Thickness and dimensions of plywood sheet: prices, varieties and applications
Along with the novelties that have appeared in stores in recent years, there is a certain list of building materials that are more familiar to the domestic buyer. Such materials include plywood, its pros and cons are well known to the consumer, but this does not make it lose its popularity. The main parameters when choosing are the thickness and dimensions of the plywood sheet: its prices also depend on these characteristics.
What is a sheet of plywood: production features
A plywood sheet is a slab glued together from 3-5 layers of wood veneer. It is produced from different types of wood — deciduous (birch, alder, oak) and coniferous (pine). Birch plywood is considered to be of the highest quality and, accordingly, expensive, and coniferous wood is the cheapest. To reduce the cost of the final product, different types of wood are often combined. For example, hardwood veneer is used for the inner layers of plywood, and coniferous — for the outer. This is done not only in order to save money. The outer layer of cedar veneer is used to give the plywood sheet a beautiful pattern.
In the manufacture of plywood from the trunk of a tree, special machines by spiral sawing remove thin sheets (veneer). These sheets are stacked on top of each other (most often across the fibers to give the material greater strength), and then pressed into monolithic blocks under high pressure. Many types of wood do not need special adhesive impregnations. However, often special natural or synthetic compounds are used to improve the characteristics.
In accordance with GOST, there are 4 grades of plywood. The presence of minimal defects is allowed on the plywood sheets of the first grade. On the plywood of the second grade, there may be areas that have been repaired, cracks, glue seepage. The third grade assumes the presence of knots on the surface, wormholes, but the total number of defects should not exceed 9. Plywood of the fourth grade is of very poor quality and has a large number of defects (fused knots, a large number of wormholes, uneven edge). It is used mainly for the manufacture of containers.
Interesting fact! The production of glued plywood was put on an industrial basis at the end of the 19th century, and the method by which a sheet of plywood was glued together from several layers of veneer was called Russian, because it was in Russia that the method of obtaining peeled plywood and a machine for its implementation was invented.
The main types of plywood presented on the domestic market
There are several main types of plywood. All of them are different in their features and areas of application. The size of the plywood sheet and its thickness also differ. All these characteristics determine how much a sheet of plywood costs:
- FC plywood (moisture-resistant plywood.) The advantage of this type of plywood is environmental friendliness. In its production, adhesive compositions based on carbamide, a natural chemical compound, are used, which makes it possible to use this material even in the decoration of residential premises, in the manufacture of furniture and containers, in the automotive industry. This plywood is durable and easy to process. Its serious disadvantage is the average water resistance. FC plywood is available in polished and non-polished form;
- FSF plywood (plywood of increased water resistance). This type is characterized by a high level of moisture resistance, which is associated with the method of its production, during which an adhesive based on formaldehyde resins is used. This explains both the good wear resistance of plywood and the mechanical strength. It retains its shape well and is widely used in construction, including roofing, suitable for painting, cladding, easy to process, whether cutting or drilling. However, this type of plywood has a significant drawback — it is not environmentally friendly. During operation, formaldehyde resins, which give it such strength and water resistance, begin to emit vapors and can cause irreparable harm to health. Despite this, FSF plywood is very popular among domestic consumers;
- FOF plywood (laminated plywood). A special method of processing plywood sheets can significantly increase its moisture resistance. Laminated plywood is characterized by high mechanical strength, wear resistance, holds its shape and is suitable for painting and cladding. The disadvantage of plywood, as in the case of FSF plywood, is its non-environmental friendliness due to the presence of formaldehyde resins in the composition;
- plywood FBS or FBV (bakelite plywood, delta wood) is a very special product on the building materials market. This type of plywood is characterized by increased wear resistance, fire resistance (when gorenje it does not ignite, but charred), resistance to moisture and sudden temperature changes. In terms of its strength, it approaches low-alloy steel. It is produced from pine or birch veneer impregnated with special alcohol- or water-soluble resins (the abbreviations FBS and FBV, respectively, indicate which impregnation was used). Its service life is 10-15 years. The disadvantage of this type of plywood is its high cost, therefore, as a rule, it is used in professional construction, for example, for formwork panels during the construction of monolithic buildings. The dimensions of the FBS and FBW plywood sheet are standard and do not differ in a wide variety: 5700×1250 mm and 2850×1250 mm.
It’s interesting! Bakelite plywood can be used even in seawater and in tropical conditions, it can withstand temperature changes from -50 to +50 degrees Celsius.
Thickness and dimensions of plywood sheet: prices for different types
There are several basic sizes of plywood sheets:
- 1220×2440 mm;
- 2440×1220 mm;
- 1525×1525 mm;
- 1500×3000 mm;
- 3000×1500 mm;
- 1525×3050 mm;
- 3050×1525 mm.
Useful advice! Depending on how the fibers are arranged (along or across the front layer), longitudinal and transverse plywood are distinguished. You can determine this by marking. If we are talking about the second type, then when specifying the size of the plywood sheet, the width will be put in the first place (for example, 1525 × 3050 mm).
According to GOST, the standard length of the plywood sheet is 2440 mm, and the width is 1220 mm. Nevertheless, one of the most common formats is 1525×1525 mm.
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The thickness of the plywood is determined by the thickness of the veneer and the number of layers. Today, there is no single standard, and the thickness of the sheet varies significantly from one manufacturer to another. The minimum thickness of plywood presented in stores is 1.6 cm, the maximum is 7.6 cm.
The price of a sheet of plywood depends on many factors: the type of plywood used in the production of wood, the manufacturer, the grade of material, size, thickness.
The wholesale price for a sheet of moisture-resistant plywood 10 mm ranges from 309 to 560 rubles (the price for a sheet of plywood 10 mm 1525 × 1525 mm). With a plywood sheet size of 12 mm, its cost will be from 371 to 505 rubles. The wholesale price for a sheet of plywood 18 mm 1525 ×1525 mm is on average from 536 to 1182 rubles.
Laminated plywood has a sheet size and price slightly different from the previous types. So, with a thickness of 18 mm, the price per sheet is approximately 1580 rubles, in 21 mm — 1845 rubles. Plywood sheet sizes of 10 mm, 12 mm and 15 mm are also common.
The price of different types of plywood may vary depending on the region.