The features of our timber
- Naturally and responsibly grown raw material
- Eco-friendly
- Water-saving (when compared to brick-and-mortar houses)
- Unique designs
- Good stability
- Relatively light (when compared to stone or iron)
- Easy to modify
- Versatile
Wood characteristics
which do not constitute a reason for a reclamation
![](https://bertsch-holzbau.eu/wp-content/uploads/2024/03/14415_1_wood_features-01.png)
Crack formation
According to the norm DIN 4074, cracks resulting from drying (possible due to varying timber structures) are allowed, as mechanical properties and durability are not negatively affected.
![](https://bertsch-holzbau.eu/wp-content/uploads/2024/03/14416_1_wood_features-02.png)
Crack formation
Cracks in 3-layer panels resulting from drying are a natural behaviour and are permitted (there is a higher chance of these occuring if the surface has been painted over in dark, solid colours), as mechanical properties and durability of the panels are not negatively affected.
![](https://bertsch-holzbau.eu/wp-content/uploads/2024/03/14417_1_wood_features-03.png)
Knots and grain
![](https://bertsch-holzbau.eu/wp-content/uploads/2024/03/14418_1_wood_features-04.png)
Timber turning gray and blue
The timber material has a level of moisture 14-16% when it leaves the factory. The moisture level can increase due to absorption from the surroundings of the building site. From the moisture level approx. 18% blue spots may start to appear. To prevent this, a primer with protection against blue stains has to be applied.
![](https://bertsch-holzbau.eu/wp-content/uploads/2024/03/14419_1_wood_features-05.png)
Expanding and shrinking
It is a completely normal behaviour. Untreated timber changes its size more than treated or painted timber.
![](https://bertsch-holzbau.eu/wp-content/uploads/2024/03/14420_1_wood_features-06.png)
Resin leaks
Resin leakage in coniferous timber, like Scandinavian spruce, is unavoidable, especially when exposed directly to sunlight and warm weather.
![](https://bertsch-holzbau.eu/wp-content/uploads/2024/03/14421_1_wood_features-07.png)
Pith
Made of porous fabric and is a natural part of the timber. Pith is located in the core of the trunk and does not cause any rot or any other damage to the timber.
![](https://bertsch-holzbau.eu/wp-content/uploads/2024/03/14422_1_wood_features-08.png)
Bleeding knots
With solid white colour paint, yellow or brownish spots (caused by timber acid) can occur. Even after sealing the knots with high-quality primer and paint, this cannot be prevented.