OSB boards for outdoor use. Finishing OSB - everything you need to know about this material and the specifics of working with it How to cover an osb plate on the street

Oriented strand boards, although they have an interesting pressed wood chip pattern, should not be left uncoated. This is especially true of OSB on the facade of the building, where the panels are exposed to all winds, rains and suffer from other surprises of changeable weather.

OSB needs to be protected from:

1. Moisture. Although water-resistant grade 3 or 4 OSB boards are used for facade work, if they are not covered with a protective material on the outside, after a while they will be saturated with moisture from the soil and the atmosphere and begin to swell.

2. Temperature fluctuations and sunlight over time can also damage OSB boards. In addition to darkening the wood filler, the case may result in the destruction of the resinous binder and flaking of the surface. True, such serious damage is more inherent in low-quality panels. Most importantly, oriented strand sheets are classified as highly combustible materials (group G4) and need to be protected from fire from the outside and inside.

OSB sheathing

Here the choice is the richest: clinker tiles, hinged bricks, wall paneling, siding - the list could go on and on. But why do developers use OSB on the facade? To make construction cheaper. It is with this attitude that you need to approach the selection of finishes.

1. Vinyl or acrylic siding- an economical material that is suitable for any facade. You can pick up panels that look like a block house or brickwork.

The plus is that if the facade of the house is sheathed with OSB, it is not necessary to mount the crate on a flat plane. But what you can’t do without is a windproof waterproof membrane, otherwise the siding “sweating” from the inside will cause the surface of the plates to swell.

Polymer facing products are produced with a thickness of 0.8 to 1.2 mm, but the larger this indicator, the longer they will last. Both types have good strength characteristics, are resistant to chemicals and do not support the spread of fire. Siding easily tolerates heating up to + 85-88 ° C and, subject to the production technology, does not fade in the sun. Acrylic panels behave slightly better than PVC, but they have no serious differences. Price - from 240 to 1210 rubles / m 2.

2. Decorative stone - such a cladding will make it possible to turn an OSB building into a solid brick or stone house, at least in appearance.

The process of finishing the OSB facade is quite complicated and costly, but the durability and ease of repair will pay off these costs in the future. To prepare the plates, you will need frost-resistant silicone-based sealants and antiseptic primers. On top of the panels, you will have to fix polystyrene foam, putty it, and cover it with reinforcing fiberglass on top and glue decorative items.

Artificial stone is made from Portland cement, which provides it with a high strength grade (from 150 and above). In addition, such lining withstands more than 100 freezing cycles, has a water absorption rate of 4-9%, which can be improved with a hydrophobic coating. Price - from 750 to 1450 rubles / m 2.

Plate finishing

1. Plaster.

With the right choice of plaster composition, it will extend the life of the particle board for many years and help make its surface more fire resistant from the outside. The consumption of facade plaster on a flat OSB plane will be minimal, but the associated costs will completely “eat up” the money saved.

The panels will need to be isolated from the moisture contained in the mixture (ideally covered with polystyrene foam) and reinforced with a special mesh. Finishing is best done with textured acrylic-based decorative plaster. It is elastic so as not to crack at the joints of the plates. Silicone is more expensive, but it has greater frost resistance, which is quite important in our latitudes, and the highest strength indicators. The cost of acrylic plaster based on 1 m 2 - 137-320 rubles, silicone - 425-1010.

2. Varnishes and paints for OSB facades.

Paints and varnishes are the cheapest type of facade finish for OSB. Suitable water-based or oil paints on wood marked "for outdoor use." It is undesirable to use water-soluble coatings for OSB, as they will lead to uneven swelling of the surface layer.

But the OSB staining technology will need to be observed clearly:

Fill the interpanel seams with acrylic sealant.
Thoroughly clean and prime the surface of the plates.
When applying primer and paint, pay special attention to the ends, as they are the most vulnerable point of the sheet material.
OSB edges must be painted until all sharp corners are visible.

Oil paint is an ideal option for particle boards on the facade, but here you have to take into account that it needs to be updated every 2-3 years - it will lose its original color so quickly. saturated color. Consumption when covering the base with a primer does not exceed 200 g/m 2 . At a cost of 80 to 540 rubles / kg, finishing the facade in any case will be inexpensive.

Acrylic paint has a high resistance to abrasion - up to 5000 cycles for Ceresit - while it is elastic and does not crack. Consumption is 3-4 m 2 / l, but most of these products can be diluted with water (up to 10% of the total volume). The price varies from 57 to 285 rubles / l.

Acrylic varnishes, with their water resistance, have such valuable property like the ability to "breathe". Before you cover OSB boards varnished, it should be sanded, if it was not done in production, and degreased. The surface of the panel is primed, then varnish is applied. Transparent will emphasize the chip pattern and give the facade a noble shine, but you can also use tinted varnish in the case when the pattern is not so important.

If the OSB plane seems slippery, it means that waxes or paraffin were used to make it. Before finishing, it is covered with a primer paint with the addition of fine quartz dust (sand) - it will provide better adhesion to the next finishing layer. The varnish dries quite quickly - in just a day, forming a sun-protective and frost-resistant film resistant to abrasion. Consumption for a single-layer application is 8-10 m 2 / l, the price is 149-550 rubles / l.

OSB board is a durable and reliable material for facade cladding, but even for its highest quality brands, resistance to atmospheric phenomena is not high enough. Correctly executed protective coating will help to get rid of this shortcoming. The choice of products is large enough to easily find optimal combination beauty and ultimate value.

Good afternoon!
We are building a frame house, it is sheathed with OSB boards, there is a roof - corrugated board, in winter it will go in this form. During the summer, after several rains, the OSB stratified in some places. Is it possible to cover the walls with a windproof film under the future ventilation facade for the winter and will it not lose its properties by spring? And what material is better to take: Isospan A, AD? The facade will be a blockhouse.

It is possible to cover an unprotected facade with a windproof film, but this will not completely solve the problem of preserving OSB. The fact is that the windproof membrane is designed for the impact of individual drops, which are the result of condensation on the roofing. A good slanting rain, downpour, sleet is beyond her power, the windproof membrane will “cry” from the inside. Undoubtedly, the windscreen will reduce the wetting of the OSB, but it will not completely eliminate it.

Windproof membrane is a good thing when covered with exterior trim

OSB-3 boards, which, most likely, sheathed the frame of your house, can only be called moisture resistant with a stretch. And then we can talk about their resistance to moisture only in relation to chipboard, fiberboard, OSB-1 and OSB-2, which quickly collapse under the influence of water. OSB-3 is not intended to be used as a wall enclosing material without subsequent finishing, unlike, for example, cement-bonded particle boards (DSP). By the way, in Canada and the USA, from where they came to us frame technologies, for decorating decent houses that should stand for a long time, they use waterproof plywood, chipboard is the lot of the poorest.

