osb material. Moisture resistant OSB plywood: description, characteristics, dimensions and reviews
Recycling waste from the woodworking industry is not new for a long time. They are used to make plywood, chipboard, fiberboard, glued laminated timber, which are actively used in the furniture industry. OSB particle boards have gained recognition relatively recently, and now we will describe the characteristics of this product, its varieties, as well as the areas in which it is used.
OSB boards: types and methods of application
Currently, there are four varieties of OSB oriented strand boards. These include OSB1, OSB2, 3 and 4. They all have different specifications, which implies a variety of areas of their application.
OSB1 are plates that are characterized by a low density of the material. As a result, they cannot endure contact with moisture without serious damage. They are mainly used in the furniture industry.
OSB2 - have greater, in comparison with the first type, strength and density. The common pair of the first two types is moisture intolerance. Due to the increased density of these boards, they are used for sheathing structures in rooms with average humidity values.
OSB3 - has become the most widespread today. It is characterized by high strength and resistance to use in environments with high humidity. True, with prolonged contact with water, it still begins to deform. To use this material outdoors, it must first be treated with paint or an appropriate impregnation.
OSB4 - already a level higher than the previous ones. It is extremely durable and does not suffer damage from water even when used for a long time in an environment with high humidity. This material has only one drawback - its price. It is about twice the price of OSB3.
OSB (OSB) plate - characteristics size and weight
Another criterion for separating oriented strand boards is their thickness. This is one of the most important characteristics of OSB boards. After all, this is also not an insignificant factor in the choice of materials in certain areas. Length and width (2500x1250 mm) remain standard in OSB (OSB) sheets, but the thickness ranges from 8 to 26 mm, in steps of 2 millimeters.
Slab dimensions
For sheathing structures in which a high load on the slab is not foreseen, for example, thin sheets up to 16 mm thick are used. With their help, they make walls, create a base for soft roof, they sheathe walls and existing wooden floors. In cases where a load is provided, measured in hundreds of kilograms per square meter, thicker plates are used. Basically it is, if necessary, to create a basis for the installation of heavy equipment, as well as flooring and for roof structures.
Table of strength and moisture resistance
Technical characteristics of OSB boards (OSB)
Modern OSB boards can boast quite high rates. This is what made them such a common building material.
Here is a list of the main properties of oriented strand board:
- Relatively high strength. They can withstand a weight of several centners, the main thing is to choose the required thickness;
- Lightness and elasticity. Thanks to these two characteristics, OSB can be used when sheathing various curved surfaces that have a significant radius of curvature;
- Structural homogeneity is a property that ensures the preservation of the integrity of the plate during bending. This gives OSB an advantage over plywood, which will delaminate in such cases;
- The advantage of OSB over wood is that it is devoid of shape instability with excessive moisture, and the risks of defects on OSB, in comparison with wood, are much less;
- Oriented strand board is very easy to process with tools such as a drill, saw. This greatly facilitates the work when connecting sheets to each other;
- Relative to other materials, OSB has very high rates of heat and sound insulation;
- Resistance to chemical and mechanical stress is another plus of this material;
- Special impregnation prevents the formation of mold and fungus on the plates.
