Oriented strand board (OSB), when used inside a dry room, does not need any additional protection from moisture. IN worst conditions It turns out that the outer cladding of the house is made of this slab. Over time, it darkens not only from rain, but also from solar ultraviolet radiation. Of course, you can cover the slabs with siding or blockhouse, but this is associated with high costs. How to treat OSB boards against moisture is a difficult question. Let's try to answer it.
The moisture resistance of oriented strand boards is characterized by the amount of thickness swelling during the day. According to this parameter, according to the American standard PS 2, European EN-300 and Russian GOST 10632-89, slabs are divided into 4 types (see table).
| OSB-1 | 25 |
| OSB-2 | 20 |
| OSB-3 | 15 |
| OSB-4 | 12 |
Let us remind you that for the external cladding of a building it is allowed to use only OSB-3 and OSB-4 boards.
If the constructed structure is to be finished somehow, then during construction the OSB boards lie on the construction site in bundles. Even after one rain, the top few sheets swell almost one and a half times. They will remain like this after drying. The remaining sheets swell at the ends. By the way, to avoid this, the ends of North American products are painted with blood-red impregnation.
There is an opinion among some builders that OSB boards do not require additional processing, since they are already impregnated with resins, waxed, and varnished. Experience shows that after 2-3 years their appearance loses its original freshness, they darken, individual chips bulge here and there, and joints protrude sloppily.
Therefore, additional hydrophobic treatment will not be superfluous, especially if it is the facade of a residential building without any cladding. Let's consider how to treat OSB boards from moisture.
1. Transparent impregnations
The cheapest treatment option is water-repellent colorless impregnations. There are no special solutions for OSB. You can use any wood products, with the exception of water-based ones. Examples of such compositions:
- Elcon silicone-based antiseptic impregnation for wood. Designed for long-lasting protection wooden structures from weathering, rotting, mold. Scope of application: for interior and exterior work. Forms a water-repellent film, non-toxic, allows the wood to “breathe”.
- Innovative domestic hydrophobizing composition NEOGARD-Tree-40 based on organosilicon oligomers. Designed to impart water-repellent properties to products made of wood and wood-based materials: plywood, chipboard, fiberboard. Water absorption for chipboard is reduced by 15 - 25 times. Obviously, it is also suitable for OSB. Does not change the natural color of the material, the protective properties remain for at least 5 years.
2. Varnish coating
The most suitable for protecting wood (and OSB) from moisture is the so-called yacht varnish on a urethane-alkyd or alkyd-urethane basis. Some of the popular brands:
- Tikkurila UNIKA SUPER (Finland). This brand is a leader in resistance to environmental influences, immunity to ultraviolet radiation and temperature changes.
- Marshall protex (Türkiye). Creates a plastic surface film.
- Marshall Protex Yat Vernik. It has increased wear and moisture resistance.
- PARADE (Russia). Keeps fresh for a long time.
- Belinka Yacht (Russia). It has dirt- and water-repellent properties, emphasizing the texture of wood materials.
- Antiseptic varnish for wood “Drevolak” on an acrylic base with the addition of wax (Russia). Along with antiseptic and antibacterial effects, it successfully protects wood from moisture.
3. Coloring
Since OSB is a wood processing product, the same paints and varnishes can be used for them:
- Oil paints. Due to the presence of polymer resins in OSB, drying oil-based paints do not always adhere well to the surface being painted. For better adhesion to the base, it is recommended to perform double priming with intermediate putty before painting. Despite this, oil-based coatings under the influence of ultraviolet radiation, temperature changes and precipitation are prone to fading, cracking, and even peeling. We can recommend paint based on natural and modified oil PINOTEX WOOD OIL SPRAY, which has good resistance to external factors.
- Alkyd paints are better suited to particle boards because they contain alkyd resin, a product of the chemical reaction of natural oils with acids. Their adhesion is higher compared to oil-based paints, they dry faster and resist atmospheric influences more successfully.
- Acrylic compositions, being inexpensive and durable to use, have an optimal balance of qualities and are most in demand for painting wood. In addition, they are available in a wide range of colors.
Attention: pre-treat a small surface in an inconspicuous place to ensure that the material does not swell when exposed to the aqueous acrylic suspension.
In conclusion, we can say that the question: how to treat OSB boards against moisture is difficult to answer unequivocally. Firstly: it depends on whether you want to emphasize the texture of the slab with a transparent solution or, conversely, apply a covering (opaque) coating. Secondly: – on the financial capabilities and aesthetic ideas of the developer.
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. For this they can be used different means. How to paint OSB board outdoors? 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, interior 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 chips and glue, it is breathable, environmentally friendly, but it is sensitive to atmospheric influences.
When creating slabs, wood shavings and 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 material. How to paint an OSB board outdoors must be determined after studying the paint properties and capabilities. 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 low level resistance to fire, alkalis. Alkyd paint is in demand due to:
- No unpleasant odor or harmful formations.
- Quick drying, long lasting color retention.
- Excellent hiding power or the ability to obtain a smooth surface without drips.
- Long service life.
- Affordable price.
Acrylic
How to paint an OSB board outdoors to protect the material from various influences? Will do acrylic paint, having a polymer component, colors and water. 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 work, you must use protective equipment.
- 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
What paint to paint OSB boards 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's with her that it's normal acrylic enamel becomes a coloring compound.
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. The working surface is flat, it can 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. At outdoor work The 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.
- Paint rollers. 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 water-based varnish, you need to monitor whether the slabs are damaged by 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 outside of the house is exposed to negative factors, so you need to choose high-quality paint for it. 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 people do not tolerate sunlight well. Water based paints The slabs are often deformed. 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 an affordable and effective option. The house will be reliably protected from various adverse factors.
