Comparison Of Laboratory And Field Methods To Evaluate Durability Of Preservative-Treated Shakes

Rodney C. De Groot


Environmental concerns and life-cycle requirements of treated wood products require methods that define the minimum amount of preservative that will be needed to protect products in use. This study illustrates the relative merits of three methods that are used to evaluate the durability of treated wood shakes. Severity of challenge from decay fungi is greatest in laboratory soil jar methodology, next greatest is in field modules composed of stacked shakes, and least is in shakes exposed on small sections of roof decks in the field. Small sections of roof decks allow assessment of stability, color, and other weathering characteristics. Modules of stacked shakes allow opportunities to design field experiments to evaluate effectiveness of preservatives with a test unit that is conducive to decay.


Preservative;shakes;wood decay

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