Manufacturers give such a characteristic as the degree of swelling of the oriented strand board when it is in water for a day. For OSB-3 it is 15%. This is not so little, contrary to the claims of sellers and manufacturers. Of course, on the walls, the particle boards are in a vertical position and are only exposed to slanting rain on one side. However, let's assume that it rains for a week or two, sleet, wet. The low air temperature and the lack of sun do not allow the walls to dry out.

Unprotected from rain OSB sheets properly soaked and swollen. At the same time, they will increase not only in thickness, but also in length and width, albeit not so significantly. As a result, the chipboard panels, rigidly fixed to the frame, will warp. And it’s not a fact that when they dry, they will take their original shape, residual deformations are very likely. In addition, the attachment points will weaken, delamination of the ends may occur (it has already begun for you), and the bonding strength will decrease. Hardly in one season particle boards critical damage will not be dealt, but their service life will be reduced, the overall stability of the frame will decrease, this is a fact.

OSB is not a completely waterproof material; with prolonged exposure to moisture, it inevitably collapses.

In our opinion, the following options are possible for temporary protection of the unfinished facade from precipitation:

Stretch the Isospan A windproof membrane (18 rubles / m2) along the vertical crate, use a bar 4-5 cm thick. The film is rather weak, it is not a fact that it will successfully survive the winter, it will not be torn by winds.
Use Isospan AM (24 rub/m2) or Isospan AS (35 rub/m2). A three-layer windshield is stronger, less water vapor permeable, but three times more waterproof, which means it will get wet less. Under the finish (blockhouse), it could be stretched without a crate, right along the slabs. But in your case, a ventilated gap and a crate are needed. It is necessary to ensure free air flow, the gap should be at the bottom and at the top, under the roof. Option #2 is preferable.
Stretch any vapor-waterproofing material cheaper along the crate in compliance with ventilation: roofing felt, building reinforced vapor barrier, dense plastic film for greenhouses (enough for one season). When cladding the facade, the waterproofing will have to be removed.

While there is no finish, polyethylene film can be used as a temporary protection, with or without reinforcement.

The right decision would still be to tighten up with finances and finish the exterior decoration by autumn, sheathing the facade with a blockhouse along a vertical crate. It will end up being cheaper, because the OSB boards themselves can serve as wind protection if they are neatly fitted. You don't have to spend money on tape.

Correct solution"puff pastry" frame wall. If the OSB boards fit well and the insulation is completely closed, they will also serve as wind insulation. There is no need to spend money on an additional membrane.

In modern construction, oriented strand boards are very widely used. In the English abbreviation, they are designated OSB. Among our masters, they are more commonly called OSB, or, Russifying the original abbreviation, OSB. This does not change the essence - the plates have gained well-deserved popularity due to their technical and operational characteristics, quite affordable price. They are made from large wood chips, which make up at least 90% of the total volume, and binders - formaldehyde resins or polyurethane compounds with paraffin-wax impregnation.

OSB is usually used as structural material. It is generally accepted that they are suitable only for a rough surface that requires subsequent closure with one or another finish. But that's not the case at all. It turns out that OSB surfaces lend themselves perfectly to coloring, and if desired, they can be turned into a real work of design art. Information on how and how to paint OSB during interior decoration of a house or apartment will be given in the proposed article.

OSB boards can be divided according to different criteria. This is the level of moisture resistance and strength, the presence of locking joints, the environmental friendliness of the material, the thickness of the sheets.

According to their physical and technical characteristics, oriented strand boards are divided into four types. Each of them has its own purpose. Therefore, when purchasing building material, it is necessary to take into account the conditions in which they will be used.

OSB-1 do not have high strength and moisture resistance. Therefore, they are usually used as an auxiliary material. Their cost is low, and they are often used, for example, to create temporary formwork. After its dismantling, the used parts will not be a pity to dispose of.
OSB-2 - characterized by sufficiently high strength, but not outstanding moisture resistance. As a structural material, they can only be used for internal works and only in dry rooms. Suitable, for example, for sheathing light partitions in a room.
OSB-3 are products that can be called universal. Plates are applied both in dry rooms, and in the conditions of the increased humidity, including on the street. They sheathe walls, form interfloor ceilings, lay rough and “clean” floors from them under a decorative coating. Often used as a material for continuous lathing under some types of roofing.
OSB-4 - products with high moisture resistance and excellent strength. Therefore, they can be used in various areas of construction, including for the creation of self-supporting loaded structures.

Plates are most often produced in the size of 1250×2500 or 1220×2440 mm. Thickness range - from 6 to 25 mm. There may be other dimensions in length and width - this is worth paying attention to. Sometimes custom sizes allow you to choose best option for a specific coverage area. That is, they make it possible to avoid a large amount of waste when cutting the material.

OSB-plates can be ordinary and tongue-and-groove.

Ordinary OSB sheets have smooth edges. When sheathing surfaces at the joints with them, it is necessary to observe a technological gap of 3 ÷ 5 mm, which will keep the coating intact during the thermal expansion of the material. Such plates must be rigidly fixed to the base using self-tapping screws screwed in with a step of 350 ÷ 400 mm. It is recommended to fasten large OSB sheets not only around the perimeter, but also additionally along the diagonals.

Tongue-and-groove slabs are equipped with a tongue-and-groove joint. This option is more convenient when the slabs are planned to be used as finish coat, including - for further painting. The joints are more accurate, and the gaps between the plates are practically invisible. When fastening OSB sheet piling to a flat base, you do not have to use a lot of self-tapping screws. In addition, the products can be used as a floating cover when mounted on a concrete base.

Another important criterion for choosing OSB boards is the materials used in their manufacture. This parameter is especially important if the plates are purchased for sheathing surfaces inside residential premises.

As a binder for wood chips, formaldehyde resins can be used, which emit in environment toxic fumes. Such materials have formaldehyde emission class E2 and higher, and are unsuitable for internal use.

OSB boards produced according to European standards and labeled "ECO" or "GREEN" are suitable for such an application. The production technology excludes the presence of toxic compounds in the composition of the material. Wood raw materials are pre-treated with paraffin-wax impregnations, and polyurethane resins are used as a binder, after polymerization they become completely harmless to the environment.

The affixed class indicates the level of formaldehyde emission. E1 can be considered acceptable for residential premises, but E0.5 is better. And the best option is the “ECO” sign already mentioned above.

