Osb board painting interior finishing. What is the best way to paint a slab.

Today, many homeowners use OSB to decorate their homes. These slabs are easy to attach and, if necessary, dismantle, screws can easily pass through them and, moreover, they are an environmentally friendly material. The board consists of several layers of wood, forming a variegated surface that is difficult to paint. Therefore, it would be useful to know several features of the process that greatly facilitate the solution of this difficult task.

Slab primer

Painting an OSB board begins with priming its surface. To do this, you can use PVA glue diluted with water or a deep penetration primer.

Water for diluting glue must be filtered.

The slab can be primed using water-based varnish, which can be acrylic or acrylic-polyurethane. To do this, the varnish is diluted with water, maintaining a ratio of 1:10, one part of water to ten parts of varnish.

Instead of a deep penetration primer, you can also use an alkyd-based varnish, which must be diluted before application with white spirit.

It is worth noting that alkyd varnish gives the slab a yellowish appearance.

After this primer layer has dried, and this happens no earlier than after 8 hours, the slab can be painted.

Painting the slab

To paint OSB boards, you can use water-based or oil-based paints. It can be applied with a brush, roller or spray.

You should not use water-based paint, as it can cause the slab to swell.

As you know, paint tends to spread on sharp corners. Therefore, before starting work, round the corners of the slab with light sanding. This is especially true for OSB used for exterior finishing.

First, the perimeter of the slab is painted and only then the rest of the surface. In this case, increased attention must be paid to painting the edge, the surface of which is more porous than the plane of the slab. Therefore, special attention must be paid to sealing the edges, which is carried out even before applying the primer.

If the slab finish means that the edges will be visible after finishing, it is recommended that they be filled with cellulose filler and sanded.

There is an opinion that a thick layer of paint is better than a thin one. But it's not right. It is better to apply several thin coats than one thick one. In this case, each subsequent layer should be applied only after the previous one has completely dried.

Oriented Strand Board - Relatively new material, used in construction and finishing of houses inside and outside. It is used for installation of rough and finished floors, wall coverings in rooms, interior partitions and facades. The main advantages of the application are the convenience and high speed of covering large surfaces, as well as strength and durability. OSB sheets are factory impregnated with protective compounds, which significantly reduces the negative consequences of exposure to moisture, chemically aggressive substances, ultraviolet rays and microorganisms.

Such processing is sufficient for transporting and storing the material, but after completion of construction and installation work it is necessary to perform finishing work. The simplest and most affordable type of coating is painting OSB boards. The main advantages are as follows:

additional protection from water, moisture, precipitation;
prevention of deformation, cracking;
protection against delamination under the influence of temperature and sunlight;
ability to hide OSB texture;
low cost compared to other finishing methods.

Selection of materials

When choosing how to paint an OSB board, it is necessary to take into account factors such as operating conditions (inside or outside the house, climate, shading), its material (larch, pine, type of polymer resin), expected loads and impacts on the surface.

1. One of the universal options, suitable for interior and exterior work, is painting with oil compositions (Coloray, Syntilor and others). They have good adhesion to wood and high viscosity, which does not allow them to be absorbed into OSB. Thanks to this, the paintwork forms a persistent protective layer with a service life of up to two years on the facade and about three years in the house.

2. Alkyd enamel, unlike oil paint, is more absorbent. On the one hand, this leads to increased consumption, but on the other hand, to the formation of a higher quality and durable coating. Enamel is suitable for painting outside and inside the house, and does not necessarily require a top layer of varnish, which allows for some savings in finishing. Popular brands of alkyd mixtures: Tikkurila, Enamel, Farbex.

3. Painting with water-based compositions for OSB sheets is used less frequently due to the fact that the latter can swell and deform during the drying process. However, Aqualak is used to treat walls, partitions and floors made of oriented strand boards in the living rooms of a house due to its environmental friendliness, lack of harmful emissions and odor. Famous paint brands: Teknos, Dulux, Sadolin and others.

4. The best option for OSB is painting with solvent-soluble substances. The solvent of such a coating, penetrating inside the slab, reacts with the base of synthetic resins, forming a strong connection. The service life of paintwork is tens of years. Suitable for painting exterior facades of the house, fences, OSB fences and other structures exposed to intense exposure environment. The most famous representatives of this type are Sigma Coatings, International Paint, Sterling.

