When considering how to paint OSB outside, it should be noted that the oriented particle boards(OSB or OSB - Oriented Strand Board) are a relatively new building material that has found its application in the construction of frame buildings for various purposes, installation of floors, installation of external and internal partitions, etc. The best option facade finishing buildings made of OSB is the use of traditional materials: lining, siding or clinker tiles. However, the use of OSB in private construction is very often due to a limited budget. Therefore, the most popular exterior finishing solution of this material is painting.
Selection of paint and varnish compositions for exterior finishing of OSB
During the production process, OSB is impregnated with special compounds that reduce the harmful effects on the material high humidity, temperature changes, ultraviolet radiation, chemicals, etc. This impregnation is quite sufficient for transporting and storing the slabs indoors, but after completing the installation work it is necessary to finish them.
Oriented strand boards are 90% wood. Therefore, to paint them you can use the same materials as for treating wooden surfaces. It should also be taken into account that the selected composition will be constantly under negative impact external factors.
For exterior finishing OSB can use the following paint and varnish materials:
- oil;
- alkyd;
- acrylic;
- transparent varnishes.
Oil formulations are made on the basis of drying oil. They have high viscosity and good adhesion to wood. Their service life is no more than three years. The disadvantages of oil paints include:
- toxicity;
- relatively high cost;
- long drying time (more than 24 hours);
- poor resistance to external factors - under the negative influence of high humidity and sunlight, the paint over time begins to crack and peel, reducing the attractiveness of the building.
The main component of alkyd paints is alkyd resin, which is obtained during the cooking process vegetable oils with acids. Unlike oil compositions, alkyd enamel has stronger adhesion and better resistance to weather conditions, resulting in a strong and durable protective layer when applied.
Acrylic compositions for exterior finishing of OSB are rarely used. This is due to the fact that they are based on water, which can lead to swelling and deformation of the slabs.
Acrylic paints are most often used for interior work in residential premises, because they are an environmentally friendly product, that is, during operation they do not emit harmful substances into the environment.
If you want to preserve the texture of OSB, then it is recommended to use colorless solvent-soluble varnishes for their finishing. When purchasing such compositions, you should make sure that they do not transmit ultraviolet radiation, as otherwise this will negatively affect the durability of the slabs.
DIY painting of oriented strand boards
Any Finishing work begin with surface preparation. And painting OSB in this regard is no exception.
Correctly performed preparation allows not only to increase the service life paint coating, but also reduce paint consumption, which will ultimately have a positive impact on your budget.
Preparatory work consists of the following stages:
- Leveling the surface. After the installation of the slabs is completed, the surface is carefully checked for unevenness, chips and other defects. After their discovery, they are carefully sealed with putty and sanded. If the situation requires it, the slabs can be completely puttied to obtain a perfectly flat surface.
- End processing. The most vulnerable part of the OSB is the edges, so it is necessary to pay attention to their preparation and further painting Special attention. All sharp edges of the edges are rounded with a radius of about 4-6 mm, carefully ground and primed.
- Finishing assembly seams. All seams between the plates are sealed with acrylic sealant. It is not recommended to use silicone mixture, as paint does not adhere to it well.
- Padding. Performed using a primer deep penetration, acrylic varnish or diluted PVA glue.
After the primer has dried (about 6-10 hours), you can proceed directly to painting. The paint can be applied using a brush or roller. The choice of one option or another depends on your preferences. First, the perimeter of the slab is painted, and then the entire remaining area.
Some beginners believe that it is better to apply one thick coat of paint than several thin ones. However, this opinion is absolutely wrong. This is due to the fact that a thick layer will lead to the formation of smudges, streaks and uneven drying of the paintwork material. Therefore, painting OSB is carried out in several approaches. In this case, each subsequent layer is applied after the previous one has completely dried.
