If you need a flat and durable base for laying flooring, one of the fastest and simple ways - leveling the floor with plywood. Compared to a screed, this method has many advantages: it does not require special skills and tools, repairs can be continued immediately after installation, and the price of plywood is cheaper. Depending on the thickness and impregnation used, the price for a plywood sheet varies from 300 to 1200 rubles.
Not every sheet material can be used on the floor.
- Plywood - the best option... It consists of glued veneer sheets, each new leaf laid perpendicular to the fibers of the previous one, which increases the rigidity. Moisture resistance, durability and environmental friendliness depend on the binder used (you can distinguish it by marking).
- Most often, the FC brand is used for the floor. It is made on the basis of carbamide glue, and has a lower moisture resistance, easily swells from moisture. Suitable for rooms with normal humidity, as it is safer for health.
- FSF marking has increased moisture resistance, but not very environmentally friendly, made on the basis of phenol-formaldehyde glue. It is best not to use it indoors due to phenol emissions.
- DSP - ideal for alignment wood floor under the tiles.
- OSB - completely eco-friendly material, theoretically it can be used for leveling, but it is undesirable, since it sags more easily at the same thickness as plywood. In addition, OSB is usually slightly more expensive than plywood.
- Chipboard - has poor environmental friendliness and low strength.
- Fiberboard - not suitable for leveling, because it is too flexible material and it will go around all the irregularities.
- Before starting work, the screed is thoroughly cleaned of dust and debris and covered with a deep penetration primer.
- Apply the glue with a notched trowel to the plywood or on the floor and lay it with an offset of the joints. We also leave technological gaps of 2-5 mm between the sheets and near the wall.
- For additional fixation, we drill holes with a perforator, insert the dowels and tighten them so that the screw heads do not stick out.
- Close up the gaps between the sheets gypsum plaster... If later it is planned to lay the laminate on plywood, then you can leave them as they are, or seal them with sealant.
- When the plaster hardens, it is treated with a trowel mesh and the seams are glued with reinforced tape.
- Irregularities in the screed can be corrected by filling them fine sand... It is advisable to seal the cracks in the corners polyurethane foam (this is especially true in panel houses).
- When installing on a concrete floor, it is almost always important to use waterproofing, since concrete can release moisture even several years after pouring, and the tree will eventually rot on the underside.
- If there is a desire, then you cannot make a rigid fastening of the lag to the ceilings or walls. It is advisable to install them on felt or rubber pads so that small vibration noises are damped. The lags should not touch the walls, step back 2-3 cm from them.
- Before starting the installation of the first lag, you need to find zero level, relative to which all other lags will be aligned.
- The timber for the lags is set in level; for additional leveling, you can use wooden lining. The main thing is that the timber should stand steadily: in the future it will be tied by the sheathing and it will not budge.
- In addition, it is recommended to make intermediate logs for plywood so that the size of the cells is small and the sheets can be well pulled to the frame. To do this, the logs are tied with crossbars from scraps, screwing them with steel corners. It is advisable to select the size of the cells in such a way that they are multiples of the dimensions of the plywood, and the edge of the sheet always falls on the log.
- If insulation and sound insulation is necessary, insulation is placed in the cells between the lags on the waterproofing - mineral wool... It should be cut accurately to the size of the cells so that the edges are not bent. They close it on top vapor barrier membrane, which will remove moisture, but will not allow it to get inside. It is attached with a stapler to the lags.
- In any case, it is necessary to leave a gap of at least 2 cm under the plywood so as not to disturb the ventilation of the floor. If, after warming and fixing the vapor barrier, there is no gap, a 100 * 25 mm board is screwed onto the logs, which will serve as a counter-lattice.
- An important point - right choice self-tapping screws. Regular black hardened self-tapping screws are not suitable for this job. Bad screwdrivers simply won't tighten them to the end, but good ones will break them. Therefore, you need to use special yellow self-tapping screws for wood with a powerful planting hole.
- So that the floor does not creak in the future and the plywood is better pressed against the logs, you must first drill the scroll place with a wood drill (with a sharp end).
- As in previous cases, the sheets are laid apart in order to avoid cross-shaped joints (should be T-shaped).
To level the floor, you can buy 3-4 grade plywood, the presence of knots will not affect the final quality, they will be covered with a floor covering.
Laying tiles on plywood is not recommended, as wood has high coefficient expansion, and it may fall off with the change of season.
Methods for leveling the floor with plywood
Depending on the requirements and initial data, plywood floors are laid in several ways.
Before starting work with any wood materials, they must be left in the room where the repair is taking place for at least two days.
Sheathing of a wooden floor with plywood
This method has already been discussed in our article:.
One thick layer or two thin ones?
Plywood is composite material, that is, the layers in it are initially laid with fibers crosswise, due to which the sheet is quite rigid. Therefore, two layers of 10 mm, instead of one with a thickness of 20 mm, will not give additional rigidity to the sheets.
For the price, the result is also practically the same.
However, if one layer of plywood is laid on a curved floor, it will smooth out irregularities, however, height differences will remain at the joints. If you put an additional layer, the height differences will be smoothed out, and the edges of the second layer will already lie in the center of the sheets of the even first layer.
Therefore, it is better to use two thinner coats for alignment.
What if there are large indentations in the floor?
