Roof flashing is an integral part of any roofing structure and works to prevent the passage of water into the structure from a joint.

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Flashing is used to decrease water penetration at joints such as chimneys, vent pipes, walls that abut roofs, and window and door openings.​ There is apron, chimney, and step flashing.

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Lead is the most common product for flashing, although other materials, such as aluminium, can also be used. 

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Alcan flashing is an alternative to lead flashing. It is manufactured from a soft conditioned aluminium, which is highly resistant to corrosion and possesses excellent weld and workability properties ensuring it is perfect for roofing applications.