Plywood
In forestry, plywood is the term used to describe raw wood that is not measured by the individual logs, but is sold by cubic meters .
Measurements
A distinction is made between two types of plywood, split logs and other short timber . For this purpose, it is usually cut into lengths of 1 or 2, more rarely 3 to a maximum of 7 meters, and erected in layers in so-called joints. When they are placed, these wood piles are overdimensioned by at least 3%.
The advantage of selling as plywood is that not every log has to be measured individually. This can reduce the timber harvesting costs. As a rule, plywood is an inferior range such as industrial wood or firewood .
In Germany, the statutory grading for raw wood (Forst-HKS) is usually used for sales . According to this, plywood is divided into the following classes according to the diameter with bark at the weaker end:
| class | Diameter with bark |
|
|---|---|---|
| S 1 | Round pieces | 3 to 6 cm |
| S 2 | Round pieces | 7 to 13 cm |
| S 2.1 | Round pieces | 7 to 9 cm |
| S 2.2 | Round pieces | 10 to 13 cm |
| S 3 | Round pieces and split pieces from it | 14 cm and more |
| S 3.1 | Round pieces and split pieces from it | 14 to 19 cm |
| S 3.2 | Round pieces and split pieces from it | 20 cm and more |
In the case of plywood without bark, the specified diameters are reduced by 1 cm. The division of classes S 2 and S 3 into sub-classes can be omitted.
Trading according to these guidelines is not mandatory, but serves to standardize the market. For special purposes it can be helpful to deviate from this.
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- ↑ Directive 68/89 / EEC (PDF) of the Council of January 23, 1968 on the approximation of the laws of the member states for the sorting of raw wood.
- ↑ Commercial grade sorting for raw wood (Forst-HKS) (pdf, wald-online-bw.de).