Serviceability of Douglas-Fir Shakes After 22 Years on a Roof in Western Oregon

Shakes sawn from Douglas-fir were inspected after 22 years of service on a roof in western Oregon, an area rated intermediately favorable for decay of wood used aboveground. About 2 percent of the 589 shakes inspected needed replacement, but overall appear ance of the roof was still good. Serviceability of the shakes was probably enhanced by their substantial thickness as well as by occasional cleaning of the roof and its good exposure to sun light and air.

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