Polymer modified bitumen sheets are applied in asphalt or bitumen modification processes by first heating the bitumen to the required temperature. The polymer sheets are then integrated into the bitumen matrix, either by direct blending or through a mechanical process. This enhances the elasticity, durability, and resistance to temperature variations. The modified bitumen is then used in various applications, such as road construction or roofing, ensuring improved performance and longevity of the asphalt layers.