Frame house-building technology allows you to build comfortable housing quickly and inexpensively. The external walls of such a building are covered with OSB boards, which, unfortunately for all developers, do not have the aesthetic appeal required for the facade. Therefore, it is necessary to purchase material for cladding the house, which leads to higher construction costs.
Facade made of OSB boards
Manufacturers of paints and varnishes have taken into account the need of developers for finishing OSB boards and are offering their own solutions to this issue. Craftsmen who know how to create masterpieces from any material did not stand aside either. Thanks to these folk craftsmen, creative solutions for exterior finishing frame house.
Methods of decorative coating of OSB panels
Features of OSB boards
Production of OSB boards
Oriented strand boards (OSB) consist of several layers of chips and shavings pressed and glued together. A feature of the manufacturing technology of these types of panels is that the chips in the layers are located in different directions. This provides the material with high bending strength and allows it to securely hold the fastener. On the outer layers of the panel, the chips are located along the surface, on the inner layers - across.
Classification of OSB boards
But despite the longitudinal direction of the wood component, the front side of the panel does not have the smoothness necessary for high-quality painting. Both sides of the OSB board are uneven and rough. This feature has its pros and cons. The advantage is that the lack of smoothness allows you to get a surface with a spectacular texture. The disadvantage is the need for additional processing of the slab with various tools and materials.
The market offers several brands of oriented strand panels: OSB-1, OSB-2, OSB-3 and OSB-4. The latter are intended for front finishing and have a fairly smooth and effective surface. But in construction frame houses OSB-3 is most often used, since it is cheaper and has all the necessary characteristics for building walls. However, the surface of OSB-3 boards needs to be improved.
OSB - oriented strand boards
Since this material is most popular among developers, all the finishing methods proposed below take into account the peculiarities of the surface of these panels and can be applied to products of other brands: OSB-1 and OSB-2.
Choosing a method for painting OSB boards
Choosing a method for painting OSB boards
Transparent coatings
Coloring is the most inexpensive way, which will give the panels an aesthetic appeal. Many developers like the texture of the slabs, which they would like to preserve. The unevenness of the surface of the panels when the sun's rays fall creates a certain play of light and shadow. It is this effect that is most attractive in untreated OSB.
In order to preserve and enhance it, use transparent paint with an ultraviolet filter. For example, Cetol Filter 7 Plus. This composition is intended for exterior finishing wood and is made on the basis of alkyd resins. The coating is transparent and has a semi-matte finish. The paint contains a UV stabilizer and water repellents, providing reliable protection wood from environmental influences.
Cetol Filter 7 Plus
- clear varnishes;
- azure;
- transparent impregnations for wood.
Glazes are the most effective, as they have the ability to emphasize the grain of wood and give the painted surface a stylish shade and silky shine. Wide choose These compositions are offered by the manufacturer BELINKA, whose assortment includes the Toplazur line, which includes 66 colors and shades.
Belinka Toplasur
Transparent wood varnishes will add gloss to the surface of the slab. You can use oil-based, water-based or organic-based formulations. Reliably protects wood acrylic lacquer, and yacht will give it a beautiful shade. An inexpensive and practical solution is semi-matte transparent “Drevolak”, designed for coating untreated wood and brick. This composition is easily applied to OSB and fills all its unevenness.
Drevolak - water-based acrylic varnish for wood protection
Tinting OSB boards
To emphasize the texture of OSB, you can use stain. To obtain the desired shade, it is diluted either with water, or with a solvent or acetone.
Shades of stains
The technique for painting OSB with stain is as follows:
- apply paint using a paint brush or spray gun;
- give time to dry (when diluting the stain with a solvent or acetone, the drying time is 5-7 minutes);
- Apply polyurethane primer to a dry painted surface and wait for it to dry.
Tools for applying stain to wood
In the photo - OSB board decorated with stain
To obtain the effect of artificial aging, use a patina of the desired color. After it dries, sand the slab with a soft foam sponge, which allows you to remove any remaining patina. After which the patinated panel is coated with transparent varnish.
Gold patina paint for wood
Covering enamels
In order to completely hide the protrusions of chips, thick covering enamels and water-soluble paints are used. The choice is wide:
- silicone;
- alkyd;
- pentaphthalic (forming a dense smooth film);
- acrylic (water soluble);
- latex.
Oil paint for wood
They have the highest viscosity oil paints. Their advantage is that they are practically not absorbed into the slab. Therefore, paint consumption is relatively low. The disadvantage of these compositions is the long drying time. But they have the main advantage: a durable covering layer and good adhesion to the surface, which is important when painting OSB. However, oil paints are not recommended for external use due to their instability to moisture and ultraviolet radiation.
Tikkurila. Oil paint TEKHO
Alkyd paints meet all requirements for painting facades. These compositions form a thin polymer film on the treated surfaces, which is moisture resistant and does not change its color when exposed to sunlight. Alkyd enamels can withstand significant temperature changes, therefore they are recommended for use in regions with any climate.
Range of alkyd coatings
Silicone paints- one of the most expensive. This is the main reason for their low popularity. This is despite the fact that silicone enamels fully comply with all the requirements for facade work. These paints have good resistance to mechanical stress, are crack-resistant and moisture-repellent. These compounds can be applied to OSB boards that have already been painted or whitewashed.
Facade silicone paint
Latex paints have high moisture resistance, therefore they are best choice for regions with a maritime climate. Due to their excellent covering ability, they are not demanding on the quality of surfaces, which is especially important when finishing OSB boards. Facade latex paints can withstand a significant number of freeze-thaw cycles.
