane and the underlying surface to create a watertight seal. The heat causes the bitumen to soften and adhere to the substrate, ensuring a durable bond.

In contrast, metal roofing systems rely on mechanical fasteners or clips for attachment rather than heat. Rubber roofing systems, which often utilize EPDM or TPO materials, are typically attached using adhesives or ballasted methods instead of torches. Shingle roofing systems generally involve asphalt or fiberglass shingles that are nailed down rather than adhered through a heating process, making them unsuitable for torch application. Thus, bituminous roofing is the only option that utilizes a torch for proper installation and adhesion.