Painting a wooden house professionally and sustainably

Wooden houses are available in numerous designs with different requirements for the building. However, it is clear that wood should be regularly cared for as a natural product. The painting itself is not the challenge, but rather the choice of the right products. That's why we've put together a guide for you to answer the most important questions about painting your wooden house.

Various wooden house constructions

Wood has always been a popular building material. It conveys wellbeing and naturalness, but also promotes important properties such as the breathing of the wood. As a wooden house thereby different constructions are called.

  • Glulam houses (for example a garden house, but also a residential building)
  • Log houses (houses made of massive round logs)
  • Swedish houses (made of solid wooden beams made of wooden houses, partly also round wood)
  • Wooden facades (wood as facade cladding for a stone house)

Therefore you should definitely paint your wooden house with a wood preservative

First, let it be said that some specialists keep arguing that wood preservatives are not really necessary. Especially in northern Europe and also in the Alps, there are numerous wooden huts and houses that are centuries old and have never been treated accordingly. This is true so far, but in this country not so applicable everywhere - and for aesthetic reasons, probably also rather dissuasive.

On the other hand, a high-quality wood protection varnish must protect

If the wood is not treated against the blue mushroom, it creates a kind of patina that literally seals the wood. However, the fungus can penetrate deep into the wood at higher temperatures, as they prevail in our country, and then damage it. For glued wood there is an increased risk of penetration through the glue layers. In addition, there are even more influences against which you need to protect your wooden house.

  • blue stain
  • UV radiation
  • Moisture and water
  • further weather influences
  • other organic microorganisms and pests

Microorganisms, blue fungus and UV radiation

Biocides that are mixed with the wood preservative are used against the blue fungus as well as microorganisms and pests. So they are essential. In addition, however, the UV radiation is dangerous for the wood. Wood obtains its firmness through a certain "building material" in the wood, the lignin. Lignin is therefore often referred to as the glue that holds the wood together. The UV radiation of the sun destroys the lignin in the wood. By means of an appropriate UV protection, the radiation is converted into harmless heat.

Protection against moisture and water

But moisture and water also attack the lignin by literally washing it out of the wood. To recognize is so far destroyed wood at its increasing gray discoloration. So the wood must be impregnated in any case. The wood preservative used must therefore be able to penetrate into the wood. For laminated wood and solid wood beams, this should be up to 10 mm deep, for round wood around 4 to 5 mm.

The product choice of optimal wood preservatives

Wood protection coatings should be breathable

But wood also always contains a residual moisture. Of course, dried wood still has a residual moisture, which is adapted to the humidity of the environment. But that varies with the weather or the seasons. Accordingly, the wood should have a chance to breathe. The topcoat on the impregnation should therefore be a vapor-permeable wood protection varnish.

Products like linseed oil

In addition, you can also use different products. Again and again, recommendations for linseed oil or similar products can be read. Basically, linseed oil is actually suitable, but not for weathered wood outdoors. There is neither protection against UV radiation nor against microorganisms. Instead, you can divide the wood preservative products into thin-film and thick-film stains. Thin-film wood preservatives are generally products which contain only limited color pigments, ie are transparent or partially transparent.

Thick and thin-layer wood preservatives and synthetic resin coatings

In addition, you can not impregnate with thick film systems. On the other hand, if you want to use a colored lake, you must resort to a thick-layer wood preservative. In order to achieve the necessary impregnation, you must then paint your wooden house in advance with an appropriate depth. Otherwise, the protective function would not be sufficient. Synthetic resin coatings are also only partially suitable. On the one hand, these paints can react chemically with the tree resin of the wood. On the other hand, the wood pores are usually smaller than the resin particles. Thus, a synthetic resin paint can only partially anchor on wood.

The preparatory work

The preparatory work is always very similar to other woodwork. First you have to roast the wood with a suitable sandpaper grain (at least 80), then a fine sanding cycle (from grain size 120). If there are old paintings on the wooden house, you have to remove them first. For this, you usually sand the wood surface. For paints you can use a hot air blower with a spatula. Alternatively, you can pickle. Then clean the wooden house with a suitable grease cleaner.

Tips & Tricks

To paint your wooden house, do not buy the wood preservative according to the lowest priced product. Rather, you must pay attention to the fertility as well as the longevity. For some wood stains you need twice the amount of other products. Other funds have to be repaid annually, others only every 5 to 8 years.

An important component for the longevity of the wooden house is the constructive wood protection. Roofs must therefore have enough overhang to protect against direct sunlight and rain. Front ends of stud posts should be tapered to provide as little floor space for water as possible.

It is essential to use a breathing mask when sanding very old wood preservatives, because until a few decades ago, lead was contained in the corresponding wood preservatives - similar to how weather-resistant metal paints used to mix chromium. Incidentally, the house journal also contains guides and instructions for [painting metal] and other materials.

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