The keyways between the shingles are at right angles to the flow of water and trap debris. Note lifted shingle tabs and debris accumulation. (See A Well Woven Valley)

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How Not To  Weave A Composition Shingle Valley Possible Indications of a defective drainage system How to catch a wood roof on fire Check your gutters and downspouts after it rains #1 Check your gutters and downspouts after it rains #2 Exposed felt between shakes A Well Woven Valley Don't climb that ladder! Coating compatibility is important A cricket in name only

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