This paper shows the results of treatment of timber in a variation of thehot-and-cold bath process. The studied method was performed in thefollowing way: heating the end sealed samples from timber in an ovenfollowed by an immediate soaking of the timber samples in a cold liquidsolution containing a preservative in order to allow the preservativepenetrate into the wood without using any pressure generatingequipment. Copper, furfuryl alcohol and phenol formaldehyde basedsolutions were used to impregnate the wood samples using this method.The modification was done out by impregnating a layer below the woodsurfaces, which is an intermediate solution between full-bulkimpregnation and simple surface coating of wooden boards. This methodmight be an efficient and economical solution for the industrialmanufacturing of boards used as cladding, decking and flooring.