Latex water-based paint
The optimal choice for painting OSB is acrylic facade paints. They are inexpensive and have a lot of advantages: moisture resistant, withstand sudden temperature changes, vapor permeable, resistant to UV rays (do not fade in the sun). Acrylic paints can be applied at any time of the year. But in winter the air temperature should not be lower than -20°C.
Facade paint
Facade acrylic paint Ceresit CT 42
Fire protection of OSB boards
The OSB board burns with the release of caustic substances, including toxic hydrocyanic acid. In the event of a fire, smoke is the decisive factor for survival. Using Soppka paints, you can solve two important problems at once: painting the panel and increasing its fire resistance several times.
Soppka - experts in OSB protection
Soppka compositions and paints are designed specifically for finishing oriented strand boards, so the manufacturer takes into account all the features of the surfaces of this material. The company's products have excellent adhesion to OSB, which cannot be said about other fire retardant compounds. The service life of Soppka coatings is more than 15 years. Paints can withstand any environmental influences.
Conclusion
OSB can be painted with any high-quality facade paint designed for fire protection of wooden surfaces. Good reviews about "Valtti Color Satin" from "Tikurilla". This enamel has excellent covering ability, does not change its color when exposed to sunlight, prevents wood from rotting, and has a noble matte finish.
Valtti Color Satin
Tikkurila Vallty Color Satin
If you decide to give the OSB surface an ideal smoothness, additional processing will be required, including grinding, priming, and impregnation with an antiseptic. All these points have many nuances that you need to know about to get the desired result. Therefore, it is better to consider painting OSB boards using specific examples of application. various options finishing of these panels.
Preparing OSB boards for painting
OSB requires preparation before painting
Before painting, the oriented strand panels are prepared. First of all, they need to be primed. This is not as simple a task as it might seem at first glance. The fact is that the front surface of the new slabs is smooth and quite slippery, so the primer will collect in drops and flow down. For this reason, experts recommend not to waste time and money on priming new slabs, but to immediately begin filling or painting them.
Panels that have stood in the open air for some time lose their smoothness. front side. The surface becomes rough and able to absorb primer. The composition is applied with a roller on a long handle. The optimal choice is the Ceresit ST17 primer, the quality of which has been tested by time.
Primer ST 17
Technique for painting OSB boards
When applying paint with a brush or roller, you may notice that some chips swell from moisture and rise. This happens regardless of the type of composition chosen. If you need a budget solution for finishing the facade, you can ignore these small shortcomings.
But if you intend to complete all the work with the highest possible quality, you need to adhere to the following technique:
- priming the panel;
- installation of fiberglass mesh over the entire façade area;
- puttying with a moisture-resistant and frost-resistant composition;
- coloring.
When choosing elastic paints (for example, Descartes or Emarque), the puttying step can be skipped. These paints will fit perfectly on the mesh and cover it. After applying the second layer, the OSB will acquire a smooth, glossy surface.
OSB painting with artificial aging effect
This method of processing OSB panels allows you to preserve the surface texture while smoothing out the most noticeable chip protrusions. The end result is a smooth slab, on which its natural pattern is clearly visible. Using multi-layer dyeing with compositions of different colors and purposes, they provide two stylish effects at once: colored dyeing and artificial aging.
Tools and materials that will be required to complete the work
- Angle grinder (grinder).
- Abrasive grinding wheels of different grain sizes: P180 and P320. You can use modern abrasive Velcro tapes, one side of which is self-adhesive.
- Abrasive sponge P320.
Abrasive sponge fine grain P 280-P320
- Airbrush or spray gun.
- Primers: FI M194 and FL M042/CO2.
Primer FL-M042/C02 Renner
- Acrylic varnish “Mother of Pearl” JW M120.
- Tinted varnish JO 00M294.
- Patina GM M048/Black.
Stages of painting OSB boards
Step 1: Sanding the Panel
Smooth out uneven surfaces of the panel using a grinder and grinding wheel P180. To obtain the desired result, work with light pressure from the tool. The panels are passed over each section with an abrasive wheel no more than three times.
Sanding OSB
Step 2: Apply the first coat of primer
OSB boards are made using a special adhesive impregnation, which includes various resins, wax and paraffin. These substances are necessary to prevent the panel from delaminating and the formation of rot and mold in it.
Primer for OSB
Applying primer
A primer on the sanded OSB surface is needed to ensure that the resins and paraffin continue to remain inside the slab. At this stage of work, barrier primer FI M194 is used. It is applied using an airbrush or spray gun. Material consumption is within 50-60 g/m2. Further work begins after 1.5-2 hours, after the soil has completely dried.
Step 3. Applying pigment primer
At this stage of the work, the panel is covered with primer FL M042/CO2. This is a matte white composition that dries within 2.5-3 hours. The soil consumption should be at least 100 g/m2.
Step 4: Sanding the slab
Use a grinder with a P320 abrasive wheel. Only the top layer of pigment primer is removed. The result should be a smooth whitish matte surface.
Primed surface
Step 5. Varnishing the slab
Acrylic varnish “Pearl” JW M120 is applied to the OSB so that the weight of the wet layer is 100-120 g/m2. In order to achieve this result, each section of the panel must be covered with 2-3 layers of varnish. Then wait for the coating to dry completely for an hour.
Step 6. Patination
At this stage of work, black patina GM M048 is applied to the panel. As before, an airbrush or spray gun is used for this purpose. The weight of the wet layer should be 60-80 g/m2. There should be no gaps in the panel from the previous white layer. The patina dries within 5-7 minutes.
