OSB boards (oriented strand board, OSB) are a popular material used primarily for express finishing of premises, as well as in frame house construction for exterior work. IN construction stores Several brands have been proposed, characterized by different moisture resistance. OSB-1, OSB-2 are used for finishing interiors with normal humidity, OSB-3 and OSB-4 are designed for cladding facades and external structures. The key feature of this building material is natural origin raw materials, high strength and low cost compared to wood.

OSB: production features

The use of OSB boards for external work as facing material determine its characteristics and production features. We are talking about the production of building boards with a multilayer structure; usually 3 or more layers of material are used from small wood waste, glued together using boric acid, synthetic waxes and resins. The most commonly used name in Russian is a direct transcription English translation, the correct abbreviation OSB comes from the name oriented strand board.

The strength of this façade material is comparable to and superior to hard wood. At the same time, the presence of resins and wax in the composition during surface treatment helps to maintain a rigid structure and load-bearing capacity even in a constantly wet state. High hardness is also related to the direction of the chip mass, in different layers The slabs are arranged in different orientations – vertically and horizontally.

Depending on the application, a classification of brands has been introduced:

• OSB-1 – used for the manufacture of non-load-bearing structures used in dry rooms;
• OSB-2 – for load-bearing structures in interior spaces;
• OSB-3 – for load-bearing structures with high humidity, including for facades;
• OSB-4 – for structures bearing increased loads and operating in conditions of high humidity;
• varnished OSB boards - for finishing without additional coating;
• laminated – for concrete formwork;
• tongue and groove - with tongue-and-groove fastening on four sides, mainly for installation indoors (large area floors).

For external cladding of facades, OSB-3 and OSB-4 grades are used, more often OSB-3, as it has a much lower cost. The use of OSB-4 is recommended in structures with small roof overhangs, with systematic wetting of the facade and the absence drainage system(to avoid or minimize wetting, specialized moisture-resistant paints and coatings are additionally used).

Advantages of OSB boards as a facade material

Grades OSB-3 and OSB-4 are an improved version particle board. Short-term resistance to moisture, low vapor and water permeability are qualities characteristic of all types of OSB. Moisture-resistant brands change their dimensional parameters by only 7-10% after being in water for 24 hours. In terms of swelling coefficient, OSB is inferior to cement-bonded particle board, but is much lighter in weight. Does not require labor-intensive installation, can be installed on high-rise structures without additional crane equipment.

Table 1. Strength characteristics (slabs up to 1 cm thick)

To the key benefits of OSB As a façade material, the following qualities apply to cladding:

• moisture resistance with a low swelling coefficient in a damp room;
• easy processing comparable to wood (fastening, painting, gluing);
• holds fasteners 20% better than coniferous plywood;
• has virtually no defects (irregularities and voids);
• not damaged by rodents and insects.

The improved characteristics of the third and fourth grades of OSB are achieved due to the formulation of the adhesive base used. Multilayer construction is made using different types resins:

• external with increased moisture resistance - based on melamine-formaldehyde resin;
• internal - based on urea-formaldehyde resin, in some cases (in case of violation of technology) phenol-formaldehyde;

All resins used have increased toxicity in production and release toxic substances. For this reason, if the origin of building materials is unclear, OSB is used only for external structures. IN street conditions the released concentrations of toxins are insignificant and completely safe for humans and nature.

Geography of production as an indicator of quality

Despite the fairly affordable technology, there are only a few largest manufacturers of OSB boards in the world. The main production facilities are located near large wood processing enterprises: Kronospan (Austria), Norbord (Belgium), Louisiana Pacific (USA), Glunz, Ainsworth (Germany).

A number of large production facilities have been built in China, but the value of raw materials is low, much lower than that of products from the EU countries, the USA and Canada. In addition to using more toxic resins, poplar shavings are used. It is significantly inferior in terms of strength compared to coniferous wood.

In Russia, the first production was launched in 2012 in the city of Kirov, in the Vladimir region (Hilman), the Kalevala DOK is operating, and the Kronospan plant is expected to be put into operation in the Moscow region. Today, there is production of OSB-3 and OSB-4 in the city of Torzhok, and projects have also been announced in Komi, Bashkiria, the Pskov region and Siberia.