Final part
OSB boards are an indispensable building material when it is necessary to erect a frame structure in as soon as possible and with minimal financial costs. Various materials can be used for external finishing of slabs: tiles, lining, siding, etc. However, the most popular finish is paint.
When choosing paints and varnishes, special attention should be paid to their composition. In this case, it is necessary to take into account not only the wood structure of the boards, but also the negative environmental factors that will affect the material during its operation.
Here you will receive detailed information about how and with what to paint an OSB board on the outside and what difficulties may be associated with the choice of paint. This building material appeared relatively recently. The correct abbreviation for these boards is oriented strand board, or OSB for short. Oriented strand board (OSB) is made from waste wood and needs to be protected from water and rot. Like other wood, OSB needs to be painted to protect it from moisture and, ultimately, from rotting and decay if it is located outside.
There are four classes of boards in total: from OSB-1 to OSB-4. Each class has its own purpose:
OSB-1 is used indoors as furniture elements;
OSB-2 is used in the production of composite I-beams;
OSB-3 has the same application as OSB-2, but at high humidity;
OSB-4 is also used in the production of composite I-beams for floors with increased load and humidity. In terms of strength characteristics, they rank after plywood and are ahead of chipboard.
In addition, the slabs are varnished, laminated and made with a tongue-and-groove joint. All four types of OSB boards, if they are located outside, need protection from mold and putrefactive fungi.
Did you know that oriented strand boards come in different thicknesses: from 6 to 22 mm.
Experts recommend using OSB-3 and OSB-4 for exterior work, but the first option is less preferable. Slabs of the third category do not have special protection against moisture, so they require additional processing. OSB-4 is much more expensive, so it is rarely chosen for facade work in the construction of economical housing.
The technology for preparing facades made of OSB boards for painting is the same for all types of paints.
Pore filling
First of all, it is necessary to fill the pores that the OSB boards s. Every tree contains hundreds of microscopic pores per square centimeter for the passage of water and nutrients. After the OSB board is formed and pressed, the sheets are polished. After grinding, microscopic pores open, and not only moisture can get into them, but also spores of mold and putrefactive fungi.
If the consumer wishes to leave natural look OSB boards and cover it with transparent wood varnish, then you need to use a special filler varnish.
Grinding
After the first application, the surface is sanded. This is a required step.
Sanding is done because the varnish raises microscopic fibers and the surface becomes like a hedgehog. These fibers are removed by sanding.
After the first layer of filler, apply the second. To obtain a high-quality surface, each subsequent layer of enamel or varnish is sanded. If such quality is not required, then grinding the primer or filler does not need to be done.
Before painting OSB, you need to select a primer. Its purpose is to fill pores in wood and create a preparatory layer for painting.
Primer
The industry produces five types of alkyd primers, and only glyphthalic is suitable for OSB. It is universal and suitable not only for wood, but also for concrete, glass and other materials. Glypthal primers (GF) can be used indoors and outdoors. They are liquid and easily penetrate into pores.
Their use not only significantly extends the service life of OSB boards, but also makes the painted surface water-repellent. Apply GF primer with a brush or roller. Drying time at room temperature is at least 24 hours.
Glypthal primer is fire hazardous and toxic. It is recommended to use it outside or in a ventilated area; a respirator will not help here.
Tip: before applying primer, you need to remove dust from the surface, preferably with a vacuum cleaner.
OSB boards must be primed several times with intermediate sanding of each layer until a flat and smooth surface is obtained. Why do you need to sand each layer? The fact is that the soil, filling the pores, creates a waviness that is invisible to the eye. And although these waves are measured in hundredths of a millimeter, in the sun, due to light and shadow, the OSB surface receives visible to the eye spots.
What to paint: types of paints for facades made of OSB boards
For exterior painting of oriented strand board, it is recommended to use four types of paints.