This option is fully suitable for residential premises. And it can be safely used for painting.

But in order to be sure of the "purity" of the material, when choosing it, you must carefully study the markings on the sheets. And this information must be confirmed by a certificate of quality (conformity), presented by the seller at the request of the buyer.

What paint compositions are used for OSB-boards?

Variety of coatings suitable for OSB

For coloring wood and products made on its basis, as a rule, several types of protective and coloring compositions are used:

- dispersed, made on the basis of polyacrylates and their copolymers, which act as film formers. When solidified, they form a sufficiently strong polymer layer on the surface of a wooden plate. This type is used for painting both internal and external surfaces. These are environmentally friendly compounds, they protect wood from moisture and have an affordable price.
Polyurethane paints also create a protective and decorative layer on the plate. This composition is mainly used on internal construction and finishing works Oh.
is highly elastic and resistant to detergents. These compounds are non-toxic and are great for painting interior surfaces.
Alkyd coloring compounds produced on the basis of alkyd resins. The film formed on the OSB surface has a higher strength, in contrast to aqueous solutions. Alkyd paints do not contain toxic substances, they are able to effectively protect the material from moisture and ultraviolet rays, are resistant to fading and dry quickly after application. When stained, the paint emits a pungent odor, so ventilation of the room should be provided.
Oil paints have a thick consistency, therefore they form on the surface pronouncedly thick layer. They are great for applying to the end sides of the boards, as they are able to protect them from moisture absorption. Paints have a specific smell, which disappears for a long time after they are applied. In addition, oil paint, unlike those mentioned above, requires a longer drying time.

In addition to universal paints for all types of wood, there are compositions specifically designed for coloring OSB. They are commonly referred to as primer paint and have the following features:

They are able to create reliable protection of oriented strand boards from external influences of moisture and ultraviolet radiation.
The composition has excellent adhesive properties with the surface of such plates.
High elasticity and vapor permeability are noted.
The density of the layer prevents the natural color of the OSB from showing through.
The paint-primer is produced in the basic white color and can be tinted to the desired shade.
Primer-paint is an environmentally friendly composition. It is made on a water basis with the addition of a special acrylic resin, mineral fillers and antiseptic additives.

The primer can be used as a base coat, or to prepare the surface for the subsequent application of a decorative layer.

Criteria for choosing paint for interior work

When choosing a composition for painting OSB indoors, it is necessary to take into account some factors:

Type of wood chips and type of binders used in the production of oriented strand board.
Decorating method, that is, it is planned to preserve the surface structure of the plate, or make it smoother.
Scope (floors or wall).
Features of the room in which it will be carried out

Paint should be selected based on the following recommendations:

Given that OSB boards are made up of 90% wood raw materials, oil paint will be a universal coating for them. Such compositions of the trade marks "Coloray", "Syntilor" and others are of high quality. They have excellent adhesion, minimal absorbency, and the base on which paints are made (linseed oil) significantly reduces material consumption. Oil paint forms a reliable, durable protective layer on the surface, so it is well suited for painting OSB boards laid on floors.

Alkyd enamels are well suited for painting both walls and floors. They also create a durable, reliable coating. However, the consumption of this type of coloring composition exceeds that of oil.

Water-based paints are not very resistant to moisture. They are well suited for painting walls in dry rooms. These are environmentally friendly compositions, so they are used to decorate the walls of residential premises - children's rooms and bedrooms. The brands Tikkurila, Teknos, Sadolin, etc. are considered to be among the best on the Russian market. By the way, some of the compositions are still given resistance to regular wet cleaning.

For OSB surfaces, especially if they are sheathed in rooms with high humidity, polyurethane paint based on organic solvents. Traditionally, such paints of the International Paint, Sterling and Coatings brands are of high quality. When applying polyurethane compounds to OSB, they create, in combination with the resins that are part of the material, high-strength compounds, which makes the coating durable and wear-resistant.

If it is planned to preserve the original structural pattern of OSB, as well as to improve the quality of the surface, the walls are covered with water-based transparent varnishes.

If OSB is to be installed as a floor finish and a smooth surface is required, an epoxy finish can be used.

The surface can be decorated by giving the composition the desired color or adding certain inclusions to it (sparkles, chips, etc.). Or they retain the natural color and pattern of the plates. And an epoxy composition is applied according to the technology used to create a self-leveling 3D polymer floor.

Bulk polymer floors - a bold decision in interior decoration
The decorativeness of such coatings is generally not limited by anything - it all depends on the imagination of the owners. Self-leveling floors are often built on a concrete base, but a well-prepared stable OSB surface will also be a good base for them. And how the filling is carried out - read in a special article of our portal.

How to paint OSB

Preparatory work

Before painting the plate must be prepared. This is necessary so that the paint fits well and stays on the surface.

If it is planned to sheathe the walls and ceiling with approximate particle boards, then it is easier to carry out the preparatory work even before the installation of the plates on the crate.

Depending on the chosen painting technique, it may be more profitable to do it in advance, before installing the skin. This is due to the fact that some of the decoration methods involve several stages of cleaning and painting.

So, the first step is to clean the entire surface with a manual grinder, on which a sandpaper nozzle is attached.

If it is planned to preserve the textured OSB pattern, then an emery nozzle with a medium-sized grain (approximately P120) is selected for cleaning in order to free the surface from the protective layer of binders. If the slab needs to be leveled to smoothness for continuous painting, then first cleaning is carried out first with coarse (P80), and then fine grain (P200 and above).

After removing the top protective layer, the primer or paint will easily penetrate into the structure of the material.

If OSB-3 or OSB-4 boards are purchased, then their stripping should be carried out most carefully, since they have a more reliable surface varnish coating.

The second step in preparing the plates is masking the seams and caps of the screws. Various means are used. This, for example? can be ready-made parquet on an oil-adhesive basis or special elastic. Sealant or special elastic tape is used.

If the joints and holes from the self-tapping screws need to be completely hidden, preserving the natural color or making it a few tones darker, then sawdust should be added to the putty, which will remain when cutting the sheets. In this case, the gaps must be filled very carefully, without going beyond them. And if necessary, after the putty mass has hardened, the seams are cleaned with a grinder with an emery nozzle.

If the surface is to be smooth and uniformly colored, then an elastic tape is used to mask the seams.

The next step, under a solid monophonic painting, a primer is applied to the plates, which can be used as a polyurethane-acrylic, acrylic or alkyd varnish. The choice of composition depends on the base of the paint, which will cover the surface. When using a water-based varnish as a primer, it must be diluted 1:10 with water.

