3 Most Commonly Used Roof Flashing in Australia

Roof flashing in Australia is generally used to provide extra protection to the roof, especially for the areas that are more prone to seepage. Water is directed away from the interior of the structure to the topside of the roofing material. It is mainly used to direct the flow of water that could leak from the intersections or joints.

Galvanised metal or aluminium is used in making of these materials, which are used in chimneys, skylights, HVAC units, roof valleys, roof decks, soil and vent stacks. They are quite effective just like foil wrap insulation in providing padding for electrical devices.

Most of the roofing systems consist of various components like sheathing, underlayment, roofing material, roofing intersection, flashing details and ventilation. It is crucial that each of these items are installed for the system to work as per expectations.

Damaged or improper installation of roof flashing would cause roof leaks, especially in areas around the chimney and dormer. In a few cases, faulty installation could lead to rotting of wood and deck collapse also.

As per the areas and the materials used for roofs, the type of roof protection differs.

Few of them include:

• Continuous flashing: This type is also known as apron flashing. A single long piece of metal is used to carry water, down the shingles. It becomes difficult to expand this flashing, while home expansion. The metal contracts in winter and does not function properly. If not treated immediately, it could warp and fail to perform its function.

• Base flashing: Areas like chimneys would need two pieces of flashing, mainly to ensure that the rain can be directed downwards safely. This difficult to install roof protection would expand and contract with weather changes. Double protection ensures that the whole system stays secure.

• Step flashing: This rectangular piece of flashing is bent at 90 degrees at the centre. They are mainly used in areas where the wall and roof are connected. Multiple layers are used with the help of shingles to ensure that water flows away.

Though there are other types of flashing, these three are the main and most commonly used in houses and commercial places.