SBS modified bitumen membrane roofing is applied through a multi-step process. First, the substrate is prepared by ensuring it is clean and dry. The membrane is then rolled out and positioned. Heat is applied using a torch or hot air to activate the SBS polymer, allowing it to bond with the substrate. Overlapping seams are melted together to create a waterproof seal. Finally, the membrane is pressed down to ensure proper adhesion and eliminate air pockets, ensuring durability and performance.