Table of physical and mechanical properties
| Indicators | Mill- dart |
Aggloply OSB 2 |
Aggloply OSB 3 |
OSB 2 | OSB 3 | ||||
|---|---|---|---|---|---|---|---|---|---|
| Thickness, mm | 10-18 | 10-18 | 6-10 | 10-18 | 18-25 | 6-10 | |||
| Thickness tolerance, mm: slab unpolished polished plate |
EN 324-1 | 0,3 0,3 |
0,3 0,3 |
±0.8 ±0.3 |
±0.8 ±0.3 |
||||
| Length tolerance, mm | EN 324-1 | 3 | 3 | 3 | 3 | ||||
| Width tolerance, mm | EN 324-1 | 3 | 3 | 3 | 3 | ||||
| Squareness, mm | EN 324-2 | 1,5 | 1,5 | 1,5 | 1,5 | ||||
| Straightness, mm/1 m | EN 324-1 | 2 | 2 | 2 | 2 | ||||
| Modulus of elasticity, N/mm²: longitudinal axis transverse axis |
EN 310 | >6000 >2500 |
>6000 >2500 |
3500 1400 |
3500 1400 |
||||
| Bending strength, N/mm²: longitudinal axis transverse axis |
EN 310 | >35 >17 |
>35 >17 |
22 11 |
20 10 |
18 9 |
22 11 |
||
| Cross tension, N/mm² | EN 310 | >0,75 | >0,75 | 0,34 | 0,32 | 0,3 | 0,34 | ||
| Formaldehydes, mg/100g | EN 120 | <6,5 | <6,5 | <8 | <8 | ||||
| Swelling in 24 hours when completely immersed in water,% | EN 317 | 12 | 6 | 20 | 15 | ||||
Work with OSB (OSB) plates and their application
OSB boards can be used in many areas of construction due to their technical characteristics. Primarily, this building material is used to arrange the walls of frame buildings and to create partitions between rooms. Also, with the help of oriented strand boards, the installation of flooring is carried out and the floors are leveled, which were installed earlier. In addition, OSB act as an excellent base for certain types of roofing materials.
OSB, regardless of their area of application, have an almost identical method of attachment. They are simply fixed with self-tapping screws on a metal or wooden frame.
In the case when you need to install the flooring using OSB, the plates are attached to the logs, which must be pre-installed. A wooden crate can serve as a supporting structure in the manufacture of a roof. For wall cladding with OSB slabs, special metal profiles must first be installed on the wall, and the slabs themselves are already mounted on them. To guarantee the inviolability of the structure, the step when installing profiles, lags or battens should not exceed 400 millimeters.
As mentioned above in this article, OSB boards are very easy to process according to your desire. Their processing is possible even when using an ordinary hacksaw, but this will take you a lot of time and effort, so we advise you to use an electric jigsaw. It should be equipped with a large-toothed wood file, so you will speed up the process of cutting the slab as much as possible.
Well, the obvious fact is that OSB boards are simply indispensable for builders. With their help, you can build a full-fledged frame house, including interior work - installation of the floor and walls. Such dwellings are built as quickly as possible and have a very long service life.
Video
During the period of the repair and construction boom, modern technologies and materials enjoy increased attention. So, oriented strand board (OSB) is of great interest, in the English version - OSB (oriented strand board).
It is a multilayer sheet, which consists of more than 90% wood chips. Resins with impurities of boric acid and synthetic wax are used as glue. OSB is an almost universal board
How they are made
For the production of OSB, small-sized softwood is needed. Large chips and chips are glued together with various resins at high temperatures. By the way, OSB is visually easy to distinguish from other building materials precisely because of the large and long chips, which are strictly oriented in different parts of the plate. In the outer layers, it is located longitudinally, and inside the plate - transversely.
The high quality of such a compound is provided by synthetic wax, and ideal protective characteristics are provided by boric acid salts. There are no defects in OSB boards that are typical for wood products: voids, air pockets from knots, etc. Everything is strong and reliable here.
Classes according to STB EN 300
In accordance with the requirements of STB EN 300, there are four classes of OSB boards:OSB-1- general purpose boards used in furniture production when operating in dry conditions (non-moisture resistant boards);
OSB-2- general-purpose boards used in load-bearing panels under temperature and humidity conditions corresponding to service class 1, established in EN 1995-1-1 TKP. Increased mechanical strength and low moisture resistance;
OSB-3- slabs of load-bearing frame panels for a humid environment under temperature and humidity conditions corresponding to service classes 1 and 2, established in EN 1995-1-1 TKP. High mechanical strength and resistance to moisture;
OSB-4- slabs of load-bearing frame panels for harsh operating conditions under temperature and humidity conditions corresponding to operating classes 1 and 2, established in EN 1995-1-1 TKP.
Moisture resistance and moisture permeability of OSB boards
Yesterday and today
The first OSB board was made more than thirty years ago in Canada, and then began to be produced in the Soviet Union. A workshop was built at one of the Belarusian enterprises, which launched the serial production of oriented strand boards.
