In this study, the following methods of treatment have been studied: bulking with PEG 4000 in water, methanol and t-butanol solvents: bulking with PEG 540 blend in water; bulking with rosin in acetone; freeze-drying from different concentrations of PEG 400 with variousmethods of pre-freezing; in situ polymerization with glycol methacrylate and with a melamine formaldehyde resin; water displacement with methylene chloride followed by rosin impregnation. They have all been carried out with five groups of waterlogged wood representative of different species and various states of degradation. Freeze-drying, PEG 4000 impregnation in t-butanol and PEG 540 blend impregnation in water gave the most satisfactory results, based on appearance and shrinkage.