The effects of preservative treatment on fastener withdrawal was investigated in Douglas-fir lumber conditioned to two moisture regimes. In general, conditioning samples to 19% moisture content produced more substantial changes in withdrawal resistance of galvanized fasteners than did conditioning to 12%. Treatment had little or no effect on withdrawal resistance of stainless steel fasteners. Withdrawal resistance of galvanized fasteners steadily increased in ACZA treated samples conditioned to 19% and there was evidence of corrosion where the fasteners contacted the wood. The potential for long term effects on fastener integrity are discussed and the potential for future studies are explored.

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