The quality of the slabs directly depends on the supplier, the cost - on the region of delivery. Russia is characterized by the deployment of new production lines and the use of chips coniferous species tree. Chinese OSB is not in demand due to unstable parameters. The most popular brand is Kronospan, which guarantees stable quality and environmental safety. Due to its features, OSB is one of the best materials for facade cladding, but if quality is not guaranteed, it is not recommended for use for decoration purposes interior spaces.

Consumer characteristics - weight, thickness, size

Trading companies offer OSB boards in a range of thicknesses and sizes. These products are not standardized and are therefore supplied in acceptable factory sizes. Available assortment and thickness range allows you to choose the most suitable option while managing the budget finishing works. Smaller sheets are suitable for do-it-yourself fastening and cladding; they are supplied by American and European manufacturers. The weight of products with the same thickness and size parameters may vary slightly.

Table 2. Technical Parameters OSB boards from European manufacturers

The NordBord company produces products measuring 2550*590 mm with tongue and groove fastening on 4 sides, used primarily for laying floors. OSB boards are available for purchase individually and in packages; the quantity on a pallet depends on the thickness of the sheet. With a thickness of 10 mm, the package contains 90 pieces.

Table 3. Features of OSB boards made in Europe

Name	Peculiarities
Ecological cleanliness	European-made slabs can be used for interior and exterior finishing, are controlled by the E1 environmental safety standard. A hygiene certificate was received in the Russian Federation.
Moisture resistance	Swelling coefficient: OSB-3 – 10-12%
Deformation	It does not deform, so it can be used for load-bearing structures. The sheets do not have internal stress, such as, for example, remains during the manufacture of plywood.
Biostability	Not damaged by mold, mildew, or insects. Does not require additional processing.
Dimensions and thicknesses	Stable dimensions are ensured thanks to computerization of production.
Joinery processing	Easy sanding, the sheets have no defects, cracks, knots or voids.
Installation requirements	Fastening is done with nails using pneumatic tools, self-tapping screws, and staples.

For external cladding of facades, OSB-3 and OSB-4 with a thickness of 15-25 mm are used. The cladding has low vapor permeability and does not require the installation of a vapor barrier. The spacing of the slabs during installation provides the necessary micro-ventilation.

Independent installation and finishing of OSB sheets on the facade

Installation of OSB is assessed at the technology level as a low-labor job that can be done independently. Without involving assistants, it is recommended to first cut the sheets into several parts and mount them on the wall using a fastening tool.

The next step is painting the OSB. Cladding a house using this type of material can be completed in 7-10 days with a complete finish. OSB sheets are covered with putty, plaster, ordinary and specialized facade paints, including without a pre-applied leveling layer. In some cases, the house is decorated with a contrasting strip in the popular architectural style"half-timbered"

When the building material from which the walls are made is oriented strand board (OSB or OSB boards), the question arises about the finishing method. The lining of the OSB board can be done, or. But the enamel surface is more affordable and easier to implement. It’s worth choosing what to paint OSB plate on the facade of the house, master the technology and you can start finishing.

OSB boards are used for the construction of frame buildings or, so that it is possible. They have good insulation and strength, although this material is not sufficiently moisture resistant. The raw material for the production of OSB is non-working coniferous wood or wood processing waste. OSB facades can be subject to deformation under the influence of water. However, it stands out due to its environmental friendliness, practicality, ease of processing and installation.

Construction experts advise using OSB-4 or OSB-3 boards for cladding the outside of a house, but the second option is considered less preferable. You can sheathe the outside of the house with OSB of the third group, but it does not have special protection from moisture, so it must be additionally processed. OSB-4 is significantly more expensive, so exterior finishing of a house using OSB boards is not done very often when constructing economical buildings.

Since the basis of OSB boards is pressed shavings, OSB can be processed for exterior finishing using any paint compositions that are suitable for wood material. Limitations are determined solely by aesthetic features. In particular, there is no need to choose transparent varnishes or glazes. The chip texture is not endowed with special beauty, so it does not need to be put on public display.

In addition to painting OSB boards, it is also suitable. described in detail in the corresponding article, it will not have any special features if the base is an OSB board. You can perform plastering with or without insulation. Pay attention to the primer, it increases the adhesion of the base, i.e. the plaster composition fits and attaches better. In this article we will talk in detail about how to paint smallpox on the facade.

Which paint to choose?

Before deciding how exactly to paint the OSB board on the outside, you need to select a suitable paint and varnish product. OSB is made of wood, so experts recommend using it. Moreover, it is necessary to select only the one that is intended directly for facade work.

