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A roofing valley is the area where two planes of a roof come together. Since rainwater running off a roof tends to accumulate in the valleys as it runs down, it’s important the valleys be properly sealed and shingled. This prevents any water getting under the shingles. There are two approaches to shingling valleys - a "closed" valley where the valley is covered over with shingles and the water simply runs down the surface - and an "open" valley where a water proof trough is created along the valley to channel the water off the roof. Both methods have been used for years but closed valleys have become more popular with the development of waterproof shield materials.
Auckland Spouting & Guttering can assist you with all your roof valley problems and solutions!