Patching a modified bitumen membrane roofing involves applying a compatible asphalt or bitumen-based adhesive to the damaged area. First, the surface is cleaned and prepared to ensure proper adhesion. The patch, typically a piece of modified bitumen membrane, is then heated using a torch or hot air, allowing it to bond securely to the existing membrane. Finally, the edges are sealed to prevent water infiltration, ensuring a durable and weather-resistant repair.