2-ply SBS modified bitumen is typically applied using a torch or hot air welding method. The first layer is laid down and heated to ensure proper adhesion, followed by the application of the second layer. This process enhances the waterproofing and flexibility of the asphalt. Additionally, it can be integrated into asphalt mixtures during production, where the modified bitumen is blended with aggregates to improve the overall performance and durability of the pavement.