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David Mills OLYMPUS DIGITAL CAMERA

I appreciate your magazine and have relied on it for guidance for many years. I have been building a lot of garden sheds this year and am doing a fair amount of cedar-shingle siding and roofing. I read with interest the letter from David Mills, “Wood Shingle Roofing Tips” (6/12), in which he refers to “verticals” and “skippers.” What do those terms mean?

I’ve often noted that on the underside of cedar shingle roofs there’s a fair amount of seeping, especially in older buildings. New materials like OSB would never survive that treatment for long, but the roofing boards last indefinitely as long as they can dry.

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