When choosing an alkyd varnish, "White spirit" is used as a thinner

Other than these options? for preparatory work adhesive primers are used, for example "Aqua Filler". This type of primer is designed to isolate wood from paintwork. Such compositions are particularly well suited for coating boards made from conifers wood, as the primer will prevent resin from seeping through to their surface.

In addition to the primers listed above, for pre-training OSB for coloring can also be used a special primer-paint.

OSB painting

So, OSB boards can be painted in one color, retaining the texture or leveling the surface to smoothness. Such staining is not difficult to perform - it does not differ much from the usual application of paint to any other base.

The painting process will be quick if the plates are properly prepared. However, there are other techniques that can change the plates beyond recognition, reliably hiding the joints and fasteners.

This is how the plate will look if you simply apply paint to it with a roller or brush. This option is unlikely to be suitable for residential premises. Therefore, some home craftsmen and professional finishers are developing and putting into practice more creative options for coloring OSB boards.

There are several available options available.

The first option for decorating OSB

In this case, the floors are finished using multi-layer staining technology. To achieve this effect will require a lot of time and patience.

To paint the floor, you need to prepare several tones of the same color. The work takes place in the following order.

The first thing that is recommended to be done is to draw up a sketch of the future floor design. Moreover, it is desirable to perform it in two versions - in graphic and color. The sketch will clearly show how the finished coating will look like, and will also help in further work.
The slab is completely painted with a primer-paint of the base color. The lightest shade of the selected color should serve as the base. To apply paint, you must use an airbrush. Such application will ensure that the paint gets into all the recesses of the textured surface, while maintaining the surface relief.
To emphasize the depth of the relief, the floors can be lightly cleaned with a grinder.
Now the entire painted surface is divided into fragments in the form of stones or other elements. The markup is carried out with a reference to the drawn up sketch, first with a simple pencil. And then it “rises” with a brush and paint 4 ÷ 5 tones darker than the base color.
In the next step, each fragment of the coating is painted with paint of a different tone, which must be prepared in advance.
Further, each of the fragments is cleaned. At this stage, it is not necessary to process the entire surface; it is possible to clean one or two sides of the stone, simulating its volume.
Then the contours of each of the stones are drawn again.
After drying, the surface is varnished, the basis of which is selected depending on the type of paint.

This color option is only available creative person who knows how to work with paints.

The second option for decorating OSB

If there is no desire to come up with the shape and size of the stones, you can go the other way. Specifically, lay out a coating of small square slabs. Adjacent panels are laid so that the direction of the laid chips is perpendicular to each other.

This option will allow you to create an original textured flooring pattern and well mask the joints between the plates.

If OSB has a color that satisfies the owner of the house, then the coating can simply be coated with several layers of varnish or epoxy, after cleaning the surface. In the case when the shade is not quite satisfied, it can be changed using stain or the technique proposed below.

However, it must be borne in mind that the plates will have to be sawn into separate fragments, the edges of which must be perfectly even. In addition, a similar flooring option will look aesthetically pleasing only on a perfectly flat base.

The third option for decorative painting OSB

This method of staining plates is available to anyone, even an inexperienced master. The main thing in this process is to follow the instructions provided by the professionals.

The photo shows an example of OSB staining, which is used to sheathe the walls inside the house. In this case, two colors of paint were used for decoration. But if desired, more of them can be involved, depending on the desired result.

How the OSB decoration process is carried out in this technique will be presented using the example of small sections of the slab in the instruction table.

To work in this case, the tools used were a "Kremlin HTI" spray gun with a 1.8 mm nozzle, a grinder with emery nozzles with grains of different sizes, and a special sponge with an abrasive surface.

Illustration	Brief description of the operation to be performed
	So the first step is to sand the surface. A grinder is used with an emery nozzle with P180 grit installed on it. The process is carried out without strong pressure, since only the protective layer needs to be removed from the plate.
	Since paraffin or wax, as well as resins are used in the manufacture of OSB, the surface of the board must be covered with a barrier primer. It will delay the appearance of resins and paraffin on the decorated flooring. In this case, barrier soil FI M 194 is used. The soil consumption will be 50÷60 grams per 1 m². The primer is applied with a spray gun. The drying time of this layer is one and a half hours.
	The next step is to apply pigment primer to the entire surface of the plates, which will become the basis for creating colors finishing material. In this case, polyurethane primer is used. white color. The consumption of pigment soil will be 90÷100 grams per 1 m². The time required for the coating to dry under normal conditions is 3÷4 hours.
	When the primer is completely dry, the part must be sanded again by setting it on grinder sandpaper with grit size P320. After grinding, the surface must be well cleaned of dust with a vacuum cleaner.
	To create the effect of a delicate sheen, the next step is to apply the composition "Effect of mother-of-pearl" to the surface. The consumption of the wet applied layer will be 100÷120 grams per 1 m². And then 40 ÷ 60 minutes are given to dry the composition.
	On top of the mother-of-pearl layer, also with the help of an airbrush, a patina paint is sprayed, which will give the effect of “noble aging”. The consumption of this composition is 60-80 grams per 1 m².
	After 5÷7 minutes after spraying the patina, its excess must be removed with an emery sponge (bar) with P320 grain. Then the entire surface must be well cleaned of dust with a vacuum cleaner.
	This photo shows the result of the work done. He is already quite capable of becoming the final option. But if you wish, you can continue decorating.
	The next step is to spray the slab with tinted acrylic lacquer mixed with stain. Instead of stain, a different color composition can be used. The main thing to take into account is that the composition of all solutions used for staining organically combined with each other. In this case, a zero gloss varnish was used. Its consumption will be 80÷100 grams per 1 m². Drying of this layer should take place for one and a half hours.
	As the varnish dries, the color may change somewhat, while its dullness will increase. This factor must be taken into account when drawing up a shade of stain or paint.
	The finish can be matte, glossy or soft touch. "Soft-touch" literally translates as "soft to the touch." This is a special rubber-like elastic matte paint coating. This option is perfect for wall surfaces.

When choosing such a staining technique, great opportunities for creativity open up. It is quite possible to come up with your own options that will please the eye.

As can be seen in the examples shown, in any case, the specific surface structure of oriented strand boards can be “played out” in favor of the overall decorative effect of the coating. That is, OSB staining may well be considered a full-fledged finishing technology.

At the end of the publication, there is a video clip that demonstrates another easy-to-do-it-yourself method for the original painting of the OSB surface.

Video: Original staining methodOSB

OSB (OSB) or OSB-board is an oriented strand board. Due to the strength, which is much higher than that of chipboard, this material is very popular in construction. Sheathing an OSB house with a slab from the outside with your own hands is relatively simple and a budget option.

