Abstract
In this study, the durability of 230 wood panels, consisting of both Scots pine (Pinus sylvestris) and Norway spruce (Picea abies), were examined in an above-ground durability field test, for two years, in southern Sweden. The samples consisted of three pieces of wood, 22×95×500 mm3. The pieces were screwed together with an overlap so as to obtain an efficient moisture trap. The results of the durability test showed large differences between Scots pine sapwood and heartwood. Sapwood displayed unacceptably high moisture contents and fungal discoloration, while heartwood had low and stable moisture contents, and lesser discoloring. Norway spruce had moisture dynamics similar to pine heartwood, although a some what higher moisture content was recorded. The differences in moisture dynamics among the spruce samples, which were divided into: juvenile wood, mature wood with horizontal annual rings, and mature wood with vertical annual rings, were small. Juvenile wood showed more discoloring caused by mould fungi. The samples with horizontal annual rings suffered massive cracks.
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