Patina for wood Renner GM M048/C01
Step 7: Sanding the Patina
Using light pressure, sand the panel with a P320 abrasive sponge. After such processing, the result should be a surface with a clear chip pattern, the main part of which white, and the spaces between the chips are black. This provides an artificial aging effect.
Remove excess patina with a sponge
Step 8. Tinting the OSB board
Tinting is the stage as a result of which the slab acquires color. To perform this task, acrylic varnish is used. The color is chosen depending on how you want the facade of your house to look. Varnish consumption is within 100-120 g/m2. Drying time according to the manufacturer's instructions, but on average 1.5-2 hours.
Acrylic lacquer
It should be noted that as the varnish dries, its color will change due to the gradual acquisition of dullness. This example uses JO 00M294 zero gloss varnish. If you want to give the façade of your home a glossy look, you can opt for compounds that provide this effect.
Example of applying varnish with a brush
Technology of painting OSB with primer-paint
This method of painting oriented strand boards was developed by Holzer specifically for façade finishing. frame buildings. Therefore, the instructions offered by the manufacturer use exclusively its products.
Tools and materials required to perform the work
- A spatula with a narrow metal blade.
- Holzer Festspachtel Elastich putty.
Putty Holzer Festspachtel Elasticch
- Holzer primer color.
Holzer primer color
- Roller for applying paint (with a foam or faux fur coat).
- Container (tray) for paint.
If desired, you can use narrow decorative panels, with the help of which they decorate the facade in the “half-timbered” style.
Finish example
Instead of plastic panels you can attach thin ones wooden blocks, pre-treated with an antiseptic and painted in a color that harmonizes with the façade finish.
Stages of work
Step 1. Puttying the seams between OSB boards
Holzer Festspachtel Elastisch putty is applied to the seams between OSB boards. Use a spatula to press the compound into the gaps and spread the putty at a distance of 5-7 cm from the seams. They strive to smooth out the composition in such a way as to obtain a smooth surface without visible cracks. Wait for the composition to harden.
Puttying
Step 2: Painting the panel
Using a roller, Holzer primer is applied to the slab.
Application of primer
The soil dries in about 6 hours
You can choose any color from the manufacturer’s catalog (there are more than 7 thousand colors in stock). If used fur roller, it is preliminarily kept in water for 1.5-2 hours. If a bucket is chosen as a container for paint, you need to prepare a small piece of plywood on which to roll out the roller, removing excess paint from its coat.
Coloring technique:
- paint is poured into the container;
- dip the roller in paint and roll it several times over a special part of the tray or plywood;
- Apply paint to the wall so that each next layer overlaps the previous one by 4-5 cm.
Holzer paints have good covering power, so even surfaces do not require a double coat. But in the case of OSB, it will be necessary to properly paint all the protrusions and recesses. Therefore, the manufacturer recommends painting with vertical strokes on the first day of work, and horizontal strokes on the second day. In this case, the coating will acquire the thickness and strength necessary for facades.
Video - Creative finishing of OSB boards
Video - Painting OSB boards
Cladding processes are increasingly carried out using oriented strand boards, which have excellent qualities and allow installation to be completed in a short time. For subsequent finishing of the resulting coatings, various ways, including painting. This method is simple, but has nuances, without which it will not be possible to achieve an acceptable result.
Selection of composition for external and interior decoration OSB boards
In order to paint OSB with high quality with your own hands, you need to take a responsible approach to choosing the mixture.
Several types of material can be used.
Organosoluble
One of the simplest and most popular solutions, the composition provides fairly high adhesion to the surface of OSB panels. Traditional options:
- Oily. Coloring with such mixtures is widespread, although in last years decreases. This is explained by the fact that the products are quite toxic and have a pungent odor. The resulting coating has a service life of 3–5 years, after which it fades and loses its decorative qualities.
Oil paint has good adhesion and high covering power, but has a strong odor
- Alkyd. A universal variety that allows painting inside and outside the premises. The treated surface has a bright and rich color that lasts for a long time. Compared to the previous version, enamel is more resistant to any weather conditions, but is not environmentally friendly and has a wide decorative range.
Alkyd enamel is usually used for exterior work because it is not environmentally friendly and has a toxic odor.
Water-based
The most modern products with high aesthetic and performance qualities. For processing OSB, compositions with a polymer component are used. This list includes:
- Acrylic. The mixtures are absolutely safe, UV resistant and easy to apply. When working with particle boards, water-based compositions require high-quality priming and application of the solution in thin layers. It is necessary to prevent excessive moisture absorption, otherwise the panel may swell.
Acrylic paint is an environmentally friendly, vapor-permeable and fireproof composition
- Latex. Painting a surface with such a mixture is quite simple; the material has almost the same advantages as the previous one, but is more expensive. This includes the rubber variety, ideal for outdoor use.
Latex paints have excellent moisture resistance, but are expensive
Primer paint for OSB
On a note! When choosing a composition for different processes, it is better to give preference to certain categories, even taking into account the fact that many mixtures are universal. This is especially true for facade work, so in such a situation it is advisable to purchase special solutions.
Primer
Due to the fact that OSB-3 boards, which have low adhesion due to additional treatment against moisture penetration, are most often used for cladding interior structures of premises and facades, priming is a mandatory procedure. In addition, this significantly reduces paint consumption and reduces the likelihood of deformation when choosing water-based compositions.
The following varieties are suitable for this work:
- Drying oil. This is a simple solution if you plan to use oil paints.
Drying oil Oksol
- Concrete contact. Although any modern polymer-based compositions classified as deeply penetrating can be used, this mixture is optimal. It fits well on the surface and impregnates it, forming a rough layer that provides the best adhesion.