You can consider the most popular types of paints that can be used to cover an OSB slab outdoors:

• Acrylic paint. Best option How to paint an osb board, both in terms of price and service life. Quite an unpretentious paint, it is easy to apply, it is resistant to different climatic conditions. The variety of colors that is created thanks to the colors is considered obvious advantage similar painting option.
• Oil paint. Painting OSB boards oil paint is done in an increasingly less common way due to a significant number of shortcomings. It is quite toxic, retains streaks and takes a long time to dry. The duration of preservation of such a surface leaves much to be desired - under the influence sun rays and over time it is subject to fading and peeling. The cost of such paint is above average.
• Latex paint. This is the most expensive material, but at the same time the most attractive. The latex surface is distinguished by its own density and strength and is reliably protected from impact, scratches and climatic factors. The coating easily stretches during various deformations of the base. Such paint is considered completely impervious to moisture, which is by no means always good. This is explained by the fact that for long-term and normal operation, wooden boards need to “breathe”.
• Alkyd enamel. Main positive aspects This option is favorable cost, resistance to sun rays and low temperature conditions(up to minus thirty degrees). The enamel dries quite quickly (within ten hours). At the same time, enamel is highly flammable and has a pungent and not very pleasant odor.

In order to paint OSB facades, they also use varnish, which is intended for external work. It must contain inhibitors that prevent negative effects ultraviolet rays.

Not everyone is satisfied with the aesthetic properties of varnish, which is why much more often citizens choose opaque coating compositions.

How to paint OSB board correctly

Paint for OSB slabs on the outside may be uneven. Therefore, it is important to know particle board.

The structure of the tile ends is more porous, and therefore their ability to absorb is greater. In order for the density of the paint and varnish material to be the same on all sides, the edges must be puttied or.

Before painting the edges of the slab, you need to sand the corners, rounding them a little. Otherwise, the surface will become unevenly colored. If the texture of the OSB is damaged, then you will need to putty the entire slab before starting to paint the surface.

Applying a primer is considered a mandatory procedure. It makes the coating more even and improves the adhesion of paint to wood. As a result, the service life is extended decorative finishing.

Painting OSB boards should be applied in two layers, and sometimes three or four paintings are required. This is caused not only by the need to protect the OSB board from the outside from negative external factors, but also by aesthetics. Through thin layer paints show through chips of building materials, negatively affecting the appearance of the facade.

It is important to consider that each subsequent layer must be applied only after the previous one has completely dried.

To extend the service life of decorative finishes and facades, it is necessary to use antiseptic protection. This does not apply to OSB-4, since during manufacturing it is treated with all the necessary impregnations.

Painting OSB boards step by step

It is necessary to correctly follow the technology that allows you to effectively paint OSB, namely, perform the following steps in turn:

1. Make filling interpanel seams using sealant, in particular acrylic.
2. Carefully clean and prime the slab coating.
3. When applying paint and primer, it is important to pay special attention to the ends, since they are considered the most vulnerable point of sheet building materials.
4. The edges of the OSB must be painted until all are visiblely rounded. sharp corners.

Examples of paint and primer selection. Stamps

In order not to carry out experiments, wondering how to paint the OSB board on the outside and what primer the paint will be combined with, it is easier to make a choice in favor of those options that have already been tested and really work when finishing is done. This will save time and cash and will also ensure durability.

Combining a primer called “Aqua Primer-3130” with a paint called “Aquatop-2920 - 04” brings good results. For a dense and high-quality decorative finish, only 2 layers of paint composition are required. The result is a smooth, waterproof surface with high protection from ultraviolet rays. You can use detergents for cleaning later.

There is a more economical way to successfully combine colors. Namely, a primer called “Teknol-2881” together with a paint called “Nordica Eco-3330”. This combination, according to its own parameters, is not much different from the previous one, but is not very well able to withstand the negative effects of household chemicals.

Wish

Execute decorative painting OSB boards are simple and inexpensive. It is enough to complete proper preparation coating, grind sharp corners, prime the walls and apply a suitable paint and varnish material in several layers.

All that remains is to choose color scheme completely tailored to your personal preferences. Your home is your rules.

