The technology of frame housing construction allows you to build comfortable housing quickly and inexpensively. The outer walls of such a building are sheathed 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 facing the house, which leads to a rise in the cost of construction.
Facade of OSB boards
Manufacturers of paints and varnishes have taken into account the need of developers to finish OSB boards and offer their own options for solving this issue. The masters who know how to create masterpieces from any material did not stand aside.
Thanks to these craftsmen, creative solutions have appeared for the exterior decoration of a frame house.
Methods of decorative coating of OSB panels
Production of OSB boards
Oriented strand boards (OSB) consist of several layers of chips and shavings pressed together 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 flexural strength and allows the fastener to be held securely. 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 an effective texture. The disadvantage is the need for additional processing of the plate 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 the construction of frame houses, OSB-3 is most often used, since they are cheaper and have all the necessary characteristics for the construction of walls. However, the surface of the OSB-3 slabs needs to be improved.
OSB - oriented strand board
Since this material is most popular with developers, all the finishing methods proposed below take into account the surface features of these panels and can be applied to products of other brands: OSB-1 and OSB-2.
OSB (oriented strand board)
Choosing a method of painting OSB boards
Painting is the most inexpensive way to add aesthetic appeal to the panels. Many developers like the texture of the slabs that they would like to preserve. Irregularities in the surface of the panels when exposed to sunlight create a certain play of light and shadow.It is this effect that is most attractive in untreated OSB.
In order to preserve and strengthen it, use transparent paint with an ultraviolet filter.
For example, Cetol Filter 7 Plus. This compound is intended for exterior wood finishing and is made on the basis of alkyd resins. The coating is transparent and semi-matte. The composition of the paint includes UV stabilizer and water repellents, which provide reliable protection of wood from environmental influences.
Cetol Filter 7 Plus
If there is a need to preserve the natural texture of the boards, the following materials can be used:
Glazes are the most effective, as they have the ability to emphasize the pattern of wood and give the painted surface a stylish shade and silky shine. A wide selection of these formulations is offered by the manufacturer BELINKA, whose assortment includes the Toplazur line, which includes 66 colors and shades.
Transparent varnishes for wood will give the surface of the slab a gloss. Oil, water, or organic formulations can be used. Acrylic varnish will reliably protect the wood, and the yacht varnish will give it a beautiful shade.
Inexpensive and practical solution - semi-matt transparent "Drevolak", intended for covering untreated wood and bricks. This composition is easily applied to OSB and fills in all its irregularities.
Drevolak - water-based acrylic varnish for wood protection
To emphasize the texture of OSB, you can use a stain. To obtain the desired shade, it is diluted either with water, or with a solvent or acetone.
Shades of wood stains
The technique of staining OSB with a stain is as follows:
Tools for applying wood stain
In the photo - OSB board decorated with stain
To obtain the effect of artificial aging, a patina of the desired color is used. After it dries, the plate is sanded with a soft foam sponge, which removes the remaining patina. Then the patinated panel is covered with transparent varnish.
Gold patina paint for wood
In order to completely hide the protrusions of the shavings, use dense covering enamels and water-soluble paints.The choice is wide:
Oil paint for wood
Oil paints have the highest viscosity. Their advantage is that they are practically not absorbed into the slab. Therefore, paint consumption is relatively low. The disadvantage of these compositions is considered a long drying time. But they have the main advantage: a strong covering layer and good adhesion to the surface, which is important when painting OSB.
However, oil paints are not recommended for outdoor use due to their instability to moisture and ultraviolet radiation.
Tikkurila. Oil paint TEHO
Alkyd paints meet all the 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 under the influence of sunlight. Alkyd enamels are able to withstand significant temperature changes, therefore they are recommended for use in regions with any climate.
Assortment of alkyd coatings
Silicone paints are one of the most expensive. This is the main reason for their low popularity. This is despite the fact that silicone enamels fully meet all the requirements of facade work. These paints have good resistance to mechanical stress, crack resistance and moisture repellency. These compositions can be applied to an OSB board that has already been painted or whitewashed.
Facade silicone paint
Latex paints are highly moisture resistant, so they are the best choice for regions with marine 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 are able to withstand a significant number of freeze-thaw cycles.
Latex water-based paint
The optimal choice for OSB painting 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 under 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 acrylic paint Ceresit CT 42
Facade acrylic paints
The OSB slab burns with the release of corrosive substances, including toxic hydrocyanic acid. In the event of a fire, it is smoke that is the decisive factor in survival. Using Soppka paints, you can solve two important tasks at once: paint the panel and increase its resistance to fire several times.
Soppka - experts in OSB protection
Soppka compounds and paints are designed specifically for finishing oriented strand boards, so the manufacturer has taken into account all features of the surfaces of this material. The company's products have excellent adhesion to OSB, which cannot be said about other flame retardants. The service life of Soppka coatings is over 15 years. Paints are able to withstand any environmental influences.
OSB can be painted with any high-quality facade paint intended for fire protection of wood surfaces.
Good reviews of "Valtti Color Satin" from "Tikurilla". This enamel has excellent covering ability, does not change its color under the influence of sunlight, prevents wood decay, has a noble matte shade.