Alkyd paints
After priming and sanding the OSB, you can begin painting with alkyd enamels. The base for this paint is alkyd resins. This synthetic substance is obtained by treating vegetable oils with organic acids at high temperatures. This paint is applied with a roller, brush or spray. To obtain a high-quality surface, each layer must be sanded, and dust must be removed after each sanding.
Main advantages alkyd enamel– affordable price, resistance to sunlight and low temperatures(up to -30 degrees). It dries quite quickly (up to 10 hours), but is flammable and has a strong unpleasant odor.
Acrylic paints
Acrylic paints are a suspended water-dispersed mixture of dyes in a solution of acrylic resins and polyurethane. Distinctive feature acrylic - the use of water as a solvent, due to which this type of paint composition has become widely popular for external and internal work. Before painting the OSB board, it is necessary to apply an acrylic primer to it.
Acrylic paints for wood are opaque and after they dry, a durable film remains. To achieve different design effects, special substances are added to the paint - plasticizers to give it useful properties. Acrylic paints come in matte, semi-matte and glossy.
This best option- both in terms of cost and duration of operation. Quite unpretentious paint, easy to apply, resistant to various weather conditions. Wealth color range created using colors is a definite plus.
Oil paints
Oil paints are not suitable for external use in conditions of high humidity, although there are oil enamels for external use. This type of enamels was invented back in the last century. During this time, many paints with better characteristics appeared.
Preparation of OSB for oil paints is the same as for alkyd paints described above.
The OSB surface must be clean, dry, and free of grease. Primer for oil paint is applied to the slab. On top of the primer - at least two layers of paint. To obtain a high-quality surface, each layer must be sanded.
It is becoming less and less popular due to a large number of shortcomings. It is toxic, leaves streaks and takes a long time to dry. The durability of such a coating leaves much to be desired: under the influence of the sun and time, it fades and peels off. The price is above average.
Latex paints
Latex paints are obtained from the sap of rubber plants with the addition of thickeners, pigments, and plasticizers. They have excellent decorative properties. After removing the solvent, an elastic, durable film remains on the surface.
This paint is abrasion-resistant, not afraid of water, and can be washed. It comes in matte, semi-matte and glossy. To obtain gloss or dullness, special solvents are added to it in small quantities.
Before painting OSB facades, it is necessary to apply a latex primer. To obtain a high-quality surface, the requirements for slab preparation are increased. It must be cleaned of dust and dirt. Paint with rollers or a long-haired brush.
This is the most expensive, but most attractive option. The dense and durable latex coating reliably protects against impacts, scratches and natural factors, easily stretches with various base deformations.
Water-based paint is not used for OSB. For wood use water-dispersion paints, described above.
How to paint an OSB board outside: painting technology
How to properly carry out exterior painting work on OSB facades:
- Preparation: cleaning from dust, dirt, oils and other contaminants. If washed, it must be dried.
- Priming the surface with primers corresponding to the type of paint. Filling with special products to prepare OSB for varnishing.
- Sanding the surface with wood sandpaper of the appropriate grain size.
- Dust removal of the surface after grinding.
- Painting with the first layer of paint and drying until completely dry.
- Sanding the first layer to remove dust.
- Painting with a second coat of paint.
It is recommended to apply the coloring composition 2 times, although 3-4 stainings are often necessary. This is due not only to the protection of OSB from external factors, but also to aesthetics. Through thin layer paints show through large chips of material, negatively affecting appearance facade. It is important that each subsequent layer is applied only after the previous one has completely dried.
Different methods of decorative OSB coating - video
You can refine an OSB board or give it an antique effect using wood paints and varnishes.
It is necessary to paint OSB with overlapping layers, regardless of what you paint with - a roller or a brush.
Primers may only be used for paints as specified by the manufacturer.
White spirit is used as a solvent for alkyd paints. Turpentine, refined gasoline, RS-2, solvent, and xylene are also allowed.
There are no solvents for acrylic paints: they are diluted with water. To give acrylic paints a matte or glossy surface, special compounds called solvents are added. To remove dried paint, proprietary remover solutions are used.