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OSB (oriented strand board) is a modern building material replacing plywood. Wall cladding frame house plate allows you to increase the functionality of the structure and give it aesthetic appearance. In this article we will tell you how to carry out internal and external wall cladding, and also analyze the advantages and disadvantages of OSB boards.

Area of ​​application of the material

IN lately OSB products received wide application in various directions, for example:

• in the production of furniture and packaging;
• For interior decoration cars and trucks;

In construction, you cannot do without this product. Thanks to its unique manufacturing technology, the slab does not deform, does not shrink, and also allows you to hide all internal defects. If we consider the use of slabs in the context of work, it is used for:

• Sheathing the walls of the house, which provides greater protection to the structure from the penetration of moisture, dampness, and also additionally insulates the walls. After covering, the product does not require finishing work. The construction of frame-panel structures, OSB increases the moisture resistance of the structure. The slab can be used in the construction of reusable formwork.
• External wall cladding. Used as a base, and for interior works it serves as a finishing material.
• Manufacturing of sheathing, rafters and roofing. The slab can withstand any load and the weight of the roof itself.
• Alignments flooring or to install it from scratch. This material is an ideal option for obtaining a durable and even floor.

For information! If the OSB product is located outside the building and needs to be painted, difficulties may arise, because... the coating used must reliably protect the product from external factors (wind, precipitation, sun rays).

Types of plates and their characteristics

All products are divided into 4 types, each of which is responsible for its own area of ​​application. There are types of slabs:

• OSB-1 – designed for work in low humidity conditions;
• OSB-2 - intended for the construction and installation of load-bearing structures indoors;
• OSB-3 - designed for constructing walls, partitions and durable load-bearing structures;
• OSB-4 - designed for carrying out construction work accompanied by high loads.

For information! The oriented strand board market consists of 90% of the type OSB 3.

The main characteristics of the plates include:

• Convenient product size that is ideal for various applications, for example, you can block two spans at the same time.
• Ease of processing.
• All products are easy to saw with any tool, and the cutting area is smooth, without cracks or chips.
• Durability, the product can withstand heavy loads and hold any type of fastener. The quality of the plate is not inferior massive board. Smooth surface.
• The product does not require additional finishing or processing; after its installation, you can immediately paint or cladding.
• Low cost makes the product popular and in demand.
• Light weight. The average weight of the slab is 18 kg, which greatly simplifies the task of delivering and carrying it.

Advantages and disadvantages of the product

The main advantages of the material include the following:

• High strength: modulus elasticity, resistance to bending ruptures.
• Moisture resistance due to special resin impregnation, which makes the slab resistant to rain and snow.
• They absorb noise well. Due to the chips and resin, it is formed high density, which eliminates extraneous sounds.
• Light weight. The product can weigh from 15 to 40 kg.
• Easy to install. The product is easily attached and cut with absolutely any tool.
• Environmentally friendly. The production technology uses a permissible amount of wax and resins, each product has a special “Eco” label.

Of the shortcomings, only one can be noted - the use of low-quality resins containing large number formaldehyde, which can evaporate and harm human health. But using such slabs for the outer cladding of a building is absolutely safe.

Exterior decoration of the building

External skin walls of a frame house requires compliance certain rules, which follow from the characteristics of the products. For outdoor work, products with a thickness of at least 11 mm are used. The work process is divided into stages:

• The OSV slab is attached to the rack so that the joint is located in the middle.
• There must be a gap of at least 3 mm between the plates.
• The bottom trim must be covered with a sheet.
• In a two-story building, the sheet must extend onto the rack of two floors, this will give greater rigidity to the structure.
• Sheathing window openings is performed as a whole sheet, which allows all joints to be placed on adjacent racks. Window openings are simply carefully cut out.
• To perform fastening, it is best to use spiral-shaped nails or self-tapping screws.

It is worth noting that when covering the outside of a frame house, experts follow certain rules:

• fixation of slabs in intermediate areas is fixed at a distance of 300 mm; slab joints are fixed every 150 mm;
• For every 100 mm, the outer side is stitched;
• to prevent splitting of the material, fasteners must be placed at a distance of 1 cm from the edge of the product;
• The slab should be fastened both horizontally and vertically, this will give greater strength and reliability to the building.

Interior decoration of the building

Sheathing a frame house inside with OSB boards is practically no different from drywall. The only thing is that when attaching the slabs it is necessary to use strong fasteners, because... the board weighs more than drywall. For installation use wooden frame and 50 mm self-tapping screws. After fixing the products, they can be sanded and primed.

