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Valley, valley gutter
A valley is the term used to describe where two roofs meet at the lower line, either on a slope, or horizontally. The line of intersection is a weak point in any roof system, and potentially a point where water can penetrate the building. Valley gutters are often formed in lead. They need regular monitoring. They should be kept clear of leaves and other debris. Fine cracks in the leadwork can cause water penetration, and hence rot in the underlying timber
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