Today, the main production facilities for the production of OSB are located in Canada and the USA. Among European exporters, Austria, Germany and Latvia are considered the largest.
Plates are also produced in the Celestial Empire. However, the quality of Chinese OSB is significantly inferior to both American and European samples. The reason is that the Chinese use poplar for the production of plates, which is inferior to conifers in its characteristics.
In recent years, the production of OSB in Russia has been established.
A special line was put into operation at the Novovyatsky Ski Plant in Kirov, where OSB boards have been produced since October 2012. In June 2013, the first large plant in Russia for the production of OSB boards at the DOK Kalevala was officially opened. After the commissioning of the second stage, the plant's capacity increased to 600 thousand m 3 of products per year.
For numerous Russian consumers, such facts inspire optimism, since domestic products are cheaper, and in terms of quality they are practically not inferior to well-known brands. Among those that are popular today in Russia: Georgia Pacific, Glunz, Ainsworth, LP, Kronospan and others.
Resins and end product quality
Resins play an important role in the manufacturing process of OSB boards. The quality of the final product depends on how correctly the resin brand is selected and inscribed in the technology.
Various types of resins are used for the outer and inner layers of the board. Their concentration is from 11 to 15% of the total mass.
One of the serious problems is the high toxicity of resins. Unfortunately, they release into the atmosphere such harmful components as formaldehyde, methanol, phenol.
The main dimensions of the osb sheet
As a rule, OSB board consists of three or four layers, two of which are external. Modern technologies allow the production of slabs of almost any size, but in practice the following standards are mainly applied:
OSB VS Chipboard
OSB boards were created primarily to compete with chipboard (chipboard) as a more modern and high-quality product. And this was achieved. OSB has physical and mechanical characteristics almost three times higher than those of chipboard structures.
Table of evaluation characteristics of wood-based panels
| Characteristics | OSB Hardwood plywood Softwood plywood MDF Chipboard|||||
|---|---|---|---|---|---|
| Appearance (decorative qualities) | 5 | 3 | 3 | 3 | 3 |
| Elasticity indicators | 5 | 4 | 4 | 2 | 2 |
| Bending strength | 4 | 4 | 4 | 2 | 1 |
| Recommendations for outdoor use | 4 | 2 | 3 | 1 | 1 |
| Dimensional stability (length, width, sheet thickness) | 5 | 3,5 | 3,5 | 2 | 2 |
| Medium? weight 1 m3 | 3 | 3 | 4 | 2 | 1 |
| Fastening with nails (force depending on the density of the wood) | 3 | 4 | 4 | 2 | 4 |
| Screw fastening strength | 5 | 3 | 3 | 3 | 3 |
| Ease of handling with hand and power tools | 5 | 4 | 3 | 3 | 4 |
| The presence of external and internal defects (stratification, knots, voids) | 5 | 3,5 | 3,5 | 5 | 5 |
| Can be used for painting (lacquer, plaster) - with pre-treatment | 3 | 4 | 4 | 4 | 4 |
Pros and cons
Among others positive properties of OSB relate:
The uniformity of the structure and its high strength.
Moisture resistance, due to which the oriented strand board does not lose its properties, even being in water for a day.
OSB boards are very easy to process, glue and paint.
They hold screws and nails securely.
Various defects (voids, delaminations, knots) practically do not occur.
OSB boards cannot be spoiled by insects.
The undoubted advantages of this material include a low price, an attractive “wood-like” appearance, and a relatively low weight of the plate. This is especially important when working at height: you can do without cranes, blocks and scaffolding.
There are few drawbacks to OSB boards, although there is one significant one that has already been mentioned - the high content of formaldehyde and other toxic materials in some brands of products. For this reason, the Ministry of Health of the USSR at one time banned the production of plates on the territory of the state. But this is already a fact of history.