Scope of OSB and types of plates

In classic chipboard, sawdust is kneaded together with a variety epoxy resin, as a result, they are located randomly in the finished frozen formation. In the OSB-plate, they are guided by vibration not only in layers, but also in the direction of laying, as a result of which the plate receives a much greater fracture strength. In fact, OSB is one of the options for composite materials.

OSB boards differ in the degree of their resistance to high humidity, as well as in strength characteristics: how well they are able to hold a fracture load. There are 4 grades of OSB: from OSB-1 to OSB-4. Each of these types uses its own types of adhesives, which give the appropriate properties to the finished plate.

OSB is used for interior decoration premises, as well as for the outside. It is necessary to use different types of boards according to their moisture resistance. OSB boards are durable and practical, they allow you to create complex facades for subsequent painting or plastering from the outside or wallpapering from the inside.

How to properly fix the OSB to the wall

Most often, OSB is used in the construction of frame structures, where slabs are used as a structural material.

To create an outer wall plane, boards should be used that are not lower in quality than OSB-3. Only such material is sufficiently stable for the humidity of the "outboard" air at any time of the year.

When designing such a building, the following features should be considered:

frame racks should be located exactly 2 times more often than the maximum length of the plates intended for use. Then the panel will be quite rigid;

forming an external wall plane, you first need to attach a windproof membrane to the frame racks, for the role of which a PVC film is suitable;

for the entire depth of the wall (and this is the thickness of wooden racks) in frame-panel houses there is a layer of insulation. So that it does not dampen due to internal moisture, before installing the internal wall surface, a vapor barrier membrane should be attached to the frame racks (also polyethylene film);

after that, OSB can be attached to the frame racks.

Plates should be fastened with self-tapping screws or with nails. It is important that their length is at least 2 times the thickness of the OSB used (they are usually produced from 9 to 12 mm thick). Of course, for the outer surface, you need to choose thicker plates than for the inside.

Sheathing the house with OSB slabs from the outside

OSB boards are widely used for lightweight ventilated facades of brick or concrete houses. In this case, the algorithm is:

initially, markings are made on the wall surface where the U-shaped holders will be attached. They are fastened with screws on dowels;

then a layer of insulation is laid on the surface of the wall with glue. It is best to use mineral wool. At the same time, it is initially necessary to calculate the required length of the U-shaped fasteners so that their holders remain 4-5 cm above the surface of the insulation layer. The ends of the holders must pierce the insulation layer;

then we isolate the surface of the insulation with a moisture-proof membrane, for example, a polyethylene film. This is necessary so that the insulation does not dampen, gaining moisture from the surrounding air;

then wooden guide bars are attached to the holders. This is a crate for OSB panels. It turns out that a gap is formed between the membrane and the OSB boards for the thickness of the guide. It is necessary to ensure ventilation of the internal space. The guides must be made of completely dried wood so that there is no geometric warping in the future.

further, OSB boards are attached to the guides using nails or self-tapping screws.

Decorative finishes

For internal walls OSB boards are ideally even, sufficiently strong and absolutely dry surfaces, ready for further puttying, painting, wallpapering. Also, after puttying, relief plaster can be applied. Then the interior space will look original. This will require less power.

For the outer surface of the walls, such panels also need to be puttied, and then they can be:

paint;

lay out decorative facade panels;

trim with clapboard or siding.

Painting a house with OSB boards

Painting is the cheapest and most practical way to finish walls formed from OSB. There are two options here:

painting without pre-priming. In this case it is better to use acrylic paints or polyurethane varnishes. But you need to remember that the surface texture will definitely show through the pigment layer. If this is unacceptable, then additional processing is required.

priming refers to spackling the surface. OSB is a completely dry material that adheres well to adhesive putty. Then comes the stage of painting, after which the house will look elegant and attractive.

Sheathing OSB boards with siding

One of the options design solutions- OSB wall cladding with siding. But there is one subtlety here: the siding panels do not adhere closely to the OSB surface. They specifically have a figured relief in cross section so that the space formed is ventilated.

Therefore, first you need to take care of OSB waterproofing. best choice here there will be a treatment of OSB boards from the outside with dispersed impregnation, which gives water-repellent properties to any surface. It is possible to place a plastic film on top of the OSB-plate, which will protect the panels from moisture.

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Of course, the importance of water in human life is enormous. Moreover, the value of water is important as economic resource, and it is constantly growing, so scientists say that in the future there may be a shortage of water in any form. As you know, not a single living creature on the planet can live without it, it has not only the value of a food resource, but also hygienic properties. Moisture itself is devoid of nutritional properties, but it is in them, is in every cell of a living being. It is found in feed, in objects, in humans, in grass, and even in building materials such as OSB. However, the impact of water during construction work is enormous and devastating, so you need to prepare for them in advance so that the repair or construction works well.

How does water affect building materials?

It is known that water is a destructive factor that reduces the shelf life of any building material. Thermal resistance, durability, durability depend on it. It is for this reason that designers and architects during the construction of the building are forced to solve a number of issues to protect the building from a source of moisture. How does water get in? Does it affect in all different ways? Precipitation, movements groundwater, melt water, during the condensation of water vapor, which often depends on climate zone. If the area is damp, then humidity does not even need to come up with tricks - it is already in the air. That's why builders have to invent different ways to protect designs.

For example, apply a huge range of waterproofing actions, study the types of soil, lay insulation, apply special seams, foundation blocks, control the partial pressure inside the building.

Moisture and OSB

Particularly popular material today OSB is in a different, more delicate relationship with moisture.

Firstly, its oriented structure, its chip base and the emulsions with which it is processed do not allow it to absorb water. Secondly, in each material there is natural moisture, and osb-3 it is deprived, because in production it underwent deep processing by a press, where it was simply taken out. What is curious is that osb-3 - this is, in its essence, ordinary wood, however, particle board was able to keep everything beneficial features wood and get rid of wood imperfections. The particle board does not need any secondary reinforcement systems, and can handle water on its own.

It's good that the woodworking industry has found a way to produce its materials without waste. Plywood, glued beams, fiberboard are made from waste, but osb boards can be called one of the most popular. I have come across this material more than once in the course of repair work, because osb slab can be used for both walls and floors. However, when I first used the panels in my home, I could not even imagine how important their labeling is and that some panels can be of great harm to human health. All this prompted me to write about the technical characteristics of osb plates, their harmfulness and in what room, perhaps, their use.

