a method for treating wood in which the wood to be treated is placed in a chamber in which a vacuum is produced , where the chamber is filled with a hardening product , in particular a monomer , so as to impregnate the wood by causing the product to penetrate the space between its fibers , where the product is hardened , in particular by polymerization . this method is characterized in that the wood impregnating operation is preceded by a step of controlled thermal treatment .