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Implementing proper flashing techniques can protect your roof against water ingress. If done poorly, you may suffer the daunting aftermath of leaks, such as expensive property damage.
Let’s take a look at some effective flashing techniques below:
Step Flashing
Step flashing is an important technique used where a slanted roof meets a vertical surface, such as walls or chimneys. It involves L-shaped metal pieces that direct water away from these intersections to ensure a watertight roof.
Step flashing is typically made from galvanised steel or aluminium and applied from the base of the roof slope upwards, where one side of the flashing extends up the wall while the other lies flat on the roof.
Using roofing screws or nails, the flashing is secured and then overlaid with the next piece of flashing, creating an overlap. Finally, all joints are sealed with waterproof sealant along the edges to prevent leakage.
Counter Flashing
Counter flashing protects the upper edge of base flashing at junctions and intersections, particularly on tiled roofs, to prevent water infiltration.
The first step is to install base flashing at the roof-to-wall junction or around chimneys and other protrusions. Once secured, the counter flashing should be cut to size. Whether lead, copper, aluminium, or galvanised steel, the counter flashing should be secured over the base flashing and embedded into a groove cut into the masonry.
To seal the groove or reglet, a quality roofing sealant will be applied to prevent water from leaking in from behind the counter flashing. This kind of flashing provides long-lasting protection against leaks and shields the base flashing from exposure, thus extending its lifespan.
Valley Flashing
Valley flashing is needed where two slopes meet on a roof, creating a funnel or channel for water to flow safely off the roof and into the gutters. Properly applied valley flashing prevents leaks in these vulnerable areas.
First, the valleys are cleaned before applying an underlayment, such as a self-adhering waterproof membrane, for additional protection. Then, the flashing is installed, which is typically a wide strip of galvanised steel, aluminium, or copper along the length of the valley. Flashing will be fastened with roofing nails, and sealed along the edges with a quality roofing sealant.
To finish, a membrane will be placed over the valley flashing and secured with adhesive. This method effectively directs large flows of water away from the roof and into the gutters, ensuring a watertight roofing system.
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