Mechanical properties according to EN 300
| Characteristics | Method tests | Thickness plates, mm | OSB-1 | OSB-2 | OSB-3 | OSB-4 |
|---|---|---|---|---|---|---|
| Bending strength - main axis, N / mm 2 | EN 310 | 6 to 1020 | 22 | 22 | 30 | |
| 18 | 20 | 20 | 28 | |||
| 16 | 18 | 18 | 26 | Bending strength - lateral axis, N / mm 2 | EN 310 | 6 to 1010 | 11 | 11 | 16 | > 10 and< 189 | 10 | 10 | 15 | 18 to 258 | 9 | 9 | 14 |
| Modulus of elasticity - main axis, N / mm 2 | EN 310 | 6 to 102500 | 3500 | 3500 | 4800 | |
| Modulus of elasticity - lateral axis, N / mm 2 | EN 310 | 6 to 101200 | 1400 | 1400 | 1900 | > 10 and< 18 18 до 25|
| Tensile strength perpendicular to the plate plane, N/mm 2 |
EN 319 | 6 to 100,30 | 0,34 | 0,34 | 0,50 | |
| 0,28 | 0,32 | 0,32 | 0,45 | 0,26 | 0,30 | 0,30 | 0,40 |
Scope of application of the material
Due to their universal properties, OSB boards are widely used in construction.
1. Wall cladding. OSB can be successfully combined with other facing materials, creating beautiful compositions.
2. Removable formwork for concreting. The strength of the plate allows it to be used repeatedly even in rough construction work.
3. Full roof sheathing. OSB is often used as a basis for roofing materials (tiles, slates, etc.). Here, the important factors are the high sound insulation of the slab, its rigidity, the ability to withstand high natural loads: wind, rain, snow, sharp drops temperatures.
4. Draft floor - as the main flooring and log.
5. Single-layer floor in lightweight building structures.
6. Double beams. AT wooden houses they serve as a support between floors and walls.
7. SIP panels are made from OSB boards, which consist of two outer layers of oriented strand board and an inner layer of expanded polystyrene.
8. You can use the plate as a rigid base for the manufacture of thermal panels.
9. OSB is an excellent material for high-quality packaging: containers, boxes, boxes and other containers.
Waste from the woodworking industry is now used to produce various kinds of building materials.
The long-known chipboard, plywood, glued laminated timber are very popular.
As well as OSB boards, which began to be used in the construction of frame houses, the construction of roofs, formwork structures and apartment renovations.
Types of OSB and their differences
There are 4 types of oriented strand boards on the market. Below is Comparative characteristics materials
| Variety | Characteristic |
|---|---|
| OSB-1 | Material of low moisture resistance and density. Used for interior work and in the manufacture of furniture |
| OSB-2 | A plate with a high level of strength, but low moisture resistance. Suitable for the construction of internal partitions, floors and load-bearing structures. |
| OSB-3 | Material with high strength and moisture resistance. Suitable for outdoor work. |
| OSB-4 | Super strong and moisture resistant. Used for external load-bearing structures. |
Manufacturers also offer plates of different sizes and thicknesses so that the consumer can choose the appropriate option for the planned scope of work. The price of OSB boards is formed based on the characteristics and purpose. The most expensive are OSB - 4, and the most popular among buyers - OSB - 3.
The use of OSB boards
The use of OSB boards, due to its technical characteristics, is quite wide. It is used for:
- surface leveling;
- erection of partitions in the room;
- installation of house frames;
- roof and truss structures;
- creating furniture;
- production of SIP panels;
- installation of racks and stands;
- sheathing of wooden stairs.
OSB boards for outdoor use, the characteristics of which fully meet the requirements of builders, are easy to install and resistant to any weather conditions. Experts recommend additionally treating the material with an anti-corrosion, heat-resistant and moisture-resistant coating to increase wear resistance parameters. An example of the installation of outdoor structures made of OSB is shown in the video.
In interior work, for example, when installing partitions or leveling floors and walls, before finishing, the boards should be additionally sanded and prepared for painting or laying other material (boards, drywall, parquet boards, etc.). The photo shows the stages of installation of internal partitions from OSB.
