Durability of Douglasie wood
The Douglas fir (Pseudotsuga menziesii) is a native wood species that comes from sustainably managed forests. The Douglas fir wood best suited for high-quality purposes comes from southern Germany.
Coniferous woods in general
In the case of conifers, the difference between early wood, which grows at the beginning of the vegetation period, and darker late wood, which is formed towards the end of the vegetation period, should generally be noted. The early wood is much softer than the late wood, as the cells grow thinner and with a larger cross-section (large lumen) in order to ensure sufficient water and nutrient transport. The late wood is thicker-walled, has a smaller cross section (small lumen) and forms there increasingly the lignin. The slower the conifer tree grows, the higher the proportion of late wood relative to early wood – this also increases the hardness and abrasion resistance of the wood.
The Douglas fir in special
Coniferous woods are, in contrast to many native or exotic deciduous woods, softer. The Douglas fir, a tree species that can grow up to 60 m high in Europe, is one of the best coniferous species in the country. Due to the already quite respectable occurrence of Douglas fir trees in Central Europe, the increasingly popular wood provides sufficient supply and we like to use it outdoors as terraces & facade wood, but also increasingly indoors as flooring.
Originally from North America, the wood was imported to Europe in the 18th century and is often planted by foresters in our native forests due to its good characteristics. From the point of view of the wood industry in Europe, probably the “best” Douglas fir wood can be found in southern Germany, e.g. in the Black Forest. The comparatively nutrient-poor forest soils make the trees grow only slowly, which leads to the fact that the annual rings (illustrated in the cross section of the tree, see cross section of the solid wood planks) are placed closer and the wood has an excellent hardness, which cannot be surpassed by other domestic coniferous wood species.
In order to increase the value of the wood for later sale, the young Douglas fir trees are pruned by foresters. At the time of felling, i.e. about 80 – 100 years later, the wood outside the delimbed area is knot-free and therefore very homogeneous. This “value-loading” has been carried out in German forests for a long time, which is why today we get particularly beautiful round wood for our production of solid wood planks and terrace planks.