Felts or Mats: BUR typically uses multiple layers of reinforcing materials like fiberglass or organic felts. These layers provide strength and stability to the roofing system.

Bitumen: Asphalt bitumen serves as the waterproofing agent in BUR. It holds the layers of felts together and provides a waterproof barrier against moisture.

Surfacing: BUR roofs are commonly surfaced with aggregate (gravel) or a cap sheet. The surfacing protects the bitumen from UV radiation and physical damage while also providing additional fire

Preparation: The roof deck is prepared by ensuring it is clean, smooth, and dry. Any necessary repairs or adjustments to the substrate are made before starting the BUR installation.

Layering: Layers of roofing felt or mats are laid down onto the roof deck. Each layer is mopped or adhered using hot asphalt or cold adhesive.

Bitumen Application: Hot bitumen is applied over the felts, and a roofing mop or spreader is used to evenly distribute the bitumen across the surface.

Repeating Layers: The process is repeated with alternating layers of roofing felts and bitumen until the desired number of layers is achieved, typically 3-5 layers.

Surfacing: Once the layers are complete, the roof surface may be covered with a layer of aggregate (gravel) embedded in hot bitumen or a cap sheet adhered with cold adhesive.