Pour and rollHot bitumen is poured (or applied by a mop) in front of the roofing felt roll, which is then unrolled into the bitumen, spreading it to give a continuous coating for the full width. Most bitumen roofing is applied with minimum 50 mm side laps and minimum 75 mm end laps.
Torch applied
A torch flame is played on the underside of the roll until a molten coating runs downs to form a continuous flow. The felt is then rolled forward into the flow of the bitumen, whilst the torching operation continues, allowing continuous bonding and ensuring that air is not trapped under the roofing.