Concrete contact primer is used to ensure maximum adhesion of paint to the OSB surface
After laying and drying any type of soil, it is necessary to quickly treat the base with decorative or protective materials. During this period, adhesion is maximum.
Impregnation
The following varieties are used:
- Stain. Like drying oil, it helps protect the material from the harmful effects of water, preventing rotting. Although the outside of the building is sheathed with moisture-resistant products of classes 3 and 4, OSB-2 boards are most often found inside; they are processed separately. Stain is also applied as a decorative layer when covering panels with varnish.
- Fire retardants. They are recommended to process all sides and ends of parts before installation. Fire retardant impregnation reduces the likelihood of fire and also increases the time during which the material will be resistant to flame.
- Antiseptics. Such protection is required to prevent the appearance of mold and mildew, which are most often caused by dampness.
Universal deep-penetrating antiseptic
Important! Special attention it is necessary to pay attention to the ends of parts located on the street. They are impregnated more thoroughly, since it is in these places that destruction begins, caused by the harmful effects of the environment.
This composition is more suitable for indoor work. For floors or ceilings, colorless varnish is more often used to ensure the preservation of the natural appearance of the material. To enhance the ambience, well-defined wood chips can be treated with a stain of a suitable color, which is not just applied, but literally shaded.
To convey texture natural wood choose colored varnishes. But the structure of the panel is extremely heterogeneous, so obtaining a uniform coating will not be so easy, regardless of the chosen paint and varnish mixture. The desired result can be achieved by painting the base 3 to 6 times.
Colored varnishes can imitate a variety of wood types
Features of painting OSB boards outside
Work on the street involves the creation of a decorative layer, which will also play a protective role. For the process you will need a simple list of tools, suitable for covering walls inside the house:
- Spray gun. For each composition, the desired option is selected.
- Paint roller. It is better to provide several replaceable nozzles.
- Tassels. For work in hard-to-reach places.
Everything you need is purchased in advance.
Surface preparation
Before installing the sheets, high-quality impregnation of the ends of the parts is carried out. Further actions:
- If you paint an OSB board outdoors, a significant problem may arise: materials of class 3 or 4 are covered protective composition from moisture penetration. This layer must be removed, otherwise it will not be possible to ensure good adhesion. This will also create the desired plane.
- If necessary, the surface is treated with impregnations. After they dry, the base can be primed.
- Exterior finishing rarely involves complete plastering of the surface. To level the seam between adjacent parts, there are two methods: the joints are sealed with a mixture of PVA and sawdust, or overlays are installed, the role of which can be played wooden slats. This will also hide the screws.
Wooden overlays allow you to hide the joints between the slabs and give the building a unique appearance
- If you need to get a uniformly colored surface, then the cracks are covered with an elastic compound and covered with serpyanka, then a layer of putty is laid. It can also be accompanied by reinforcing mesh.
- Priming is repeated.
After all processes are completed, the facade is left to dry completely.
Applying paint
You can cover the prepared surface with the selected solution according to the following scheme:
- If necessary, the composition is diluted to the desired consistency. To spray, it must be more liquid, but because of this the number of layers increases and the consumption increases significantly.
- The solution begins to be laid from top to bottom in a single layer.
- The pronounced dark areas that appear are left, they are eliminated only evenly and consistently.
- Next, layer by layer is laid until the desired result is achieved. After each treatment, the base dries out.
If you carry out all the steps without haste, you will end up with a coating with a slightly protruding texture of wood chips.
Painting slabs indoors
The process can be performed in two ways, depending on preference. But preliminary preparations are carried out, almost similar to those for external areas. The only difference is that moldings are not used to hide seams inside the house, unless provided for by the interior design.
Classic method
This method involves simply applying OSB paint to the wall surface. After preparing the base, the decorative mixture is mixed and applied evenly and sequentially in several layers to all treated areas. If putty was previously used, the painted surface will be uniform, but if it is absent, a strong or weak texture will be observed, depending on the amount of material applied.
Painting OSB without prior puttying allows you to preserve the texture of the material
It is much easier to treat the floor: after sanding, it is prepared and covered with 4-5 layers of clear varnish.
Decorative method
To decorate the base of oriented strand panels beautifully, you can use various techniques. For example, aging of the coating. Instructions:
- The slabs are carefully sanded and primed until smooth.
- Acrylic patina is being prepared. It is quickly applied to the desired areas or the entire surface. The longer the mixture sits on the base, the richer the color becomes.
- The solution is wiped off with a rag.
- Next, you need to paint the material with a light shade to highlight the darker areas.
An alternative method would be to simply layer several colors, but each subsequent layer should be “softer” than the previous one.
Caring for painted OSB
With the correct choice of decorative composition and compliance with the preparation and application technology, further procedures will be as follows:
- After 5-7 years (depending on the composition), a light treatment with a thin layer of diluted solution can be performed to revitalize the surface.
- Significant difficulties arise due to the shrinkage of the house; more serious reconstruction may be required. But if the frame was positioned accurately, observing the gaps, then you will only need to rearrange the moldings on the outside and small Finishing work inside followed by painting in the desired color.
- Worn flooring is re-sanded and varnished.
Painting OSB is not the most difficult process, requiring accuracy and a precise sequence of all actions to obtain a high-quality result.
Many builders sheathe the outside of the house with OSB (OSB) boards. This material is affordable and of high quality. When the time comes to carry out the final work, the craftsmen think about how to paint the OSB board on? To make the right choice you need to study everything possible options, used for this product.
What is OSB board?
The first OSB boards have already been created more than thirty years ago during mass developments from frame materials. Most residents of Canada, the USA and many Europeans live in such houses.
