Edged Boards Of 2 Grades: Description And Characteristics Of Boards Of The Second Grade. What It Is? What Do Coniferous And Other Boards Look Like?

2024 Author: Beatrice Philips | [email protected]. Last modified: 2023-12-16 05:33

In construction and finishing works, the choice of lumber is of particular importance. From this article you will learn what a 2 grade edged board means - its description, what it looks like, what characteristics it has, where it is used, and what to look for when choosing.

What it is?

Edged boards of the 2nd grade - lumber, which is subject to almost the same requirements as for boards of the first grade. The discrepancies between them are small . These are high-strength boards that have been cut on machines with excellent thermal insulation characteristics.

They are affordable, environmentally friendly and safe . They are characterized by simplicity of processing, storage and transportation. They are classified as universal type lumber. Thanks to this, they are distinguished by a wide range of applications.

Edged boards differ from unedged material by the absence of bark at the edges or by a minimum amount of wane.

The raw materials for their manufacture are deciduous (oak, ash) and coniferous trees (spruce, pine, fir, cedar).

Main characteristics

Lumber can have different sizes, density, aesthetics. Edged board of the second grade is 25, 40 50 mm in thickness and 100, 150 mm in width, length - 3, 4, 6 m.

If the parameters of the material are different, it is classified as substandard, and therefore sold at a lower price.

It is easily processed on woodworking machines with hand and power tools . The roughness parameters of such a material are 1250 microns. The price of an edged board depends on the length and thickness.

For example, sawn timber with parameters 25x100x6000 mm, 25x150x6000 mm is on sale at a price of 3800-4200 rubles per 1 m3. The cost of blanks with dimensions of 25x (100-200) x2000 mm is from 2700 rubles per 1 m3 . If the boards are 1 m longer, it is even higher.

In terms of thickness, thicker boards are more expensive . For example, a material with parameters 50x (150-200) mm 2 m long will cost approximately 4500 rubles per 1 m3. If the raw material is bought from the manufacturer, you can order material with other parameters (for example, 30 by 50 mm in different lengths convenient for the customer).

In addition to length, among other technical characteristics, the strength indicator of a particular wood is important.

So, larch is especially hard, resistant to moisture and decay. Such raw materials are suitable for construction and cladding of building facades. Pine, on the other hand, is softer and easier to process.

The yew tree has an attractive structure, the spruce stands out for its affordable price . In addition, coniferous wood is resistant to parasites. After processing, it is not afraid of temperature changes and repels water well.

In addition, it is necessary to take into account the high impact strength of conifers.

Overview of the flaws

Edged board of the 2nd grade must obey the standards of GOST 24454-80 and GOST 8486-86. According to the requirements, it is allowed to have:

• shallow cracks up to 1/6 of the board length;
• 3 partially fused, non-fused knots;
• end cracks on one side up to 1/6 of the workpiece length;
• tilt of fibers, roll, core and pockets (up to 4);
• longitudinal warpage up to 0.1% of the total length;
• lateral warpage up to 0.5% of the length of the workpiece;
• two small wormholes per 1 m of the board;
• bevel cut up to 5% of the width and thickness.

The permissible moisture content of high-quality second-grade sawn timber, not subject to drying, is 18-22%. The presence of:

• through cracks, mold, sapwood and rot;
• inclusion of foreign bodies;
• sharp wane (over the entire width of the edge).

Selection Tips

When choosing lumber of the second grade, it is necessary to take into account a number of nuances. For example, it is important to understand for what specific purposes the boards are purchased. Other sellers can slip products of inferior quality under the guise of universal material. To take a good product, you need to familiarize yourself with the values of permissible standards and technical requirements for structures even before buying.

It is worth considering: the more flaws the boards have, the lower their grade and worse operational properties.

Defects reduce the load-bearing properties of finished products. This is especially important when buying lumber for the construction of frames, rafter systems, beams.

The determining factor may be the price: grade 2 edged material is 25-35% cheaper than the first-grade analogue . If the price is too low, you should think about the quality of the boards. Low-grade material has such defects as high humidity, insect infestation. It is sometimes made from a burnt forest using trees that have survived forest fires.

In order for the finished product from the purchased board to be durable and practical, before ordering the material, you need to pay attention to the curvature and the level of wane.

The obsol will have to be removed, regardless of the type of planned work . Otherwise, it will cause the destruction of the wood. The bark will sooner or later fall off the tree, and bugs will start up under it, spoiling the material.

You need to take boards of the same length without obvious curvature.

It will cause the formation of large gaps during the cladding, which is unacceptable during the cladding work. In terms of length, different formats increase the amount of waste.

Where are they used?

Edged boards of 2 grades are used in domestic and industrial construction. They equip the formwork, create:

• rough floors and ceilings;
• insulated roofs;
• temporary buildings;
• shields, protective structures (fences);
• containers, pallets, rivets for barrels.

Due to their high aesthetic properties, they are also used for interior decoration (plating baths, dressing rooms, attics, winter and summer pavilions, verandas, winter gardens, awnings, glazed balconies, loggias).

In addition, it is bought for the manufacture of service-type buildings (garages, change houses, sheds, greenhouses).

Edged boards are taken for the construction of stairs, lathing . With their help, decorative elements of the interior are created (for example, arched structures, partitions). It is used to produce inexpensive wooden furniture (tables, chairs, stools, benches, dressers, wardrobes, shelves), and also make wooden parts for bodies.