5. If the texture of the oriented strand board is to be preserved, the finishing can be done using a clear varnish. Eco-friendly scuba tanks are suitable for painting walls and floors inside the house, and solvent-soluble compounds are suitable for painting outside. Colorless coating, in addition to improving the quality of the material, is a bold and modern solution in the design of the interior and facade of the house. Sometimes varnish is applied to an already painted surface to increase its service life.

6. If necessary, paint OSB boards in production premises special electrically conductive zinc-containing mixtures (Zinga), fire-retardant and thermal insulating coatings (International Paint), and materials that enhance the ability to withstand biological and chemical types of aggression can be used. Each of the above types will retain their specifications for the entire service life declared by the manufacturer, provided that the instructions for performing painting work are followed and the OSB is properly prepared.

Preparation instructions

The consumption and quality of paintwork largely depend on how responsibly the contractor approaches the work. The main purpose of pre-treatment of OSB is to increase the adhesive properties of the surface to ensure the most intimate contact with paint compositions. Features of the preparation are as follows:

1. Before painting the OSB board, it must be thoroughly sanded over the entire area. This will allow you to remove the top layer of factory protective impregnation, which reduces the degree of OSB adhesion (primarily this applies to moisture-resistant OSB-3, coated with wax). In addition, primary grouting will reduce the relief and texture of the chips;

2. processing is carried out with sandpaper manually or using a grinding machine, depending on the size of the surface to be painted;

3. in order to achieve maximum efficiency, it is better to grind the slabs before their installation;

4. After fixing the OSB sheets, all irregularities, chips and fastening points should be smoothed out with wood putty. The best option for this are adhesive oil compositions;

5. the gaps provided by the technology of joining the plates are filled with sealant or closed with special strips;

6. after the drying process is completed, the entire surface is cleaned again with fine sandpaper or sandpaper;

7. Alkyd varnishes and special adhesive acrylic and polyurethane compounds are used as primers. Painting is carried out in 1-2 layers depending on the absorption of OSB;

8. After complete drying, the material is ready to apply the topcoat.

Painting works

Inside the house, prepared OSB can be painted with a roller or spray (for large areas) and with brushes (for finishing hard-to-reach places, ends and edges). When applying the first (base) layer, you need to ensure that the composition is evenly distributed over the surface. When using a water-based varnish, you must also ensure that the slabs do not become deformed. Strokes are made in one direction.

Before applying each subsequent layer, you need to take a technological break sufficient for the previous one to dry (from two to eight hours, depending on the type of paintwork). The drying process must take place at a constant temperature and without drafts. Scuba tanks designed for indoor work do not have a strong odor and allow painting in enclosed spaces.

Features of external painting

Due to the fact that the material used to decorate the outside of the house is more susceptible to adverse factors, more stringent requirements are imposed on the preparation and application of paint. The most vulnerable parts of OSB are the ends, so maximum attention must be paid to their processing, as well as filling the gaps between the sheets on the facade of the house. All sharp edges of the edges of the slabs are rounded with a radius of 3-5 mm, and then sanded and primed.

When choosing the type of finishing coating, you need to take into account the fact that transparent varnishes, despite their good aesthetic properties, are more susceptible to decay under the influence of sunlight. It is also undesirable to use water-soluble compounds for exterior finishing OSB due to possible deformation of the latter.

Alkyd, solvent-soluble and oil-based options are considered optimal for painting. You can paint the slab outside the room using the same technology as when doing work inside, but the number of layers is at least 2-3, depending on the specific conditions.

Many people have a question: how to paint OSB indoors. When renovating houses, they often use relatively new facing material- OSB. According to English transliteration, the designation can be OCB or OSB. Painting is almost the only finishing method for this material. It does not present any special difficulties and is not very expensive.

What is this material

OSB boards are oriented strand boards. It is made from wood chips, which are glued together using resins, glue and various polymers. The most commonly used wood chips are aspen or pine. The finished composite is protected from moisture by impregnation with water-repellent agents or painting. All OSB can be divided into categories with the following designations:

OSB-1;
OSB-2;
OSB-3;
OSB-4.

