Building and Engineering Catalog 1921 Edition . £ inches fromthe butt. Start the first course with full shingle andlay full shingle across the roof. Start the secondcourse with two-thirds shingle and lay full shingleacross the roof. Start the third course with one-third shingle and lay full shingle across the roof. By following this method and being sure tolay the shingles 5 exposed to the weather andspaced l/2 apart, the full beauty of the seductiveshadow line will be

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