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Valleys are the part of a roof structure that join one slope to another. Valleys can be formed of zinc, aluminium or lead. Lead valleys must be formed of layered strips of lead no longer than 1m per strip and of code 5 or higher. Any longer in length and splitting is common. The most common faults in zinc or aluminium valleys are incorrect installation and slipped tiles or slates piercing the valley. Valleys on tiled roofs must have an appropriate channel for the water to flow freely. It is quite common for tiles to be close-cut, which causes problems with dirt and leaves creating dams and the water rising up the sides of the valley lining rather than flowing correctly.