Above ground performance of preservative-treated western wood species

Abstract

Incised and non-incised Douglas-fir, western hemlock, and ponderosa pine L- joints were treated with ammoniacal-based pentachlorophenol, chromated zinc chloride, thiocyanomethylthiobenzothiazole (TCMBT) or TCMTB plus methylenebisthiocyanate or 3 iodo-2-propynyl carbamate with or without chlorpyrifos to retentions between 0.8 and 6.4 kg/m3 and exposed, uncoated, above ground on a test fence located in Corvallis, Oregon. Additional joints dipped in solutionsof zinc naphthenate were similarly exposed. Wood condition was assessed annually over a 12 year period. As expected, untreated ponderosa pine decayed most rapidly, while untreated Douglas-fir only began to exhibit substantial decay after 6 to 8 years of exposure. Preservative treatment markedly improved the appearance of the L- joints regardless of wood species. Incised L-jointsperformed similarly to treated, but non-incised samples. The results illustrate the marked improvement in performance produced by preservative treatment of western wood species.

Citation

Morrell, Jeffrey J.; Miller, D.J.; Lebow, Stan T. 2000. Above ground performance of preservative-treated western wood species. Proceedings of the Ninety-Fourth Annual Meeting of the American Wood-Preservers'' Association ... Scottsdale, Arizona, May 17-19, 1998. Volume 94. Granbury, Tex. : American Wood-Preservers'' Association, 2000: Pages 249-256