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Ludowici Interlocking Tile Installation Manual <br />29www.ludowici.com <br />Flashing at Open Valley at Main <br />Roof to Dormer Juncture <br />For flashing where an open valley occurs at the <br />intersection of a dormer roof and the main roof, the <br />following steps should be taken. <br />1. The main roof tiles should be installed to just above <br />the lower end of the valley, where the valley and the <br />main roof intersect. Along the roof and wall juncture, <br />step or channel flashing must be used and the last tile <br />in the course should fit closely against the wall of the <br />dormer (see Figure 29.1). <br />2. The bottom end of the copper valley flashing should be <br />cut so that it extends 1/2" below the down-slope edge <br />of the dormer roof deck at the bottom of the valley. <br />This lower cut edge should project a minimum of 2" <br />below the intersection of the dormer and main roof. <br />16 oz. Copper Valley <br />Approximately 24" Wide <br />16 oz. Copper Step Flashing <br />4" Minimum 16 oz. Copper <br />Apron Flashing <br />16 oz. Copper Counter Flashing <br />Figure 29.1 Open Valley at Main Roof to Dormer Juncture <br />2" Extension <br />1/2" Minimum <br />Extension <br />Step Flashing <br />2" Minimum <br />Extension <br />Figure 29.2 Open Valley at Main Roof to <br /> Dormer Juncture Close-up <br />16 oz. Copper Counter Flashing