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Ludowici Interlocking Tile Installation Manual <br />27www.ludowici.com <br />Closed Valleys <br />In a closed valley, the tiles from the adjoining roof are <br />mitered and abutted. Since water migrates through a <br />closed valley onto the sheet copper flashing which carries <br />the runoff, this type of construction is considered <br />decorative. <br />NOTE: Underlayment for all valleys must be a full width <br />sheet (36") of two layers of No. 43# coated base sheet <br />or a layer of self-adhesive modified bitumen membrane. <br />Each course from the adjoining fields must overlap the <br />valley underlayment by at least 12". <br />Figure 27.1 Closed Valley Detail With Step Flashing <br />Valley Flashing Pieces Should <br />Extend 11-1/2" from Valley <br />Center Line <br />16 oz. Copper Valley Flashing <br />Attached With Copper Cleats <br />36" Wide Ice and Water Shield <br />Figure 27.2 Closed Valley Flashing <br />Underlayment <br />Let Valley Flashing <br />Overhang Fascia <br />1-1/2" <br />Center Rib Sized <br />1/4" Above Butt of <br />Installed Tile <br />1/2"1/2" <br />10" +10" + <br />NOTE: Closed valleys should not be used where <br />foliage debris can fall onto the roof, accumulate <br />and cause water backup in the valley. <br />Closed valleys should not be used where the rafter <br />length or pitch varies on adjacent roof planes. It is <br />important that corresponding courses align coming <br />into the valley. <br />Ludowici strongly discourages the use of closed <br />valleys in areas with snow fall. Snow accumulation <br />in a closed valley can cause ice dams, damaging the <br />roof tile and creating potential leaks.