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The template has a wave pattern with a 2 9/16-inch wave height...

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...and a 21 1/2-inch frequency. The vertical lines represent the 2 1 1/16-inch wave offsets between courses.

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With the base course butted to a straightedge...

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...a worker marks the shingles for two rows of drywall shims.

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The shims are glued to the shingles with hot melt adhesive.

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After the shims are in place, applying pressure with a roller improves adhesion.

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