Characteristics of OSB boards (video)
Specifications OSB
The material appeared on the market about 30 years ago. It was developed in the West for use in the construction of frame houses. The technology for creating plates is simple: elongated chips of trees such as pine or aspen are pressed and impregnated with special moisture-resistant oils and resins. Thanks to innovative technologies, OSB has a high density, does not delaminate, does not have chips or voids. OSB plate specifications:
- Structural homogeneity allows the material to be bent without damaging its integrity.
- High strength allows the use of plates in construction.
- OSB has high rates of heat and sound insulation.
- Special means used for impregnation prevent the appearance of fungus and mold.
- High moisture resistance.
- OSB is easy to process and can be painted and glued without damaging the structure.
- High holding capacity allows you to securely fasten hinged structures.
- Resistance to mechanical and chemical damage.
Advantages of OSB
One of significant features slabs is durability. With proper installation, structures made of material will last for decades. According to their characteristics, they are similar to wood in lightness and strength, but at the same time they are moisture resistant, resistant to mold and decay, and lack voids and irregularities on the surface.
Easy installation is ensured by the ease of assembly, processing and dimensions of the plates. The minimum number of joints when laying the material makes the surface more even and prepared for subsequent work. Light weight simplifies the work with the plates and allows them to be used in the installation of roofs.
OSB damage
The safety of materials used in construction remains a key factor in their selection. Today, OSB manufacturers assure buyers that materials are in full compliance with consumption standards. However, expert commissions remind about the harmful use of formaldehyde in the production of the material. How to determine the harmfulness of OSB boards by technical characteristics In order to protect the house from the toxic effects of fumes, you need to know about OSB classification by emission level:
- E2 - 10-30 mg/100 g of dry material;
- E1 - up to 10 g / 100 g;
- E0 - emission range within 2-5 g / 100 g.
So, for use in outdoor structures, a slab with E2 emission is suitable, and for residential premises, for safety reasons, it is necessary to choose class E1 and E0.
Before buying OSB on your own, you should seek the advice of professionals. Builders will help you choose the option that is necessary in terms of parameters and properties for the needs of the consumer at a bargain price, and of the appropriate quality.
Photo gallery of finished works
Approximate particle boards are obtained by pressing wood chips mixed with an adhesive mass. They are multilayer, depending on the features and characteristics, are used in various construction areas.
The OSB sheet can be standard or made to order with the specified parameters. When choosing this material, it is necessary to take into account its properties and purpose.
In contact with
Description
Wood chips or shavings are used as a basis in the manufacture, which are pressed at high temperatures and pressure, mixed with resins, synthetic wax, and other adhesive materials. Products consist of several layers, and in each of them the pressed chips have their own direction. In the outer it has a longitudinal orientation, and in the inner it has a transverse orientation.
OSB boards are produced during such technological stages:
- sorting and drying. After grinding into chips of a given size on special equipment, the wood is transferred to the drying chambers. Then sorted by size;
- mixing with adhesives, which gives the plate more rigidity, strength, moisture resistance;
- styling. In a special station, the resulting mixture is laid in a certain direction;
- pressing. The press compacts the laid material by raising the temperature and exerting a certain pressure on it.
Having passed all these stages, OSB boards are cut into sheets of a certain size, packaged and checked for geometric conformity to the shape. For final hardening, they are kept in the warehouse for some time.
Advantages
To material advantages may include the following:
- durability and strength;
- ease of processing;
- structure homogeneity;
- resistance to moisture and temperature extremes;
- resistance to the formation of mold, fungus, not susceptibility to decay;
- high rates of sound insulation and thermal insulation;
- elasticity;
- practically waste-free use;
- affordable cost;
- light weight.
The main disadvantage is toxicity. Phenol, which is part of synthetic resins, does not have a very positive effect on human health, releasing harmful substances into the air.
Important! Some manufacturers, in order to make the material environmentally friendly and safe, have begun to use formaldehyde-free polymer resins for gluing. This point should be clarified when buying.
Prices for OSB sheets
OSB sheets
Dimensions, classification, characteristics
Standard sizes OSB boards, which are most often found in stores:
Main performance characteristics:
- Easy to process: cut, sawn, sanded, planed, mounted and drilled.
- fireproof properties. Refers to fire-resistant materials.