The purpose of the plates and their varieties

Before we disassemble the types of panels, let's figure out what is OSB plate? So, osb is a material consisting of three pressed layers. It consists of elongated chips, which are waste from aspen or pine. The strength of the panel lies precisely in the fact that in the middle layer the chips are located at right angles to the upper and lower layers, and in the covering ones, on the contrary, along. All layers withstand the press at high temperatures, and resins and waxes are the binding waterproof impregnations.

Important! The use of floor slabs is widespread, due to the ability to withstand heavy loads. Finishing walls or floors in a room with osb plates is due to the high mechanical strength and elasticity of the material.

There are four types of osb boards. Let's look at each of them:

OSB1 - used for the production of furniture products. Paneling of walls and floors is not welcome due to low density and fear of moisture.
OSB2 - denser than the first type, but also susceptible to moisture. The characteristics of the panels allow their use for cladding in rooms with an average level of humidity.
OSB3 is the most popular type due to its excellent resistance to moisture. Under lasting influence water still begins to deform and if used for outdoor work, then mandatory coloring of the material is required.
OSB4 - has the most best performance and absolutely not afraid of moisture. The casing is not deformed even with prolonged contact with water.

Let's look at a small table and look at the strength and moisture resistance that osb boards have:

Panel characteristics

Where the finishing takes place plays a big role. For outdoor work and for sheathing inside the house, different panels are used. Despite all the characteristics, the most important is osb thickness plates and it depends on this for walls or for flooring material will be used. Invariable in the dimensions of the panel are the length and width.

For convenience, I compiled an osb size table:

The name of indicators	Panels with smooth edges								Tongue-and-groove panels
Length*width, mm	2440x1220, 2500x1250								2440x1220, 2440x590, 2450x590, 2500x1250
Thickness, mm	9	10	11	12	15	16	18	22	15	16	18	22

The technical characteristics of modern osb boards are quite impressive and this property makes them very popular for outdoor work. Let's look at the main properties of the material:

If the thickness of the panel is chosen correctly, then the finish can withstand a load of several centners - this property allows you to lay the material on the floors in a room with high pressure on the surface.
Lightweight and resilient osb panels are used in curved surface cladding
Even with a certain bending, the osb plate remains solid. Plywood, for example, delaminates when bent.
Sawing material is quite simple, because processing with a drill and a saw is possible even with your own hands - this simplifies the process of working with osb and allows you to independently finish the surface of the walls or lay panels on the floor.
Good heat and sound insulation properties are also inherent in this material.
Oriented strand board is not afraid of chemical or mechanical attack
Thanks to the special impregnation of osb plates, mold and fungus are not harmed.

How dangerous is osb material

The use of osb boards for rough finishing inside the house is very popular, but the question is important: are osb panels harmful to health? The answer is obvious: harm to health exists due to human exposure to the emitted vapors, since synthetic resins, or rather formaldehyde, are used in the manufacture of osb boards. If the total percentage of the mass fraction in the product exceeds 10%, then toxic fumes can be released into the environment, which means that the harm becomes obvious.

Despite all the positive characteristics, such a negative point as harm human health becomes a reason to think about whether the use of osb is necessary for roughing or finishing work for walls and floors. It may be hard to believe, but if a person constantly breathes such vapors, this can lead to serious illnesses, in some cases this harm leads a person to oncological diseases.

Unfortunately, not only osb plates can harm others, sometimes the danger from other seemingly safe objects can be much higher than from this material. The point is that many manufacturers various furniture, carpets and other textiles often spit on the norms and save on production, thereby harming all consumers.

Important! If the use of material for work is necessary, then the release of corrosive fumes can be minimized. To begin with, choose only high-quality material - it will cost more, but health is also important! Create stable conditions in the room where the lining of walls, partitions and floors will take place - it must be ventilated, and all places where water leakage is possible must be well primed. Such serious attitude can reduce the risks of diseases and reduce the stay harmful substances in the air to an acceptable level.

Rough flooring

OSB board for decoration

The use of osb slabs for floors is as popular as for walls. The draft floor is necessary for further laying of decorative flooring.

The most optimal for a rough substrate are osb3 boards - their properties are ideal for leveling floors and they are well protected from moisture. Let's look at how the work process for subfloors from osb takes place:

Bars are attached to the logs, in which the cross section is 50 * 50 mm
The next step is to prepare the material.
The side of the slab that is turned to the ground will need to be processed bituminous mastic– you can use other means protecting from high humidity
We fix Osb3 to the logs using mounting glue, self-tapping screws or special nails. The result is a design that resembles a box
It is in it that you need to lay the heat-insulating material, then equip the vapor barrier and close it all with the top layer of osb boards
After that, it is possible to carry out work on the final finishing of the floor.

Interesting! The coloring of the material is the most accessible way design and additional protection of osb from adverse effects. In addition, coloring allows you to hide the texture of the material. Use alkyd and oil paints to obtain a quality finish, especially if the use of boards is necessary for walls or partitions.

Comparison of plywood and OSB
Main characteristics
Acoustics and ecology
Benefits and Features

Many are interested in the question of which is better: plywood or OSB. Plywood, as a material, appeared on the construction market much earlier than OSB. It is rather difficult to compare these two materials, since both of them have a fairly wide range of models.

Comparative table of building materials (maximum score 5 points).

In order to answer which is better, plywood or OSB, it is best to compare moisture-resistant plywood and OSB-3, since they are more or less similar in their properties. OSB boards have a higher cost, although their cost is quite low, and despite the fact that they have almost similar production technology, properties and scope of application with plywood.

Comparison of plywood and OSB

The raw material for the production of OSB boards are chips, and in the case of plywood, veneer. The cost-effectiveness of osb boards is immediately visible, since even wood waste, that is, shavings, can be used for their production. Their technology does not require the use of toxic hazardous substances. Such a plate can also be re-processed, and the production process itself does not have strict standards. Due to this, OSB boards do not have clear dimensions and thickness, which has led to their very wide range in the modern construction market.

The tree from which OSB boards are made is needles, and birch is also used for plywood. At the same time, the OSB board is made three or four layers, and plywood has large quantity layers. But in the first boards it is very important to observe the principle of fiber orientation, when in the second production it is not so significant.

If we compare both boards, then osb has a lower level of formaldehyde than plywood. Despite the fact that these two types of material are quite strong, plywood sheets are still inferior in shear strength. And with the same strength indicators, the OSB board is much lighter than plywood.

A special advantage is that the OSB board is absolutely not afraid of moisture and does not deform at its increased level. When working with such material, there are no particular difficulties. It is easily drilled, cut, milled, turned, easily painted and varnished. If desired, they are easily processed with protective solutions, and it is not difficult to carry out installation with them. The main thing is that all this is easy to do with the help of automatic equipment. But plywood requires careful manual processing.

