Valleys · Buninyong, Lake Wendouree, Canadian
Rusted valley irons and gutter overflow in Ballarat
A roof valley is the V-shaped metal channel where two slopes of a tiled roof meet. It carries a lot of water — and when it rusts or clogs, ceilings flood fast.
What the valley does
Valleys act like internal highways, collecting large volumes of rainwater off two slopes and channelling it into the gutters. On a tiled roof the valley is usually a long strip of galvanised metal running under the tile edges.
How it fails
Over twenty to thirty years the metal develops hidden rust patches and pinholes. Leaves and twigs also build up into a natural dam, especially under overhanging trees. In a sudden downpour the blocked or holed valley overflows its shallow edges and water pours straight into the ceiling.
The fix
This is licensed roof-plumbing work in Victoria. A roof plumber lifts the surrounding tiles, clears the blockage, and installs a wider, deeper, rust-resistant valley tray before re-laying the tiles.
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