For oil paints, there are their own thinners, which include: turpentine, white spirit, pinene, linseed oil.
Latex paints are diluted with water. It also washes off residues from brushes and rollers.
Sand the surface with sandpaper with a grit of 180-240. The OSB board is already sanded and its surface is ready for painting. Using coarse abrasives may result in scratches.
Painting OSB is associated with some difficulties, which, if not taken seriously, can lead to deformation of the material and uneven coating. From this guide you learned what paint is recommended for OSB boards and how to paint them if they are located outside the room
OSB boards are usually used for cladding frame or half-timbered houses. That is why the question of finishing the facade arises. You can choose siding or ceramic cladding, but these options are expensive and labor-intensive. Painting will be much cheaper. Various means can be used for this. on the street? This is discussed in the article.
Why do you need to paint slabs?
To understand whether OSB boards are painted, you should familiarize yourself with their composition and appearance. They are easy warm material, which is used in the construction of external structures, internal walls and partitions. The panels may differ in brand; for the outer part, dense products are used, the markings of which have the numbers 3 or 4. Since the material is created by pressing wood shavings and glue, it turns out breathable, environmentally friendly, but it is sensitive to atmospheric influences.
And when creating slabs, the chips are oriented longitudinally in the outer parts, and across the fibers in the middle. Because of this, the strength and thermal insulation properties of OSB boards are created. Is it necessary to paint OSB boards outdoors? The surface of the material is pleasant and warm to the touch, but does not have an entirely attractive appearance. That's why it needs to be painted.
Another reason for coverage special means protection of the material, and therefore the house, from destruction, moisture, mold, and fungi is considered. Although the products are moisture resistant, the connection areas are vulnerable. Therefore, such facades must be painted. Only before this, it is necessary to clean off dust, as well as putty and primer. It is important that there is a delay between procedures. After puttying, you need to allow at least 12 hours to dry. The same period is provided for complete drying of the primer.
Paints
Nowadays many types of paints and varnishes are sold. But not every one of them is suitable for this OSB board on the street; it must be determined after studying the paint properties and possibilities. When purchasing, keep in mind that the panels contain 90% wood. Therefore, you need to pay attention to the scope of application of the paint and varnish.
Alkyd
How to paint an OSB board outdoors to get a high-quality result? Alkyd paint great for these purposes. It is perfectly absorbed into wood and dries quickly due to its water component. But this fact is associated with a lack of funds.
The paint can be stored at positive temperatures, but when hardened it can withstand frost up to 30 degrees. The disadvantages include a low level of resistance to fire and alkalis. Alkyd paint is in demand due to:
- Absence unpleasant odor, harmful formations.
- Quick drying, long lasting color retention.
- Excellent hiding power or the ability to get flat surface no drips.
- Long service life.
- Affordable price.
Acrylic
How to paint an OSB board outdoors to protect the material from various influences? One that has a polymer component, colors and water is suitable. The main property required for outdoor service is the ability to create a reliable film.
Acrids have good adhesion and OCB. These properties influence the demand for paints for facade finishing. Manufacturers produce mixtures not only of rich shades, but also with different physical characteristics. The surface of acrylic paint can be matte or glossy, transparent or dull. Such mixtures:
- Dries quickly and is very durable.
- Used for processing porous, loose surfaces.
- They are water- and vapor-tight.
- Tolerates significant temperature changes.
Oily
How to paint an OSB board outdoors so that the material does not deteriorate from various influences? Oil paint is classic. Compared to modern mixtures, it is less in demand because it has some harmful properties:
- High toxicity. During operation you need to use
- Necessary long time for drying, since drying oil becomes the basis for obtaining paints.
- It takes experience to apply the product evenly.
- Due to its low durability, the surface needs to be renewed frequently.
The advantages include excellent absorption into the surface and ease of storage. Thick paint can be thinned with drying oil.
