In-Place Treatments for Control of Decay in Waterfront Structures

Douglas-fir heartwood planking not in soil contact was protected from decay by flooding the top surface with pentachlorophenol or fluor-chrome-arsenic-phenol (FCAP). Only FCAP protected southern pine planking (mostly sapwood). A fungicide supplementarily applied to the tops of creosote-treated Douglas-fir pile cutoffs covered with a cap protected the heartwood from decay. After 10 years just one fungicidal treatment, ammonium bifluoride in holes on the pile top, prevented decay in all those cutoff piles not covered with a cap.

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