How are they different from each other? OSB-1 is intended for finishing interior spaces, in which the minimum percentage of humidity. The boards themselves contain almost no moisture-proofing components. In rooms where normal humidity is maintained, it is recommended to use OSB-2. It is better to finish the floors and walls using OSB-3, especially in places with a risk of getting wet and with a high level of humidity. OSB-4 is the most durable type of material with high moisture resistance. These slabs can be used to construct load-bearing structures. In interior decoration, OSB-2 and OSB-3 are mainly used.

Coloring and its advantages

Painting OSB has the following advantages:

paint protects the material from moisture;
hides the OSB texture;
prevents cracking and deformation of products;
It is simple and inexpensive.

The layer of applied paint does not allow moisture to penetrate into the thickness of the finished material. Without moisture, the slab does not warp. The chips used to make the slab are quite large. You can hide them with dyes. This is much cheaper and easier to do than using decorative panels. But the painting method can only be used indoors. After painting the OSB surfaces, they are varnished. The varnish protects the paint from fading.

For quality work you need to select good colors and varnishes. The best of them consist of organosoluble pigments. Such compositions are able to penetrate inside the panel. Oil paint is considered the best option. It creates a reliable protective layer on the surface. But you can use oil compositions only when there is no need to rush, since it takes quite a long time to dry. An alternative option is alkyd enamel. It penetrates deeply into the slab and creates a strong and durable coating. This coating does not need to be varnished.

You can treat the slabs with Valtti Color Satin impregnations produced by Tikkurila, if there is no need to hide the texture. These products can create a matte or semi-gloss film on the surface.

There are fire-retardant paints Polistil, Ognelat and some others. They cannot be used to protect OSB panels, since they are intended for metal. The best protection against fire are antipyretics Vuprotek, SPAS and others intended for wood.

The quality of painting work largely depends on the preparation of surfaces for finishing. For preparation and painting itself, it is necessary to use special tools and materials:

brushes;
rollers;
putty knife;
spray gun;
compositions for painting;
putty;
sealant;
sandpaper.

If possible, painting is done before installing the slabs. Their surface needs to be sanded, especially OSB-3. All irregularities and places where screws are screwed in are smoothed out using putty based on oil and glue. The seams between the plates are hidden with the same putty or sealant. But experienced craftsmen advise hiding them with decorative strips. Then the slab is primed with Aqua-Filler varnish. Other varnishes can be used. After this, all surfaces can be painted.

The paint is applied with a brush along the perimeter of the surface. Then take the roller in your hands and apply a full layer of dye. After 8 hours you can apply the next coat of paint. The strokes of this layer are applied across the previously applied ones.

Using the described scheme, you can give OSB products an original appearance. Various wallpapers and other means are suitable for finishing.

Conclusion on the topic

OSB (OSV) is used when installing floors, for covering walls and constructing partitions. The easiest way to protect these slabs is to paint them. You can use Coloray and Syntilor paints for this. They hold up well for 3 years. Alkyd enamels Tikkurila, Farbex and Enamel work well. Less commonly used are Teknos, Sadolin and Dulux, which are water-based. When performing painting work, brushes, rollers and sprayers are used.

To extend the life of paint coatings, they can be varnished.

OSB floors can be covered with carpet, tiles, and laminate. Wallpaper is glued to the partitions.

Advantage of dyeing

The main advantage of this treatment of OSB panels is that the painted material will not have its own texture.

In addition to the fact that painting is a very simple process, it also has other advantages that appear when used for OSB processing:

In addition to the decorative function of the paint applied to the rough element, it also protects it from moisture, creating a waterproofing layer. Due to the impossibility of water penetration onto the slab itself, this makes it impossible for it to deform.
Due to the lack of attractive properties of such slabs appearance, painting them allows you to hide irregularities quite well.

Expert advice: The use of OSB boards is recommended when finishing the interior of a room, since it is highly susceptible to moisture.

Speaking of painting OSB boards, it is best to use pigments for this. The reason is that, dissolving in organic matter, they will create a very strong coating layer on the slab, due to which they can last for a long time.

At the same time, the need to update the finish will arise only once every ten years. Despite the fact that they are often used for facade work, they are also excellent for treating interior spaces.