For information! The slabs can be laid as flooring; to obtain a durable coating, the panels must be placed perpendicular to the joists.

In addition to priming and painting, products can be treated with absolutely any facing material.

• Varnish. The technology of use is the same as for installing floor coverings.
• Dye. Water-based paints and varnishes ideal option, because they are able to best pass steam and provide a good indoor microclimate. As a rule, paints are used for ordinary wood.

Important! The use of water-based paints and varnishes will lead to deformation of the slab.

• Wallpaper is glued only after thoroughly priming the surface, using wallpaper glue with the addition of PVA.
• Plaster. The sheets can be plastered; for this purpose, a mixture is used for interior work.

Sheathing a house with OSB product is optimal and inexpensive option building material that can improve performance and improve the appearance of the building.

The façade is business card any country house. Despite huge selection modern and proven options for facade finishing, users of our portal are not afraid to experiment.

The experience of a FORUMHOUSE member with the nickname is interesting Victor Banev, who decided to ennoble old dacha, making a facade from OSB (or OSB, oriented strand board) with further imitation of the layout of half-timbered wood.

Durability of OSB

Usually, everyone who decides to do something like this is primarily concerned with the question - what will happen to the facade in 3-5 years if it is sheathed with OSB.

Some people think that the slabs will swell, because... OSB is not finishing material, intended for use on the “street”. Some people believe that this cladding option is possible and, moreover, optimal from the point of view of reducing financial costs and the possibility of independent repetition.

Victor Banev User FORUMHOUSE

Whether or not to use OSB on the facade - opinions vary. I decided that the game was worth the candle in terms of speed, ease of installation and low cost of such a facade. I just note that the facade is made ofOSB is an economical option for thrifty summer residents. To decorate a permanent structure - a cottage - more weather-resistant materials should be used.

Looking ahead, let's say that the service life of the facade made of OSB boards has already entered its third year, and the following photo clearly demonstrates what it looks like.

Pie wall with OSB

The result is impressive, and now let's move on to practice. There is an old uninsulated dacha measuring 6x8 meters. The outer cladding is inch board. On top of the boards is painted hardboard. Place of alteration - Leningrad region, i.e. area with more high humidity than Moscow, with frequent rains, fogs and short summers.

It is required to insulate the building from the outside and make beautiful facade. The budget is minimal. This means: work without hired workers, using relatively inexpensive materials and technology that can be done by two people. The user’s train of thought when choosing methods for finishing the facade is also interesting.

Victor Banev

I don't like finishing the facade with siding. It's boring. Block house is too expensive. The well-proven option of using CSP (cement particle board) for further painting and imitation of half-timbering is also eliminated. Expensive and due to heavy weight, it is difficult to lift the sheets, and even more so, to mount them at a height. Sheathing it with clapboard is also not the same. But I, as they say, fell in love with half-timbered wood and began to think about how to bring this idea to life.

After going through several options, the user decided to make the façade he liked so much as a half-timbered structure based on OSB boards. This, according to the user, is much cheaper and easier than fiddling with the DSP.

Pie wall based on OSB

As a result, the user came to such a “pie” of the wall. From inside to outside:

• drywall;
• wall;
• insulation – mineral wool, laid in 2 layers, with a total thickness of 100 mm;
• wind- and moisture-proof membrane;
• counter-lattice;
• OSB 3 boards with imitation of half-timbered layout.

Since total savings are at the forefront, the first thing the user of our site did was Victor Banev, I virtually laid out the slabs on the walls to minimize cutting and waste.

Moreover, sheet dimensionsOSB dictate the location of the decorative layout from boards (25x100 mm), which cover the joints of the slabs and imitate half-timbered timber.

After several intermediate layout options, we managed to come to a common denominator. A sheet measuring 224x122 cm, placed vertically, almost completely covers the wall, and overlays (boards) are needed only to protect the vertical joints of the slabs. We'll tell you how to estimate the layout (having taken all the necessary dimensions from the facade in advance) using the example of the left wall of the house.

If you look at the picture above, you will notice that 2 whole sheets of OSB are placed vertically on the left and right. Based on the results of wall measurements, it turned out that the distance (remaining gap) in the middle is wider than one sheet, but narrower than two. Those. - we need to sheathe the wall with two pieces laid horizontally, and then close the resulting horizontal seam. To maintain symmetry and overall design layouts, add horizontal strips to the outermost OSB sheets and proceed in a similar manner along the entire perimeter of the building.