For the first houses built according to frame technology, was required reliable casing, resistant to sun rays and moisture. Wood was not suitable for this type of installation, as its installation took too much time and effort.
Plastering
This option OSB coatings panels are the most popular and justified for outdoor work. This type of finish has a number of features:
Siding
The use of sheathing with the installation of siding panels is economical way which helps improve the appearance of the building.
Siding can be fixed to the installed OSB surface.
There are a large number of options for siding panels, so if you wish, you can choose a model that imitates a block house or brickwork.
The advantage of such cladding is that if OSB boards are already glued to the side of the facade, it is not necessary to mount an even frame. However, you can't do without a membrane which will protect from wind and moisture.
If this additional fastening is not installed, the siding will periodically sweat from the inside, and the OSB will swell under the influence of moisture.
If you choose between two types - PVC or acrylic, then you can choose any type, since there are no significant differences between them.
Facing products are produced in one thickness, varying from 0.8 to 1.3 millimeters. They are able to withstand temperatures reaching 80 degrees Celsius, and exposure to sunlight, under which they do not fade.
Both types are highly resistant to the spread of fire and chemical reagents. Acrylic panels have a rich color, but otherwise are almost no different from PVC products.
Is it possible to attach siding directly to OSB? For practical advice on installing siding from professionals, watch the video:
How to plaster a slab outside the house?
The question of whether it is possible to putty the surface of OSB boards is controversial: some experts believe that this coating will not protect the product from the appearance of cracks on the surface of the facade. Others, on the contrary, recommend using an additional coating, because it will refresh gloomy wooden panels and serve as protection against moisture and dust.
Carrying out high-quality work on plastering the facade of the building can be done subject to the following conditions:
- the surface must be coated with an adhesive compound before carrying out work;
- the solution applied to the surface with a spatula should not be thinner than three millimeters;
- use of reinforcing mesh after applying the first layer;
- covering the surface with an adhesive composition after the first layer has dried.
The surface of OSB slabs visually looks decent, and some home owners leave them at this stage and do not carry out additional work on cladding the building.
Many experts still recommend covering the slabs with plaster - this will not only give the house individual features, but also protects against external damage. In order to perform plastering efficiently, you need to follow the sequence of work:
- When applying the first layer, you should try to run a wide spatula along the wall to fill all the recesses on the OSB. For correct application you need to move the tool along the wall in arcuate movements. Completion of the first layer should not be accompanied by streaks along the surface to be coated.
- After the first layer has completely dried, clean the wall with an abrasive mesh and repeat the application of putty.
- In order to achieve ideal surface with a smooth shine, you need to apply at least five successive layers.
- After applying the putty, the surface must be dried, after which a layer of paint can be applied to it.
The question of what is the best way to carry out work on filling panels is even asked experienced craftsmen. The work process can be complicated by the fact that most putty materials do not adhere well to wood surfaces.
Therefore, you need to choose those coating models that have the highest adhesion to a wooden surface.
In order for the work to be completed successfully, it is recommended to pay attention on a mixture of Rodband and Goldband. These mixtures are made on a gypsum basis with admixtures of polymer materials.
If the owner of the premises wants to save on putty material, then it is better to purchase Rodband, its texture is more rigid than that of Goldband, and the price is much lower.
The selection of finishing is also important, and should be approached carefully. In order not to make a mistake with this choice, it is recommended to purchase Vitonit KR mixture.
Installation of porcelain tiles
Porcelain tiles are suitable for gluing to OSB walls, but is it necessary to carry out such serious work that can also cause damage to building structures?
Porcelain stoneware tiles are resistant to fungal growth, moisture and mold. One of the most important advantages of this material is considered to be stability and a wide range of products in stores. All these advantages are suitable for carrying out interior work, but not external ones.
OSB panels can be tiled indoors, for example on the floor, but external works Not recommended.
Craftsmen do not use porcelain stoneware in facade work one at a time main reason – the wall surface must be ventilated in order to avoid waterlogging and swelling of the panels.
OSB coloring agents
In addition to water-repellent protection, paint coating provides a number of advantages for the surface:
- the coating can protect wooden surfaces from premature deformation;
- if large chips are noticeable on the surface of the wall, they can easily be hidden after applying the impregnating solution;
- Compared to other materials, painting is quite cheap and is not inferior in protective qualities.
Typically, for outdoor finishing, OSB-3 or OSB-4 is used, which are the most resistant to weather conditions. Not every owner can purchase OSB-4, since this material is highly expensive and resistant to mechanical stress. If the “four” is completely protected, then OSB-3 requires additional coating.
The boards are made from wood, which is the main component of the product, giving it environmental properties. At the same time, such a natural composition makes the wood product vulnerable to the onslaught of weather conditions.
You can provide additional protection with siding, artificial stone, or the most common and easy-to-install material – paint.
When choosing a composition suitable for outdoor use, you can pay attention to all mixtures intended for working with wooden surfaces.
It is necessary to avoid coatings that spoil the appearance of the facade. These include glazing substances and gloss varnishes. These compounds will show off and highlight the texture of the chips, which is not particularly attractive. Therefore, it is better to refuse such products.
The following compositions are suitable for coating OSB boards:
- Latex compounds.
- Alkyd paint.
- Acrylic mixtures.
- Oil mixtures.
Latex paint contains substances that are most suitable for working with wood materials. After application, the paint is not subject to stretching and does not leave smudges. The disadvantage of this option is high cost of material.
Often used in such work. Its peculiarity is that it looks attractive after being applied to the wall. This composition takes a long time to dry, sometimes up to eleven hours. The composition evaporates before it dries completely. bad smell. After drying the composition, the smell disappears.