In addition, insects “prefer” plywood more than OSB. But it should be noted that the plywood slab is more difficult to deform, and the service life does not affect its shrinkage. The best aesthetic appearance of the product is precisely from plywood sheets, but if the OSB board is coated, then it easily becomes one level.

It is very important to note that if one or another product is treated with varnish or special impregnation, then it becomes difficult to argue about the strength of plywood or osb.

What to choose? In order to decide which plywood or OSB is better, you must first understand the characteristics of each material separately.

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Main characteristics

In order to form a complete opinion about this material, you need to consider the following indicators:

biological stability. Plywood layers are glued using glue containing phenol-formaldehyde in its composition. Such a substance well protects the plate from the effects of various fungi and other harmful microorganisms. During production, the ends of plywood boards are laminated, which leads to protection from adverse weather effects, namely, according to this indicator, plywood can be used as a building material for streets. In addition, she is not afraid of direct sunlight, which means that the plates will not lose their color, and cracks will not form on them.

But during operation, it must be remembered that the humidity of the ambient air should not exceed 20%, and in order for the plywood not to rot, it needs oxygen with air with a temperature of 20 to 30 degrees Celsius. If, however, such a board suffers damage to the covering film or lamination, then accordingly it loses the quality of resistance.

To prevent decay, manufacturers impregnate their products with special antifungal solutions. They protect the plywood from the appearance of blue. And additional additives contribute to a longer preservation of color and protect against harmful insects.

Chemical properties. Plywood is a material that can withstand the effects of weak acids, acid-salt solutions and combustible oils. But if a valence solution gets on such a sheet, this will lead to softening and swelling of the wood. The ingress of concentrated acidic substances entails destruction.

Substances such as chlorine, hypochlorite and various nitrates are also undesirable for contact. In order to maintain the strength of the coating, it is not recommended to use acetone, gasoline and alcohol for any purpose, since they, in turn, destroy the wax coating, which means that they reduce the level of strength of the product.

In order for plywood to be more resistant to such influences, its lamination is necessary.

Thermal conductivity. The more moisture in a plywood board, the faster it heats up, because water heats up three times faster than wood. Accordingly, if the level of moisture increases, then the thermal conductivity increases.

If the ambient temperature is about +20 degrees, then even with minor temperature changes, the tree will not lose its properties. But with an increase to 100 degrees, plywood boards lose strength twice. It is worth noting that at sub-zero temperatures such material has even better elasticity and strength, compared to the room range.

Fire resistance. Like any other wood, plywood catches fire easily. The temperature at which it ignites is 270°C. Just like that, the stove will not light up, for this it is necessary that in the heat-affected zone the temperature reaches 400 ° C. In order to have as little harm as possible from burning plywood, such boards in the charring stage slow down the combustion process itself.

To improve the refractory properties, manufacturers are trying to treat their products with various chemical impregnations.

Construction is extremely costly. It will be felt by everyone who started the construction own house Or just a renovation. Significantly reduce costs, will allow osb plate, the demand for which in Russia is increasing every year.

What is this material?

This is one of the varieties of particle boards made by pressing. Unlike the well-known chipboard, OSB material has some features:

In production, especially tight control is exercised over each chip, in contrast to conventional particle boards.
Shaping is done using synthetic resins at high temperature and under pressure.
This manufacturing option makes it possible to obtain a particularly durable material, which is characterized by a small thickness, resistance to mold and fungus (this is especially true for some regions of Russia with a damp climate).
In the production of plates, only high-quality wood is used.

Unlike conventional chipboard, this material is stronger. And thanks to this property, it is used for flooring.

Areas of use of plates

The material is used in the manufacture of containers, the construction of houses and flooring in rooms. It is used in the production of such works as:

Board OSB

The device of a continuous lathing of a pitched roof.
Construction of structural elements in low-rise construction.
Repair work: ceilings, partitions, laying the floor.
Temporary closure of openings during the construction of buildings.
Reinforced concrete and concrete work, as a reusable formwork.
Sheathing frame walls.
Manufacture of pallets and boxes.
Floor and wall paneling in vans and trucks and many others.

Manufacturing technology

The technology for the production of osb boards includes several stages.

Sorting

In the manufacture of osb boards, only thin wood is used. The trunks are sawn to size into individual elements, then the blanks are passed through a machine that processes them into a chip band. After that, the material undergoes a drying procedure in special bins, for which the waste generated during the production of chips is used. After that, the chips are sorted into small and large.

Mixing

The selected material is mixed with a binder. This is necessary to give the product strength. The mixture is then fed into drums, where it is further mixed with paraffin and resin.

Shaping and styling

Class OSB-3

This production process of OSB material takes place in a special installation equipped with pressure rollers, scales and magnets, the latter are necessary to search for foreign metal inclusions in the mixture. At this stage, the chips are oriented in different directions.

Pressing

Here, the chip carpet is compacted, with a gradual increase in temperature to a value of 170–200. The process takes place using steel tapes. They are lubricated with thermal oil and heated in a boiler with a capacity of at least 8 MW.

fine-tuning

As a result of such production, a long web is obtained, moving along a roller table. At this stage, it is checked for compliance geometric characteristics and cut to size. To allow the resin to finally harden, the finished material is kept in warehouses.

Advantages

Every year the demand for this material in Russia is growing, thanks to its following technical characteristics:

Building a house

The uniformity of the structure allows the material not to exfoliate and not crumble.
The layout (orientation) of the chips using a special technology makes the boards resistant to moisture, and allows you to hold nails well in the body of the material. When arranging a floor or partitions, this is especially true.
OSB boards can be fastened together using the tongue-and-groove technology. It's reliable interlock connection used in the construction of frame houses.
Resistant to sudden changes in temperature.
Increased strength with small dimensions and thickness. Structures built from such material are better able to withstand earthquakes.
Harmlessness and environmental friendliness, full compliance with the E1 hygiene class.
Low cost compared to other lumber.

Technical standards

Modern osb products have special characteristics, due to which they are widely used in construction. The main qualities of the material include the following:

Plate 2500x1250x8 mm

High strength. Depending on the thickness of the material, it can withstand a load of several hundred kilograms per square meter.
Lightness and flexibility. This allows it to be used for sheathing curved surfaces.
The homogeneity of the structure of the material ensures its integrity under loads, unlike plywood or chipboard.
Particle boards meet all specifications natural wood, but what distinguishes it is that it is devoid of the disadvantages inherent in wood: fear of moisture, the possibility of cracking and other defects.
Ease of processing, allows you to drill, saw and fasten the material without any problems.
Special additives give OSB board antiseptic qualities, as well as resistance to chemical and mechanical damage.
During operation, such material does not change its shape and size for a long time.

