The study reported the increase of dimensional stability against water of the main Spanish timbers, both broadleaved and coniferous, after impregnation in the autoclave with organic protector, with contains 33.3% water repellent waxes and resins. The proposed Spanish standard, U.N.E. n° 56541 is used, where dimensional stability of the impregnated wood is expressed as a% of that of the non-impregnated wood. Account is taken of the effects of lamination on dimensional stability, cold resorcin glues bring used for lamination. A series of curves representing swelling againts immersion time were thus obtaines, as well as the dimensional stability value for each species. The highest values were achieved with coniferous laminated and the lowest with non-laminated broadleaved timbers (Dimensional stability).

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