Valtti Color Satin
Tikkurila Vallty Color Satin
If it is decided to give the OSB surface ideal smoothness, additional processing will be required, including grinding, priming, impregnation with an antiseptic. All these points have many nuances that you need to know about in order to get the desired result. Therefore, it is better to consider staining OSB boards on specific examples of the use of various finishing options for these panels.
OSB requires preparation before painting
Before the preparation of oriented strand panels is performed by staining. First of all, they must be primed. This is not as easy a task as it might seem at first glance. The fact is that the front surface of the new slabs is smooth and rather 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 start filling or painting them.
Panels that have stood outside for some time lose the smoothness of their front side. The surface becomes rough and able to absorb the primer. The composition is applied with a roller on a long handle. The optimal choice is the "Ceresit CT17" primer, the quality of which has been tested by time.
Primer CT 17
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 the selected composition. If you need a budget solution for finishing the facade, you can ignore these small disadvantages.
But if you intend to carry out all the work with the highest possible quality, you need to adhere to the following technique:
If elastic paints are selected (eg Descartes or Emarka), the filler step can be skipped. These paints will perfectly fit the mesh and cover it.
After applying the second layer, OSB will acquire a smooth glossy surface.
This method of processing OSB panels allows you to maintain the surface texture while smoothing the most noticeable chip protrusions. Ultimately, a smooth slab is obtained, on which its natural pattern is clearly visible. With the help of multilayer dyeing with compositions of different color and purpose, they provide two stylish effects at once: color dyeing and artificial aging.
Tools and materials that will be required to complete the work.
Abrasive sponge fine grain Р 280-Р320
Primer FL-M042 / C02 Renner
Sanding the panel.
Carry out smoothing of irregularities in the surface of the panel using a grinder and a grinding wheel P180. To obtain the desired result, work with light pressure of the tool. The panels are passed over each section with an abrasive wheel no more than three times.
Applying the first layer of primer.
OSB boards are made using a special glue impregnation, which includes various resins, wax and paraffin. These substances are necessary to prevent the panel from delamination and the formation of rot and mold in it.
Primer for OSB
The primer of the sanded OSB surface is needed so that the resins and paraffin remain inside the slab in the future. At this stage of the work, FI M194 barrier primer is used.
It is applied with an airbrush or spray gun. Material consumption in the range of 50-60 g / m2. Further work begins in 1.5-2 hours, after the soil has completely dried.
Application of pigment primer.
At this stage of work, cover the panel with FL M042 / CO2 primer. This is a white matte composition that dries up in 2.5-3 hours. The soil consumption must be at least 100 g / m2.
Step 4. Grinding the board.
Use a grinder with an abrasive wheel P320. Only the top layer of the pigment soil is removed. You should get a smooth, whitish matte surface.
Step 5. Varnishing the board.
Acrylic lacquer "Mother of Pearl" JW M120 is applied to 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 should be covered with 2-3 layers of varnish. After that, the coating is completely dry for an hour.
Step 6. Patination.
At this stage of the work, the black patina of 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.
The panel should not have any gaps from the previous white layer. Patina dries within 5-7 minutes.
Patina for wood Renner GM M048 / C01
Step 7. Sanding on the patina.
With light pressure, sand the panel with an abrasive sponge P320.
After such processing, a surface with a clear chip pattern should be obtained, the main part of which is white, and the gaps between the chips are black. This provides the effect of artificial aging.
Remove excess patina with a sponge
Step 8. Tinting the OSB board.
Tinting is the stage as a result of which the board acquires color.
To accomplish this task, acrylic varnish is used. The color is chosen depending on how they want to see the facade of their house. Varnish consumption within the range of 100-120 g / m2. Drying time according to the manufacturer's instructions, but on average, 1.5-2 hours.
It should be noted that in the process of drying the varnish, its color will change due to the gradual acquisition of dullness. This example uses JO 00M294 Zero Gloss. If you want to give the facade of your house a gloss, you can opt for compositions that provide this effect.
Example of applying varnish with a brush
This The method of painting oriented strand boards was developed by Holzer specifically for the facades of frame buildings. Therefore, in the instructions offered by the manufacturer, only his products are used.
Tools and materials required for work.
Holzer Festspachtel Elastisch putty
If you wish, you can use narrow decorative panels, with the help of which the facade is decorated in the "half-timbered" style.
Example of finishing
Instead of plastic panels, thin wooden blocks, pretreated with an antiseptic and painted in a color harmonizing with the facade finish, can be attached.
Step 1. Putting the joints between the OSB boards.
Holzer Festspachtel Elastisch putty is applied to the seams between OSB boards.With a spatula, press the composition into the gaps and embroider the putty at a distance of 5-7 cm from the seams. They strive to smooth the composition in such a way that a flat surface without visible gaps is obtained. The composition is expected to harden.
Painting the panel.
Use a roller to apply Holzer color primer to the board.
The primer dries in about 6 hours
You can choose any color from the manufacturer's catalog (there are more than 7 thousand colors in the range). If a fur roller is used, 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 the roller will be rolled, removing excess paint from its coat.
Holzer paints have good hiding power, therefore, for smooth surfaces, a double coat is not required. But in the case of OSB, it will be necessary to qualitatively paint over all the protrusions and grooves. 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 the facades.
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