In this research Scots pine sapwood L-joints were treated with organosilicons and organosilicons in combination with biocides. These L-joints were prepared and exposed according to the accelerated L-joint method. They were inspected each season for fungal discolouration and removed from the rack after three years outdoor exposure. Subsequently the moisture content, mass loss and decaline uptake were determined. In underlying paper only moisture contents and mass losses are reported. The results show that all organosilicons are able to reduce both parameters measured. In one case a moisture content of less than 20 % was reached, leading to no significant mass loss of the specimens. Addition of a biocide further reduced fungal attack, but did not lead to such low moisture contents as when the organosilicons were applied alone. This study therefore shows that organosilicon treatments can positively influence the performance of L-joints exposed outside.

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