One of the most important matters in green wood treatments, such as sap-replacement method, is knowing the longest time available for beginning treatment without losing efficacy. In this paper, the influence of this factor on absorptions and distribution of the preservative into the wood is analized. Tree start-up times were first chosen: 3-6 hours, 48 h and 120 h after being cut down. The treatment was carried out at both butts, with 5% Copper-chrome-fluor salt, in Pinus pinaster Ait. and Eucalyptus globulus Labill. Different behaviour between the two species was noted when the treatment start-up was delayed. Pine loses its highest absorption capacity earlier than Eucalyptus does. The best distribution of wood preservative, in both wood species, was produced starting the treatment 2 days after felling.

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