Modified bitumen roll roofing is applied using a torch-down or cold adhesive method. In the torch-down process, a propane torch heats the underside of the membrane, allowing it to bond directly to the substrate. Alternatively, cold adhesive involves applying a special adhesive to the roof surface before rolling out the modified bitumen. Both methods ensure a strong, waterproof seal, enhancing durability and resistance to environmental factors. Proper surface preparation is crucial for optimal adhesion.