Latex
Which OSB boards are suitable for high-quality home protection? Latex paints suitable for wood are used. To create mixtures, ordinary water, acrylic resin, and latex polymer liquid substance are used. It is with it that ordinary acrylic enamel becomes a coloring composition.
The composition is based on polyvinyl, silicone, and other additives to improve performance. Facade paints are created to produce OSV with texture and density.
Water-based
If you are interested in what is the best way to paint an OSB board, then you should pay attention to water-based paint. It is used for finishing external walls. The product is suitable for renewing concrete and stone materials, which must first be treated with putty and primer. Aqueous emulsions are divided into:
- Silicate. The base includes liquid potassium glass. Steam resistant paints.
- Silicone. They contain silicone resin and fungicidal additives. After drying, they do not allow water to pass through and repel dust and dirt.
The best way to paint an OSB board on the outside is up to each owner to decide for himself. The above products are ideal for this job.
Coloring
These products are considered special, so their processing is carried out non-standardly. Working surface smooth, may be smooth and somewhat rough. Before finishing, the surface should be treated with a special tool.
The edges may be porous, so they absorb more pigment, resulting in uneven color. The defect can be eliminated using putty for exterior use. It will remove joints and seams, after which primer treatment is required. The procedure will improve the adhesion of the dye to the OSB panels. It also protects from harmful influences.
If defects or unevenness appear during installation, then the entire façade needs to be puttied. For outdoor work, paint is applied at least 2 times. A better visual result and a more durable surface is provided by painting in 3-4 layers.
Color options
How to paint an OSB board outside? This work can be done in one of the following ways:
- Spray gun or spray gun. This method is effective for an even, durable coating. Painting with such a device is quick, but it increases paint consumption. In addition, the mechanisms are expensive. This method can only be used in calm weather using a respirator.
- Paint brushes. This option is labor-intensive and time-consuming.
- Rollers are used to speed up the process. With this tool you can quickly and efficiently update large areas. Used for different mixtures.
Details
The internal surfaces of OSB boards are sprayed. You can also take a roller to paint the ceiling with water-based emulsion. In hard-to-reach areas, apply the product with a brush. When applying the first layer, you need to control the uniformity. If you use varnish on water based, then you need to monitor whether the slabs are deteriorating from moisture. Strokes should be done in one direction.
Before applying the next layer, you need to take breaks to dry the surface. To do this, you need to wait 6-8 hours, the time is determined by the type of paint. Drying should be natural at a stable temperature. Drafts should not be allowed.
The outer part of the house is exposed to negative factors, so you need to choose quality paint. You need to pay special attention to the ends. Sharp edges of the slabs should be rounded with a radius of about 4 mm. Then the surface is cleaned of dust and a primer is applied.
When choosing paint for the final finish, you need to pay attention to the aesthetics of clear varnishes. Many don't tolerate it well Sun rays. Water-based paints often deform slabs. Organosoluble, alkyd, oil products will be the most suitable. The principle of operation is the same as indoors. But at least 3 layers are applied to the facade.
Nuances
First you should touch the joints of the OSB boards. The treatment of these areas will be positive, but not for long, since during the installation of the house the slabs “play” and the putty cracks and falls out of the seams. This will negatively affect the appearance of the facade. There is another option for decorating narrow areas - using decorative overlays. They cover the seams after painting. They are needed as protection and a design element.
The painting activity is carried out from the top of the wall so that the paint does not flow onto the drying area. You also need to take the weather into account. It is preferable to do finishing at positive air temperatures.
It should be remembered that a painted facade is considered unpretentious during operation, but maintenance is still required. The materials are usually impact resistant. Walls must be washed regularly detergents, unless the manufacturer recommends something else. Do not use stiff bristled brushes as this will damage the finish.
Thus, OSB boards must be processed. Paint will be available and effective option. The house will be reliably protected from various adverse factors.