Oil solutions are also considered a popular option for painting slabs. Due to their properties, they have excellent adhesion to wood. At the same time, due to its good viscosity, the material is not strongly absorbed into the coating, thereby leaving a good protective layer on the surface.

The average service life of such options is up to 5 years, without the need for renewal. And although such paints are considered to be outdated options, they can be used to treat the surface without any problems.

You can also use alkyd enamels to finish the surface. However, due to their ability to be more strongly absorbed into wood, much more such mixtures will be needed to finish the same area.

The fact is that due to the absorption of moisture by the material, the consumption of such a dye increases. But their significant advantage is that there is no need to apply a layer of varnish to them after painting.

Note: usage water-based paints is extremely undesirable for processing OSB panels. The reason is that wood material will be heavily saturated with such a solution and, as a result, may swell greatly and also become deformed. This in turn will lead to the need to replace such slabs.

Preparatory work

In order for the paint to adhere better, it is necessary to clean the surface from uneven areas, apply putty to it, and then begin painting

First of all, it is necessary to first prepare the surface of the slabs for further painting. To do this, you need to sand them using sandpaper or special sanding machines.

If there are any unevenness, flaws on the surface, or the heads of the self-tapping screws used for fastening OSB simply stand out, it is necessary to apply putty. After it is completely dry, cleaning is carried out.

Plastering such material will not work; the mixture simply will not stick.

Please note: Before applying putty, it is necessary that the surface is as smooth as possible.

After this, a primer is applied using water-based varnish. It must be diluted in a consistency of 1 to 10, coat the material, and then wait for it to dry. In addition, it is possible to purchase an adhesive primer, which creates an insulating layer between the OSB surface and the applied paint.

Dyeing process

The dyeing process itself is quite simple, if not trivial.

To do this, you just need to know and follow a certain sequence of actions:

first of all, using a brush, you need to paint the entire area of the slab, without sparing the material on the edges;
Next, using a roller, you need to evenly distribute the paint;
all actions should be carried out exclusively in one direction (if you start applying paint with movements up and down or left and right, then you need to try to follow the direction), and you need to apply a not very thick layer;
Now you need to leave the surface to dry for at least 8 hours and apply a second layer in the same way.

Note: How many layers you will have in total depends on what kind of result you want to get.

If it is necessary to paint OSB from the street, it is recommended to choose those mixtures that are intended for external treatment of wood.

In this case, it will be very important to prime the surface well and create a good layer of paint to protect the material from moisture.

If you follow all the tips listed above and adhere to technology, the registration process will be very simple and fast. Don’t be afraid to take on work that you haven’t done before with your own hands. In addition, visual aids can be viewed on videos on the Internet.

Watch the video in which a specialist explains how to properly apply paints and varnishes to an OSB board: (OSB) consist of a composite material made from crushed wood chips glued together with various resins, adhesives and polymers. To protect OSB board

to remove moisture, it is impregnated with a composition that repels water or painted. OSB boards come in different chemical composition

impregnations, fillers and protective coatings, so they come in 4 types:
OSB – 1 – withstands minimal humidity in dry rooms, since there is practically no moisture-proof component in the boards;
OSB – 2 – withstands average indoor humidity;
OSB – 3 – withstands high background humidity indoors and accidental wetting;

OSB – 4 – can withstand high humidity inside and outside buildings.

Why do you need to paint slabs?

Coating OSB boards with paints and varnishes has its advantages:
Paint or varnish provides additional protection against moisture. Water will not be able to penetrate the structure of the slab - deformation will not occur inside and on the surface of the OSB.
Modern paints mask the texture of the slabs, so large chips are almost invisible. Painting is not as labor-intensive as sheathing with decorative panels

and costs less. It is important to know.

OSB is painted and then varnished only for interior work. From the outside, the slabs are protected using more serious methods due to significant climatic influences.

Which paint to choose for interior work?

You can paint with any material, taking into account its characteristics. Since they are glued together with resins and polymers, it is better to use solvent-soluble pigments for painting for maximum adhesion of the paint and the board when the pigments penetrate into the panel structure:
Coating with alkyd enamels or special alkyd paints for wood panels guarantees long service life due to deep penetration into the structure of the material. In this case, you can refuse to apply varnish on top of the paint. This allows you to reduce finishing costs.
You can use an acrylic water-dispersed composition, but then the slab may swell from exposure to the liquid.