Paint is capable withstand elevated temperatures, but is not resistant to fire and alkalis that get on the surface of the product.
They are also often used, but if you read the composition of this paint, it will become obvious that it is not an ideal option for OSB coating because it contains water. Water-based paints in contact with OSB panels capable of spoiling their composition.
But if the panel is strong enough, then you can use an acrylic composition, which has undeniable advantages: resistance to sunlight, smooth coating and the ability to stay on the facade for more than eight years.
But it is important to remember that if you leave jars of paint at a low temperature, the composition will deteriorate, because water turns into ice. The composition without water will be unsuitable for further use.
Previously they were widely used, but today they are almost out of use. This happened due to the displacement of this mixture by other more popular ones.
Oil suspensions toxic in composition, and the work has to be carried out in special masks or a respirator. The oil takes too long to dry and spreads over the painted surface, which of course requires additional effort to restore the wall and eliminate smudges.
After work on applying the suspension, rags often form that spoil the appearance of the facade. Another unpleasant property of this paint is the impossibility of covering it with a new composition that differs in components.
In order for the painting job to be completed safely and without additional effort and touch-ups, you need to remember a number of features of the wooden material:
- If there are sharp protrusions on the building, they will contribute to the spreading of the paint composition. If there are such corners, they need to be rounded, as in a plasterboard;
- the edges and joints of the slabs must be puttied to eliminate possible difficulties in applying and making the wall smooth;
- The question of whether it is necessary to prime the surface between the wood and the paint should not arise, because there is a clear answer to it - yes. This action is mandatory for precise adhesion between the paint and the material;
- if the owner wants to achieve an even application of the composition over the entire surface of the wall, he will need to apply finishing putty to all the slabs;
The number of times for applying paint is determined individually, but experts advise painting at least four times. After the paint has been thoroughly absorbed into wooden surface the color of the product will become saturated, and the strength of the composition will noticeably increase.
It is important to remember that each layer has its own time to dry, and you cannot start painting before the previous mixture has dried.
Exterior finishing of a frame house made of OSB with paint - watch the video:
Oriented strand board (OSB), when used inside a dry room, does not require any additional protection from moisture. The worst conditions are found on the outer cladding of a house made from this slab. Over time, it darkens not only from rain, but also from solar ultraviolet radiation. Of course, you can cover the slabs with siding or blockhouse, but this is associated with high costs. How to treat OSB boards against moisture is a difficult question. Let's try to answer it.
Is additional processing needed?
The moisture resistance of oriented strand boards is characterized by the amount of thickness swelling during the day. According to this parameter, according to the American standard PS 2, European EN-300 and Russian GOST 10632-89, slabs are divided into 4 types (see table).
Let us remind you that for the external cladding of a building it is allowed to use only OSB-3 and OSB-4 boards.
If the constructed structure is to be finished somehow, then during construction the OSB boards lie on the construction site in bundles. Even after one rain, the top few sheets swell almost one and a half times. They will remain like this after drying. The remaining sheets swell at the ends. By the way, to avoid this, the ends of North American products are painted with blood-red impregnation.
There is an opinion among some builders that OSB boards do not require additional processing, since they are already impregnated with resins, waxed, and varnished. Experience shows that after 2-3 years their appearance loses its original freshness, they darken, individual chips bulge here and there, and joints protrude sloppily.
Therefore, additional hydrophobic treatment will not be superfluous, especially if it is the facade of a residential building without any cladding. Let's consider how to treat OSB boards from moisture.
1. Transparent impregnations
The cheapest treatment option is water-repellent colorless impregnations. There are no special solutions for OSB. You can use any wood products, with the exception of water-based ones. Examples of such compositions:
- Elcon silicone-based antiseptic impregnation for wood. Designed for long-term protection of wooden structures from weathering, rot, and mold. Scope of application: for interior and exterior work. Forms a water-repellent film, non-toxic, allows the wood to “breathe”.
- Innovative domestic hydrophobizing composition NEOGARD-Tree-40 based on organosilicon oligomers. Designed to impart water-repellent properties to products made of wood and wood-based materials: plywood, chipboard, fiberboard. Water absorption for chipboard is reduced by 15 - 25 times. Obviously, it is also suitable for OSB. Does not change the natural color of the material, the protective properties remain for at least 5 years.
The most suitable for protecting wood (and OSB) from moisture is the so-called yacht varnish on a urethane-alkyd or alkyd-urethane basis. Some of the popular brands:
- Tikkurila UNIKA SUPER (Finland). This brand is a leader in resistance to environmental influences, immunity to ultraviolet radiation and temperature changes.
- Marshall protex (Türkiye). Creates a plastic surface film.
- Marshall Protex Yat Vernik. It has increased wear and moisture resistance.
- PARADE (Russia). Keeps fresh for a long time.
- Belinka Yacht (Russia). It has dirt- and water-repellent properties, emphasizing the texture of wood materials.
- Antiseptic varnish for wood “Drevolak” on an acrylic base with the addition of wax (Russia). Along with antiseptic and antibacterial effects, it successfully protects wood from moisture.
Since OSB is a wood processing product, the same paints and varnishes can be used for them:
- Oil paints. Due to the presence of polymer resins in OSB, drying oil-based paints do not always adhere well to the surface being painted. For better adhesion to the base, it is recommended to perform double priming with intermediate putty before painting. Despite this, oil-based coatings under the influence of ultraviolet radiation, temperature changes and precipitation are prone to fading, cracking, and even peeling. We can recommend paint based on natural and modified oil PINOTEX WOOD OIL SPRAY, which has good resistance to external factors.
