The degradation degree of a wooden structure has a direct influence on its loss of mechanical strength. It's necessary to deepen in non destructive techniques which permit to extrapolate the results obtained in laboratory to structural timber used in the building's construction. This work studies the relationship existing between the pulse velocity of ultrasonic waves and the weight loss suffered by samples of two different wood species (Pinus sylvestris and Fagus sylvatica) exposed to attack of two fungi representatives of white rot and brown rot (Coriolus versicolor and Gloeophyllum trabeum) during the time (1 to 5 months). The results demonstrate that decay produces a progressive decreasing of ultrasonic velocities that runs in direct relation to weight loss.

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