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Ludowici Interlocking Tile Installation Manual <br />26 www.ludowici.com <br />Figure 26.1 Valley Flashing Dimensions <br />1/2"1/2" <br />10" +10"+ <br />1"1" <br />Flashing at Valleys <br />Valleys, since they collect the water runoff from the <br />portions of the roof sloping into them, are particularly <br />prone to water migration and leakage. A clear and <br />unobstructed pathway for quick water drainage is <br />essential in valleys. There are two basic types of valleys in <br />tile roof installation: open and closed valleys. Open valleys <br />are the standard and preferred choice as they reduce <br />debris collection and potential water infiltration. <br />Open Valleys <br />In an open valley construction the tiles are held back from <br />the center of the valley to expose the copper flashing. <br />The advantage of an open valley is that it permits <br />unobstructed drainage. Open valleys are recommended in <br />areas with surrounding foliage where the leaves, needles <br />and other debris can fall on the roof and potentially slow <br />or block the runoff of water from the roof (see Figure 26.2). <br />The valley metal is to be secured with approved fasteners. <br />At no time are nails to be placed in the area of the valley <br />that will be carrying water. <br />Figure 26.2 Open Valley Flashing Detail <br />Copper Cleat <br />24" O.C. <br />16 oz. Copper <br />Valley Flashing <br />36" Wide Ice and <br />Water Shield <br />6" Strip of Ice <br />and Water <br />ShieldUnderlayment <br />Figure 26.3 Copper Cleat Detail <br />Let Valley Flashing <br />Overhang Fascia <br />1-1/2"