Marking of plates from the manufacturer

On the market building materials mainly the following types of products are presented:

Plaster over slab

OSB 1. The characteristics of this material make it possible to use it in conditions of low humidity and light loads, for example, for laying floors in residential buildings.
OSB 2. Used in the load-bearing structures of the premises. This species is also best not exposed to moisture.
OSB 3 board. This is the most durable material designed for use in harsh conditions. It is resistant to mechanical stress, is not afraid of moisture and has a certain percentage of flexibility. Accordingly, the osb 3 plate is much more expensive than other types.

A little about moisture resistance

Today in Russia the production of moisture-resistant boards has been established.

It cannot be said that the osb 3 plate has such high qualities that it can lie in the pouring rain for some time and nothing will happen to it. But, her specifications encouraging.

Such information is not groundless and is based on the reviews of many owners. country houses built from such material. According to their experience, after 6-7 years no signs of destruction are visible.

Is it really safe

Frame assembly

Hot debates about this have been going on for a long time, since the OSB material appeared on sale in Russia. To many, the term chipboard speaks of a product from the distant times of the former USSR. At that time, their production used a large number of synthetic resins and phenol, so the main problem with having furniture made from such material at home was a respiratory disease.

In the case of OSB material, you should not worry about this. Numerous reviews of those who have used this material for various needs say that no side effects and no foreign smells.

There is still one nuance in the use of oriented chipboards, but it is insignificant, and it is associated with the use of synthetic resins in the production. If you build an attic in your country house, then in the first years of operation, under the influence of the sun, these substances can evaporate and give off a not very pleasant smell. But this is easily corrected by regular ventilation.

Practical use

Construction is a huge controversy. residential buildings from this material, not only in Russia, but also in many neighboring countries. But, as a rule, interest in this topic is artificially heated in order to fill construction forums with posts. And it should be noted that this is not the best option for promoting promising material.

Frost and moisture resistant

The main stream of criticism is that most builders still prefer block construction, and the maximum size of slabs for building houses cannot exceed 1.5 meters.

Given the height of the buildings, at least one connection will have to be made during their construction. But in turn, practitioners are advised to avoid such "junctions". They substantiate this by the fact that a high load will be placed on the extreme plates, and, consequently, the probability of their damage increases significantly. Most Owners country houses from OSB, in particular, and highlight the problem with broken end plates. Agree, this does not add decorative finish to the house.

A little about the cost

Oddly enough, but the production of specialized projects is less expensive. The builders explain this by the fact that with such an order, they calculate the required dimensions, the amount of OSB material, and make up the final estimate, which does not change in any way during the work. For Russia, this is especially important, given the ever-increasing tariffs for building materials. According to reviews, when building according to an individual project, up to 48% of the estimated cost of materials is saved, and when working according to a typical one, up to 80%.

natural wood materials

Of course, given this, many in Russia are trying to save money by doing all the work themselves. And, unfortunately, banal mistakes during construction are made by up to 15% of developers. But those who are familiar with this case can win a little. People who first encountered such material and decided to build a house on their own need to be prepared for various nuances.

If you show the desire, and use the OSB stove to the maximum, then the result will be beautiful and inexpensive, but not a house, but something similar to it. You will not be able to design an individual building, therefore, with an independent approach, mostly the same type of structure is obtained.

As mentioned above, the most beneficial optimization of standard projects for OSB material. Although this is not very welcome in Russia, it is still used by many, thanks to the use of some methods that help to use such material with maximum efficiency.

Standard panels have to be cut and joined, given the usual ceiling height of 2.5 meters (and this over size standard plate). In this case, the panel is more convenient and more profitable to put on a long edge, because it standard width 1250 mm, so you can get by with fewer connections, which are badly spoken about by many. Self-taught builders claim a significant reduction in waste when using this method. In addition, you can use such material to the maximum if you calculate the size of the windows in advance and order panels with already cut window openings.

Floor tiles

floor leveling

One of the directions for using OSB in Russia and other countries is the laying of a rough floor covering for subsequent finishing. Given the specifics of the material and its technical characteristics, almost any material can be laid on top of such a base. There are several recommendations for using OSB boards as a subfloor:

Considering this option for finishing, pay attention to European products, they are of better quality.
If the plates will be laid on the floor screed, then it is better to purchase them with a thickness of no more than 1 cm. And in the case of installation on logs, the material is thicker and stronger.

Conclusion

There are no ideal building materials, so there will always be those who are dissatisfied, and when using any material, sooner or later its negative properties appear. But having considered all the qualities of oriented wood chip products, we can safely say that they are just a godsend for builders. Today in Russia there has been a positive trend in the construction of suburban buildings. And although such material is not used in the construction of multi-storey cottages, it is simply ideal for small houses, which makes it possible for the middle class to have real estate outside the city.

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Ruslan Vasiliev

Oriented strand board (the name of this particular building material is hidden under the abbreviation OSB) is known to consist of wood chips and special resins. The tree in any form is exposed to moisture: it impregnates it, the tree swells and collapses from this.

but different varieties wood (and different products from it) react to moisture in different ways. What happens to the OSB?

If a little rain has fallen or dew has fallen

Of course, the wood chips that make up OSB absorb moisture. Of course, OSB swells.

However, this swelling is insignificant and is fully compensated by a gap of 3 mm during installation.

However, there is no need to relax. If it starts to rain, the stored OSB must be covered.

It is worth working with OSB in light rain only if there is no roof or roofing materials are laid on it. The OSB fixed on the roof must be covered.

Of course, you can use cheap roofing felt or plastic wrap for this purpose. But they are fragile, quickly torn and do not let steam and water through. Wet OSB covered with it feels like a person in a bath - damp and stuffy.

It will be much more effective to use roofing films or membranes produced by Ondulin companies under the Ondutis brand. They can be used as a temporary roof for up to 3 months. During this time, even the most unhurried roofer or the owner who is building a house will mount roofing materials on the roof with their own hands.

Yes, Ondutis films and membranes are more expensive than roofing material. But they cost less than it would cost to repair a roof and replace rotten wood.

Actions in case of dew fall are similar to those described - the stored OSB should be covered, the mounted OSB should be covered for the night. In this case, most of the moisture will remain on the material with which the plate is covered.

If it rained heavily

If during the installation of the OSB it began to rain heavily, the work must be stopped.

Heavy rain will cause the OSB to swell and begin to deform. Together with it, moisture and other elements of the roof structure will accumulate.

Therefore, the most rational would be to cover the roof with protective material and wait for the rain to stop.

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