Flashing
Definition
Flashing is thin metal sheeting (typically Colorbond, lead, or zinc) custom-formed and installed at roof junctions, penetrations, and transitions to prevent water ingress at these vulnerable points.
Understanding Flashing
Wherever a roof surface meets a wall, chimney, skylight, vent pipe, or another roof plane, there is a potential entry point for water. Flashing is the weatherproofing solution for all of these transitions. Roof flashing is typically formed from Colorbond steel, lead sheet, or zinc, and is custom-bent to suit each specific junction. Common types include step flashing (used where a roof meets a vertical wall), apron flashing (horizontal transition at the base of a wall), soaker flashing (hidden behind cladding), and penetration flashing (around pipes and vents). Proper flashing installation requires a thorough understanding of water behaviour on roof surfaces. Water does not simply flow downhill — it can be driven upward and sideways by wind pressure, drawn along surfaces by capillary action, and redirected by surface tension. A well-designed flashing system accounts for all of these forces, incorporating adequate upturns, overlaps, and drainage channels to ensure water is always directed away from vulnerable junctions. In Gippsland, flashing failures are one of the leading causes of roof leaks. Common issues include corroded or rusted flashing on older galvanised installations, lifting or separation due to thermal expansion, and poor original installation where inadequate overlap or missing sealant allows wind-driven rain to penetrate. Town & Country Roofing manufactures custom flashings on site using a portable brake press, ensuring a precise fit for every junction.
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