Evaluation of protective treatment for field-drilled bolt holes

Field drilling of preservative-treated wood breaks the protective barrier provided by the treatment, permitting coloration by decay fungi. Pentachlorophenol (penta) was formerly used to protect against this damage, but many utilities have discontinued use of this chemical for remedial purposes. Four potential penta replacements were evaluated in Douglas-fir poles over an 8-year period. The water-soluble chemicals ammonium bifluoride, Timbor?, and Boracol? provided the highest degree of protection to the field-drilled bolt holes.

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