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Shedding water off the roof is absolutely crucial at valleys, where two roof slopes are directing all the water they collect to the same point. A poorly designed valley can quickly lead to significant damage. Westlake Royal™ Roofing Components developed the Ribbed Valley Metal and provides nothing less to insure a free-flowing valley that will protect the structural integrity of the roof valley. W-valley metals, designed for wood shakes and asphalt shingles do not prevent clogs and direct water into the roof system, which can damage the underlayment and cause the roof deck and underlying structure to rot.
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