Double diffusion process was applied to the treatment of small sound sapwood specimens [20(T) x 20(R) x 10(L) mm³] of Cryptomeria japonica D. Don. The specimens were consecutively dipped in the two kinds of acqueous solutions to form water insoluble deposits within the wood after an expected reaction between the solutes. Following the comparison of deposits formed and treating conditions (temperature and solution concentrations), BaHPO4 as a water insoluble precipitation performed best against decay fungi (Coriolus versicolor and Tyromyces palustris) and subterranean termites (Coptotermes formosanus Shiraki) in the standardized laboratory tests. Addition of boric acid enhanced the performance of the wood inorganic material composites. Relatively low weight percent gain by deposits (<3%) was proved effective in controlling biological deterioration of the treated samples when boric acid was added to the treating solutions

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