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Wood protection for exterior - exteriorIn order to enjoy outdoor wood for a long time, it must be protected. Sun and moisture, temperature fluctuations and frost put the wood.
It can turn yellow and gray, it can crack, it can rot and mold. Even before any treatment with wood preservatives, the wood protection comes through material and construction. If a treatment by external wood protection is desired, which is also conceivable for aesthetic reasons, make sure that you use wood preservatives that bear the quality mark RAL-GZ 830 of the quality group Holzschutzmittel e.V. These remedies have proven to be effective but environmentally sound and harmless to health.
Different wood protection in the outside area for different woods
Outdoor conifers are threatened by a special fungus, the so-called blueness. If you use wood that is not suitable for outdoor use according to the durability class, a blue stain primer must be used, it protects the wood by biocides against the fungal attack. Please use therefore sparingly and observe the safety instructions. At the same time it reduces the penetration of water. Afterwards, glaze or wood paint must be painted on such woods against UV radiation and moisture. With this layer you achieve a decorative, but also effectively protected surface.
If you use hardwoods that are not classified for outdoor use according to the durability class, you do not need a blue stain primer, but they can
impregnated with an impregnation. This protects them against decay, fungal attack, mold, pests and water and still makes them
hardly inflammable. In addition, the impregnation makes the wood consistently absorbent for the subsequent color. Then the protection is completed by glaze or wood color.
External wood protection means constant provision
The treated wood should be thoroughly inspected for damage once a year. A test signals the need for action: If the wood discolors under the protective glaze, if you expose it to moisture for a few minutes (for example, through a sponge soaked in water), the glaze has let moisture through. Then something has to be done, usually you just need to remove loose parts, grind the rest and then glaze or varnish.
Glaze, wood color or paint?Glazes provide a transparent color coating, in which the wood structure and grain are visible and emphasized. Open-pored glazes allow the wood to breathe. Through a glaze with color pigments, plain woods can be optically transformed into high-quality mahogany. Glazes are easy to work and to renovate. Wood colors cover, the ground no longer shines through, but the wood structure remains visible. Wood colors are breathable and moisture-regulating, they do not peel off and do not tear. The wood is optimally protected against solar radiation. Varnishes are transparent or colored, form thicker layers than the aforementioned paints and result in a smooth surface that completely disappears the wood structure. Paints can crack or peel off and cause a considerable renovation effort.
A wood insulation primer may be required as a barrier if you want to treat very old woods, where already color changes are due to the old protection.