The layout of the slabs and boards that cover the joints depends on the size of the house, and each case should be considered and calculated individually.

Installation of slabs

Having dealt with the layout design, we move on to installing the slabs. The work is simple, but there are a number of nuances. First of all, let's not forget that curtain façade requires good ventilation to exit excess moisture. If we neglect the main ventilation duct (gap) with an exit in the upper part of the facade, then the moisture will be locked inside, behind the OSB boards, which do not allow steam to pass through well, and with a large thickness are practically vapor-tight. Hence - a bunch of problems in the form of mold and waterlogging of the insulation.

The user is left with a gap at the top of the façade, approximately 1.5 cm across the entire width of the panel.

We proceed directly to the installation of OSB. The thickness of the slabs in this version is 9 mm. This is quite enough, because the sheets practically do not carry any force load. First, on the walls, outside, we stuff a frame - a lath made of vertically placed wooden blocks with a cross-section of 50x50 mm.

We lay mineral wool insulation between them, by surprise.

Next, we stuff the horizontal sheathing and, accordingly, lay the insulation (the so-called cross insulation), orienting it horizontally. Thus, the joints of the slabs are overlapped. Then we attach vapor-permeable moisture-proof membrane, with obligatory overlap and gluing the joints with tape (double-sided).

Then we fill vertical bars 30x40 mm for fastening OSB sheets.

Victor Banev

The installation step of the bars is 0.4 m, i.e. it turns out: 3 vertical strips per 1 sheet. The OSB was secured with self-tapping screws, 6 pieces each. for 1 block. A gap of 2-3 mm was left between the sheets. Next, the gap was carefully painted over, although I think this is not necessary, because... from direct contact with rain or dew, the ends of the slabs will be protected by wooden plates 100 mm wide.

In addition to insulation, the windows of the house were replaced, for which they were moved forward on frames made of 5x15 cm boards.

Once the sheathing was completed, we began painting the assembled walls.

Before painting, one additional layer of universal bioprotective moisture-resistant impregnation, based on varnish, was applied to the surface of the slabs. Application was carried out on 2 sides.

Next, the slabs, before installation on the walls (this makes it easier and faster to work), were covered with two layers of acrylic facade paint. At the coverage stage, the user made one mistake, which will be discussed below, but for now we suggest looking at what happened at this stage. According to the user, the result exceeded all expectations.

If you move 1.5-2 meters away from the facade, you get the impression that the walls are finished with plaster, and it is impossible to understand from the street that this is a facade made of OSB boards.

In addition to the decor, instead of the old porch, a summer veranda in the shape of the letter L was erected from 15x15 cm timber.

After this we moved on to finishing– installation of half-timbered layout. The planed layout board has different lengths. Somewhere - 2, somewhere - 3 meters.

Diagonal jibs, 2.5 m each, are made from one solid board.

The boards are attached at the edges with self-tapping screws. The result is a strong, hermetically sealed connection that does not allow moisture to enter.

For contrast, the boards were painted dark brown.

Three years of operation of the facade confirmed the correctness of the technology. The OSB boards at the ends have not swollen, the paint has not peeled off, and the quality of the façade is consistently high. The only point mentioned above: due to an error made at the installation stage (several slabs “forgot” to be treated with bioprotection), the outside of the OSB was covered with fungus, which in some places emerged from under the paint.

The slabs treated with protection were not affected by mold. This error turned out to be easy to fix. The cladding was removed and painted again (for safety, with an antiseptic additive). A year later, the fungus did not appear. What happened in the end Victor Banev, show the following photos.

Andrey Pavlovets FORUMHOUSE Member

The facade has been in use for 10 years. I went over the DSP boards with water-based emulsion 2 times, and that’s it, since then I haven’t touched up anything in all this time. The paint holds up just fine. I did everything myself. I sawed a 1200x3600x10 mm DSP into squares with a side of 1200 mm. Otherwise you won't be able to lift it. The most difficult thing is to make the upper corner outer elements. To sheathe, you had to climb up a ladder; if you made a mistake with a cut, you had to go down and cut again. I drilled holes for the screws in advance, then attached them with fasteners and, using a system of blocks, lifted them up. It's difficult, but it's worth it.

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