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R905.7.6 Valley Flashing
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Roof flashing shall be not less than No. 26 gage [0.019 inches (0.5 mm)] corrosion-resistant sheet metal and shall extend 10 inches (254 mm) from the centerline each way for roofs having slopes less than 12 units vertical in 12 units horizontal (100-percent slope), and 7 inches (178 mm) from the centerline each way for slopes of 12 units vertical in 12 units horizontal and greater. Sections of flashing shall have an end lap of not less than 4 inches (102 mm).
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Residential Code for one- and two-family dwellings of the Texas Industrialized Housing and Buildings Program > 9 Roof Assemblies > R905 Requirements for Roof Coverings > R905.6 Slate Shingles > R905.6.6 Flashing