- Alkyd paints are better suited to particle boards because they contain alkyd resin, a product of the chemical reaction of natural oils with acids. Their adhesion is higher compared to oil-based paints, they dry faster and resist atmospheric influences more successfully.
- Acrylic compositions, being inexpensive and durable to use, have an optimal balance of qualities and are most in demand for painting wood. In addition, they are available in a wide range of colors.
Attention: pre-treat a small surface in an inconspicuous place to ensure that the material does not swell when exposed to the aqueous acrylic suspension.
In conclusion, we can say that the question: how to treat OSB boards against moisture is difficult to answer unequivocally. Firstly: it depends on whether you want to emphasize the texture of the slab with a transparent solution or, conversely, apply a covering (opaque) coating. Secondly: – on the financial capabilities and aesthetic ideas of the developer.
For renovations in apartments, as well as for the construction of individual frame houses, relatively new material, which is called oriented strand board (OSB or OSB, if you use the transliteration from English).
The use of OSB boards makes it quite easy to fill large areas with light, even and solid foundation without spending on it large quantity time and money.
However, after completing this work, the question often arises of how to cover the OSB board in order to preserve its appearance and operational properties on long term. In this article we will give several practical advice how to finish the decoration various designs made from OSB.
Where are OSB boards used?
The growing popularity of OSB determines their use in a variety of areas, from construction to the production of furniture, packaging and interior decoration of truck bodies. Most often, the problem of surface treatment occurs when carrying out the following types of work:
- flooring;
- installation of internal partitions and ceilings;
- external cladding of frame houses.
The greatest difficulty is caused by painting OSB boards located on outdoors, since the coating used must adhere securely to the surface of the slab and protect it from external influences ( sunlight, water, snow, etc.) and withstand significant temperature changes.
OSB surface finishing for flooring
For building flat surface under finishing floors are used. This category has sufficient strength and moisture resistance to provide a reliable foundation for floors laid either on concrete screed, and on wooden joists located directly above open ground.
Depending on the type of flooring, different types of coatings can be laid on the OSB board:
- Varnish. Varnish is applied in several layers onto a thoroughly cleaned and degreased surface. If increased demands are placed on the quality of the floor, it is better to use sanded slabs, otherwise the base must be treated with sandpaper or a wire brush, sanded by hand and then primed. After varnishing, the surface of the slab retains its structure and forms a flat and smooth surface.
- Roll materials. To cover with linoleum or carpet, it is necessary to ensure that there are no irregularities in the contact areas of the plates. To do this, expansion gaps are treated with elastic silicone sealant and thoroughly cleaned. Best results obtained by using slabs of minimal thickness.
- Tile. To install tiles, it is necessary to use special adhesives to join ceramics and wood.
- . When using this floor covering, you only need to prepare a flat base, which, if done correctly, turns out to be almost ideal.
Finishing of internal partitions
The manufacturing technology of OSB boards involves the use of various binders, such as resins, dyes, essential oils, etc. When finishing materials are directly applied, these substances may appear on subsequent layers of coating. Therefore, finishing OSB indoors should begin with applying a primer.
Some slab manufacturers add wax or paraffin to the resins, so that their working surface becomes smooth and slippery. To work with such slabs, it is necessary to use a primer paint containing quartz sand, which helps the following coating elements to adhere to the surface.
After priming, the OSB board can be treated with any facing materials:
- Varnish. The technology for using varnish is the same as for installing floors.
- Dye. It is better to use water-based paints and varnishes, as they allow steam to pass through better, which provides a more comfortable microclimate in the room. Typically, the same paints are used for interior work as for regular wood. When using water-based paints, some deformation of the slab is possible due to the swelling of wood chips in it, so before use it is advisable to evaluate the effect of a particular coating on a test panel.
- Wallpaper. It is not recommended to glue wallpaper directly onto the slab for the reasons described above. They are fixed to a pre-primed wall using wallpaper glue with the addition of PVA.
External finishing of OSB boards
The use of oriented strand boards as external cladding requires compliance with certain rules arising from. Of course, the optimal solution is to use traditional types of finishing - clinker tiles, siding or lining, but often the use of OSB in construction is dictated by the need to obtain results with at the lowest cost Therefore, OSB painting is the most popular.
Sheathed OSB outer wall Houses
Any dye intended for external processing ordinary wood. It is especially important to consider the following points:
- The most vulnerable part of the OSB board is its ends. Therefore, to treat the expansion gap between the plates, it is necessary to use acrylic sealant and carefully ensure that it evenly fills all existing cavities.
- Experts recommend processing all sharp edges and edges until curves with a radius of at least 3 mm are formed. This is necessary for even distribution of paint over the surface of the slab.
- All surfaces must be primed and sealed before applying the final coating.
It is necessary to take into account that the most porous part of the slab is its edge, so it is necessary to carefully monitor its processing, given that it absorbs more paint than the main plane of the slab.
- The use of water-based priming and sealing solutions can cause the wood fibers to swell over time, so sanding is sometimes required after drying.
- The paint must be applied in several thin layers. Before applying a new layer, you must wait until the previous one has dried.
- When choosing what to paint an OSB board with, you must keep in mind that some types of transparent dyes may lose their properties when exposed to sunlight. It is best to use water-based or oil-based paints, since water-based paints can cause surface deformation, they are recommended to treat areas that do not have high requirements for appearance. Otherwise, it is better to use oil-based formulations.
Thus, in most cases, to treat surfaces made of OSB panels, you can use the same Decoration Materials, as for a regular solid board. At the same time, such products are easy to install, form an even layer and can withstand the required load well. Therefore, OSB boards are the optimal solution for quick and inexpensive installation of building structures.