- Strength. Able to withstand significant loads, installation of fasteners: nails, screws, self-tapping screws. Due to the high density, the products hold well, and during drilling they do not form cracks and chips;
- Moisture resistance. The plate is used in rooms with high humidity, withstands temperature extremes, therefore it is used for external cladding of buildings and structures.
In addition, the material is versatile in external processing. It can be glued with any wood glue, and for external processing it is permissible to use paints and varnishes, putty and other facing materials.
Classification
Classify the material by thickness, scope, degree of moisture resistance, strength, method of external processing. The thickness varies, the sheets are thin, medium and thick.
The surface can be:
- unpolished with a rough surface;
- polished, smooth, machined;
- varnished, covered with pasty, liquid varnish;
- laminated, when paper impregnated with adhesives is applied to the surface.
The edge of the sheet is even, has a connecting groove-comb, which allows you to tightly, hermetically connect products to each other, speeds up the work process, makes it easier and faster.
The size of the OSB sheet can be standard and non-standard, indicators of moisture and strength may have the following ratio:
- low strength and moisture resistance, OSB-1;
- high strength and low moisture resistance, OSB-2;
- high moisture resistance and strength, OSB-3;
- ultra-high strength and increased moisture resistance, OSB-4.
The characteristics or indicators of moisture resistance depend on the composition of the adhesive used when bonding the chips, and the number of layers affects the strength. There can be from 3 to 4. The more there are, the stronger the material.
Important! When choosing, it is better to give preference to sheets that have large dimensions, since their width and thickness affect the number of joints, which will subsequently affect the quality and strength of the surface to be coated.
Them price will also be different, it depends on the manufacturer, the filler used, that is, what kind of wood the chips are obtained from, the type, composition of the connecting substances, size, weight, area of the product.
Where applicable
Different sizes of OSB sheet applied in the following areas:
- construction ;
- installation of formwork, creation of a subfloor;
- erection of a frame, billboards;
- production of boxes, packaging, stands, counters, ;
- serve as a substitute for lumber;
- go to the lining of the floor, walls, ceilings;
- can serve to cover the opening of a temporary type.
Often this material is used for upholstery of the interior of ships, trucks, trains. The largest number of plates with a thickness of 9 mm or 12 mm is consumed during the construction of external, internal walls, partitions.
You can mount them in a horizontal or vertical position. On the floor, they are laid perpendicular to the lags that serve as the basis. In this case, thick sheets are used - from 18 mm to 22 mm wide.
Moisture-resistant rough chip sheets go to the continuous roof sheathing. Slate, metal tiles and other roofing, roll materials are mounted on them. They are also used in the construction of temporary fences, fences, protective structures.
Important! It is necessary to use in the arrangement of premises and for exterior decoration those sheets that meet the required characteristics.
Products there are three classes. The first is used for interior work in dry rooms. The second class can be used in a humid environment, after pre-treating the plates with a protective coating. The third class withstands adverse conditions: high humidity, repeated moistening and drying.
Nuances of choice
The size of the plate, namely the thickness, width, length, affects its purpose and scope of use, because this is the main criterion that you should pay attention to when choosing. The size of the OSB sheet of 9 mm is the most popular, and 12 mm is not inferior to it. They are used in the arrangement of the subfloor, structures that are not subjected to heavy loads, as a packaging material. Internal partitions are constructed from 12mm sheets, dividing the space into separate zones, rooms, or with their help they make a solid base for laying roofing materials.
Useful video: OSB material characteristics
This multilayer slab material is universal, the presence of several varieties, moisture-resistant structure, allow the use of sheets for various construction and industrial purposes. It speeds up the workflow and reduces costs. The main thing is to make the right choice, taking into account the characteristics, using products exactly in the area for which they are intended.
What are OSB sheets and what are they made of? OSB or OSB sheet is an oriented strand board, which is a wood chip material glued with a special polymer. Many mistakenly assume that chipboard and OSB are about the same thing. However, OSB sheets are made only from high-quality chips, which are placed in a special way perpendicular to each other. The sheet itself is formed using synthetic resins, under high temperature and pressure. Due to its robust structure, the material is very durable.