If there is no need to cover the texture, then use impregnations, for example, Valtti Color Satin from Tikkurila. These products create a tonic protective film with a semi-gloss or matte texture.

Zinga electrically conductive metallic paint can be used for decorative purposes, provided the substrate is carefully prepared. To protect the panels from fire, use antipyretics developed for wooden coverings: Vuprotek, SPAS and their analogues.

How to prepare the surface of the slabs for painting?

The better the sheets are prepared, the better the adhesion of the paint or varnish to the base and the more durable the protective layer. There is no point in painting OSB panels before installation, since already installed sheathing is often touched up due to fitting, sanding, etc.

Using a special tool, pre-processing is performed in the following sequence:

Grinding

Sandpaper is used to thoroughly sand the OSB board to mask the recognizable texture and prevent primer and paint from penetrating into it.

and costs less. OSB-3 boards should be sanded deeply and thoroughly to remove the outer wax-varnish coating.

Alignment

Get rid of irregularities and dimples in places where screws are attached using oil-adhesive putty mixtures. You should not fill the recesses between the slabs with the mixture; the seams will still appear after painting. Decorative strips will work better. A perfectly smooth surface is obtained after sanding dried putty.

Primer

The easiest way to prime an OSB board is to coat it with a mixture of acrylic or acrylic-polyurethane water-based wood varnish in a ratio of 1:10. Apply thoroughly to ensure even coverage. An alternative is alkyd varnish diluted with white spirit rather than water.

Adhesive primers in the form of Aqua-Filler and its analogues can thoroughly isolate slabs from layers of paint. They will not allow essential oils to escape from the structure of the slab, and stains under the light pigment of the paint will not be visible.

Paint application and drying

The work is carried out in the following sequence:

The primed surface is painted around the perimeter with a brush, 2-3 layers of material are applied to the edges - it will quickly be absorbed. Next, use a roller to evenly distribute the composition over the fibers of the slab;
apply the composition with a roller in a thin layer on the unsanded side of the slab, laying the paint in one direction;
OSB panels are thoroughly dried, avoiding drafts and sudden changes in temperature;
after 8 hours, apply a second layer, maintaining or hiding the texture.

and costs less. When coating with water-dispersed compositions, it is necessary to distribute them over the surface in equal quantities. Since the OSB board will swell anyway, this will happen evenly over the entire surface.

Exterior paint

The outside of OSB can be painted with alkyd, acrylic, oil and latex paints. OSB trims the façade and installs it internal partitions and floor covering. For the finishing coating, paints are used as the most accessible and inexpensive method of decorative cladding.

Alkyd paint

It contains a resin welded from a mixture of acids and vegetable oil. A thin but durable film will protect the surface from moisture after the alkyd paint has dried.

Pros:

low cost of paint;
a moisture-proofing layer is created;
tolerates direct sunlight and frost up to 30°C;
dries quickly;
no toxicity.

Minuses:

the paint is prone to fire, does not tolerate alkaline exposure, and smells unpleasant when applied and dries.

Advice: The alkyd composition should be applied to the surface of the OSB after thorough drying to avoid the appearance of peeling and bubbles.

Water-based paint

It is especially popular. It consists of water and acrylics - binding elements. When dry, the water evaporates and the protection from a reliable polymer layer remains.

Pros:

easy to use;
There are all kinds of colors;
is inexpensive;
is resistant to moisture and sudden temperature changes;
high fire resistance;
is environmentally friendly;
no unpleasant odors;
service life – up to 10 years.

Adviсe:

do not store water-based paint in the cold, do not pour water into the jar, as it will render the paint composition unusable;
metallic paints (Polistil) are fireproof. In the event of a fire, they can release coked foam to stop further spread of fire.

Oil paints

Drying oil-based products are used less frequently due to toxicity, smudges during application, long drying time and fragility - it quickly crumbles and peels.

Latex paint

It is a type of water-emulsion with a binder - latex. The paint is characterized by elasticity and high strength to mechanical influences, moisture insulation, resistance to atmospheric influences, and household chemicals. Environmentally safe, no unpleasant odors.