Alternative species and preservatives for wood roofing: laboratory decay studies

Western hemlock, Pacific silver fir, and western white pine are being considered for the production of shakes and shingles. These species lack natural durability, thus preservative treatment is required. Using decay test procedures as described in ASTM D 2017, it was demonstrated that these species could be treated with several preservatives to achieve a level of decay resistance that is equivalent to that exhibited by species with natural decay resistance categorized as either resistant or highly resistant.

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