Characteristics of OSB board
The general technical characteristics of chip sheets are as follows:
— Density of plates can vary from 640 to 700 kg/m3;
- the fire hazard of the material is increased - G4, it is usually treated with fire retardant solutions;
- the adhesion and coloring of the sheets is good, they are often covered with various varnishes;
— the manufacturability of the material is practical, it can be sawn, drilled, nailed, ground and cut; fairly simple installation;
- the holding mechanical ability does not have an exact number, but is considered high;
- swelling coefficient - 10-22%.
Where OSB sheets are used
OSB sheets are widely used in the following areas:
— as a material for shelving and stands;
- cladding stairs made of wood;
- sheathing of the walls of houses from the frame;
- in the form of SIP panels;
— as the basis under a tile for a roof;
- in panel formwork structures;
- for filing ceilings;
- as a basis for installing floors.
Building a house from OSB sheets using frame technology.
OSB sheets are widely used in the construction of houses using frame technology. One of them can be found in the article:.
OSB board classes
There are several classifications of OSB sheets. First consider the class, denoted by numbering from one to four. So let's figure out what the numbers mean after the very name of the material.
1. OSB-1 is the material with the lowest strength and lowest water resistance. It is used in rooms and structures without heavy loads (in the form of sheathing and furniture elements).
2. OSB-2 is used for the construction of load-bearing structures for dry rooms, respectively, the level of strength is medium, moisture resistance is low.
3. OSB-3 is a material that has higher strength and is allowed to be used in high humidity conditions.
4. OSB-4 is a durable sheet that is designed for maximum moisture levels combined with mechanical stress.
OSB-3 boards are the most widely used because of their strength characteristics. If such sheets are primed or painted, then their moisture resistance characteristics are comparable to OSB-4 boards. OSB-4 boards are not widely used because of their high cost, it is about two times higher than that of OSB-3 boards.
Health hazards of OSB boards
Each chipboard has in its composition another not very useful, or rather, completely harmful component. It is the glue that connects the entire OSB structure into a single whole - formaldehyde. However, in a bound state, it is absolutely safe, but there is one moment that destroys this myth. During the manufacture of the plate, it is compressed, so the structure of the adhesive collapses and during the operation of the sheet, a certain level of toxins is released into the room. The toxicity class is designated as follows:
- E0.5 - formaldehyde emission no more than 0.08 mg / m³ of air;
- E1 - formaldehyde emission from 0.08 to 0.124 mg / m³ of air;
- E2 - formaldehyde emission from 0.124 to 1.25 mg / m³ of air.
For the installation of OSB boards indoors, it is better to use boards with toxicity classes E0.5 and E1. Such plates are also harmless to health like other building materials.
Dimensions and thickness of OSB sheets
The possible dimensions of the OSB board directly depend on the edges of the building material itself. They can be (below are the possible sizes):
A. With smooth edges. In this case, the dimensions of the sheet are:
- 2440x1220 mm;
- 2500x1250 mm;
- 2800x1250 mm;
- 3125x2000 mm.
B. With grooved edge. Such a class includes dimensions in:
- 2440x1220 mm;
- 2440x590 mm;
- 2450x590 mm;
- 2500x1250 mm.
The thickness of each OSB sheet can vary from six to twenty-two millimeters. Here is a range of typical thicknesses: 6, 8, 9, 10, 12, 15, 18, 22mm
On the edges of the OSB sheets, there may be special grooves for the best connection between them. Prices for OSB sheets.
Almost all residents of large and not very cities are well aware that in our time it is relatively easy to buy a fake certificate proving clean environmental friendliness and safety of products. Therefore, in order not to get into trouble, it is better to trust only the most famous and popular OSB manufacturers. These include:
- Kronospan-Bolderaj, OSB-3, for example, a plate with a size of 2500 * 1250 mm and a thickness of 9 mm will cost about 650 rubles;
- Glunz and Egger - German plates of the same size and thickness are slightly more expensive - for 850 rubles;
- Kalevala OSB-3 is a Russian plate, which can be purchased for 550 rubles.