All you need to know about boards

Creation of edged and unedged wood products directly depends on the characteristics of the strength and quality of the status of the products themselves. This parameter is used to simplify the selection of a specific type of boards for a particular work.

As defined?

Wood’s sorting includes a number of important characteristics that affect product belonging to a specific category.

  • The size. GOST sets special rates of cutting board sizes, the percentage of humidity of which does not exceed 20%. This means that in connection with the extractive material, the thickness parameters and widths are less or more.

  • Percentage of moisture. Wood material, which has a humidity indicator of 22%, as a rule, is recognized as dry. Such a degree is considered normal with respect to the first 3 varieties, as well as the selected variety of wood. The distinction of the 4th grade product is that humidity indicators are not registered.

  • Disadvantages of natural origin. This is a very important point when choosing a tree, as the presence of flaws on the product directly indicates its variety. The bitches can be completely contrived or partially. Sometimes during the fallout of the bitch that did not have grown, the hole appears to be seal. In turn, the bitch has its own classification. They are rotten, swallowed, tobacco and normal (in a healthy condition). If the tree rotates finally – it means that the bitch is tobacco. Wood material should also be checked for cavities between annual layers that are filled with resin. If there are so-called pockets in the product, their number should not exceed the established standards. The existence of flaws of tobacco and rotting types is not permissible on the product of the first grade.

  • Fungal lesions. Sometimes appear on the material itself, forming blue mushroom spots or rot. As part of the crust, they may be present in the lowest grade products, but it is undesirable.

  • Ozol. An acute view is capable of occupying the entire width of the board, and a blunt type – only partially edge width.

  • Balance. If the humidity of the edged board changes, then it starts bend. The bend can be calculated by the ratio of length and width. These norms, as a rule, can decrease by 2 times in the case when the percentage of the moisture of the edged board will be higher than 22%. If wood has a higher quality, it does not allow the presence of a roll.

  • Cracks. In the process of drying on wood, crevices, vices and breaks arise. Cracks are not considered significant if 5 millimeters do not exceed in depth. Crowdes of through-type appear from the sides or on two butters. Cracks are edged and plastics. The presence of such cracks may be within the framework of the norm. Goste cracks are also classified by the magnitude of the deepening.

Survey review

Classification includes 5 types of planed boards, including the highest class grade. Everyone has significant differences. Below are the descriptions of each of them.


This is one of the varieties of dry cutting board, which is the view of the highest quality.

It is an extra class – this is the most prestigious wood variety that can be found. Such a grade is used for any construction work.

They are separated by the inner parts of buildings and premises, used in furniture production, as well as in the construction of shipping elements, such as deck parts or yacht masts, with automotive production. The most expensive class that happens from coniferous breeds.

Maximum permissible crack size: 16% by relation to the length of the board, not more than 10% – to depth. Deflection can not be more than 1%. Find the board of this variety among the products of the internal building market is quite difficult, as it is exported abroad.

Sometimes such wood is called a raw material of zero variety. These boards without defects caused by rot, do not have through holes, the remains of the vital activity of parasites, mold elements. On the wood of this species there can be no bumping formations, faults, cracks and flaws from drying, as well as bark residues. They, as a rule, look great, perfect shape, smooth, without irregularities and roughness than and different from the rest of the varieties.

However, there are a number of reasons for which such material is practically unavailable.

  • The highest requirements are presented to the “zero” class variety. Usually it is an export material, as well as material for high-class construction objects.
  • The cost is much higher than that of other wood varieties.
  • In connection with the difference in domestic and foreign measures and scales, as well as the production of the product for exports, in Russia, there may be one or another dimensional inaccuracies in Russia.

Among the products of wood “zero” class can be found like cladding, floorboard, brusal imitation, board for deck or terrace, plaquen and others.


First-class goods are pretty popular and sold. In their composition, the minimum number of cracks, bitching formations and other flaws. Naturally, on the boards of the first grade, the minimum amount of damage from rot, mold and parasitic defects, mushroom spots, blue and other. A single number of defects are allowed.

If you know more, then the edged board can have no more than 3 large bitch per meter. In the length of a shallow species can reach about 25% of the total length of the product.

Defects caused by fungal defeat can not be more than 10% of the entire surface. The presence of rotes are unacceptable. It is allowed to a small conversion of a stupid type. Curvature at the level of extra class. Moisture at the material no more than 20-22% with an error of 3%.

The holistic state of the first class edge board does not change. Such a product is intended for frame, staircase, door, frame and assembly types of construction.


A second-rate includes products having frozen flaws. These shortcomings should not spoil product appearance. In-depth cracks, rotting and drunk education are prohibited. Bounds can be discharged, with a diameter of no more than 20 mm. Syane and mold parts take up to 20% of the surface.

The scope of products of such a variety is very and very extensive because it has the most comfortable value for money and quality ratio. From this class of wooden materials, you can build shields, work with the crate.


Third-rate lumber of lower quality compared to the rest of the varieties. Most of them make box-made products for packages, some types of containers, pallets and flooring. The only requirement that is presented to them is the absence of large bitch, fully inacted, as well as large and volumetric cracks.

In this grade of wood allowed tobacco types, mold, wormwort and through cracks. In addition to this, the third type has a rather low bearing capacity.

Editing third-rate cost-effective products can have a humidity framework that have the first and second grade. It is important that you can externally, there may be some kind of flaws, and in general there may be quite a lot. However, rotten entities should in no case should.


The cheapest class of sawn timber, which involves a large number of defects. Permissible defects: roughness, total putrefactive damage, strokes, mold. Such boards are commonly used to make containers, in rough construction work, in the production of boxes and other things. As well as they are often used to build temporary fences and fences, canopies and economic blocks.

What boards to choose?

To competently choose the desired variety of sawn timber, you can learn how to determine it with several useful tips.

  • It is necessary to take into account the presence of annual rings. In the area of ​​vertical dissection, such rings are tight with each other. In this case, the edged sawn timber will be durable and resistant to humidity. Wood better, if it grows in cold climatic conditions.
  • The edged tree should not be with the core. Such a part may be precursor fungal lesions.
  • When choosing a material, be careful: you do not need to take too dried edged boards, as well as those that contain a large amount of moisture. You need to pay attention to the conditions of storage.

    Each variety has the most preferred scope of application.

    • 1 grade – construction of frame elements, and also suitable for building significant objects. For this kind of activity it is better to use larch.
    • 2 varieties – floor coverings, as well as panel facing of surfaces.
    • 3 – structures that do not require significant loads.
    • 4 – suitable for containers, crates, fences.

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