If large pits are found on the floor (which could have formed due to the heavy load in this place), then it will not be possible to simply lay plywood here - it will repeat the contour of the recess.
Bonding plywood to the floor
Laying plywood on a concrete floor allows you to hide minor irregularities in the screed and make it warmer.
To fix the sheets, you will need glue and dowel screws. From tools: notched trowel, hammer drill, screwdriver or screwdriver.
Glue with the addition of pine resin is best suited (often it is not indicated in the composition, but its presence can be determined by its smell); this is, for example, Thomsit 200 or 400.
For better adhesion of the glue to plywood and concrete, the floor is pre-primed.
The length of the dowels is chosen so that they go 4-5 cm deep into the screed.
Adjustable stiletto plywood
Plywood on heels The next technology is the installation of an adjustable floor.
Laying plywood on the floor along the logs
In addition to leveling, laying plywood on logs allows you to make additional insulation or soundproofing the floor. Compared to standard optionWhen the logs are sheathed with a tongue-and-groove board, plywood can speed up the process. With a standard pitch of 50-60 cm, plywood 15-22 mm thick will be enough.
It is easy to check this yourself: put plastic wrap for a day. If perspiration forms under it, then waterproofing is required. The easiest way for such a floor is to make waterproofing from ordinary plastic film, gluing it together with scotch tape with an overlap on the walls.
This approach allows you to prepare a reliable base for laying linoleum, vinyl tiles, carpet, parquet, and if the differences are less than 2 mm per meter, you can even
- an operation that allows short time and level the floor surface with maximum quality without removing the old floor covering. Before proceeding installation works, it is necessary to select a material that meets the requirements of the technological process in all parameters:
- grade;
- thickness;
- immunity to moisture;
- quality of impregnation (and by what means);
- number of layers;
- resistance to mechanical damage;
- bending strength.
The advantages of this method of leveling the surface, such as laying plywood on a wooden floor, are undeniable. This is a low price and high level material strength, ease of processing, ease of installation. It is also important that preparatory work reduced to a minimum.
Features of mounting a wooden covering
It is possible to put plywood on the floor in cases where the floor boards dry up and become unusable, replacing the failed elements is impossible or unprofitable.
To achieve a positive result, it is important to strictly observe the requirements and rules of the technological process:
- Plywood is laid on a wooden floor only if there is no deflection along the logs and a complete dismantling of the floor is not required.
- The room where the work is planned to be carried out should not be humid.
- Dry installation. According to the plan, 3 seams should converge at one point.
- There must be at least 1 cm gaps between the individual sheets and between the plywood and the walls.
- Laying is carried out in strict accordance with the plan and markings, and for this, all sheets are numbered before installation.
- When fixing sheets with self-tapping screws, all fasteners are placed at a certain distance from each other. The size of the step is 20 cm, the indent from the edge of the sheet is 2 cm. The caps of the self-tapping screws should be sunk by 1–2 mm.
- Self-tapping screws are chosen so that their length is 3 times the thickness of the plywood.
Before proceeding with the installation, a moisture test must be carried out. To do this, you will have to lay a plastic wrap on the floor and only after 3 days, making sure that there is no condensation on its back side, make a positive decision to carry out the work.
Important! Before laying plywood on an old wooden floor, the base must be processed grinder and impregnate with a primer, which contains antiseptic additives.
Such processing will provide full protection of the structure from rotting, the appearance of fungus and mold.
Preparation and cutting of material
Before laying plywood on wooden floors, it is necessary to carry out preparatory work, including determining the maximum drop, identifying dips or bends, which can be leveled using a special underlay or board tightening. If there are differences in excess of 1 cm, you will have to lay additional logs made from bars of small thickness.
When choosing plywood, it is important to consider what the finishing flooring will be like:
- linoleum;
- carpet;
- laminate;
From thickness floor material the thickness of the stacked sheets depends. In order to lay plywood on an old wooden floor, you will need a special set of tools:
- jigsaw and screwdriver;
- seal and level with spirit level;
- tape measure and construction pencil.
The floor surface also requires preliminary preparation, which consists in grinding, priming, possibly additional fixing of the boards.
You need to cut the purchased plywood sheets before starting work. This operation is performed in accordance with the layout plan and the size of the room. Layout starts from the far wall.
On the plan of the room, its middle is marked, which will correspond to the middle of the first sheet. Subsequent elements will be laid in different directions from it. You can determine their shape and number by dividing the entire area of \u200b\u200bthe room into squares with a side of 60 cm.
During cutting, one must not forget that there must be a gap between the walls and structural elements. Otherwise, the floor will "rise" and the plywood covering will have to be dismantled.
As will be shown in the plan, number the components, cutting out bends and protrusions if necessary. It is difficult to lay plywood on an old floor of planks in a room with complex geometry, here the exact numbering of structural elements is especially important.
Work order
How to properly lay plywood on a wooden floor? It is important to follow the installation plan exactly and strictly follow the installation sequence.
If there is a difference in excess of 1 cm, the frame is installed around the entire perimeter of the room and the lags made of plywood... Their width is 30 cm, and the distance between them should not exceed the indicated figure. The laying of the covering sheets is carried out in such a way that the joints between them are exactly in the middle of each log, between which a thin insulation can be placed.
The absence of drops or their size, which does not reach 1 cm, allows plywood to be laid on the substrate. In this case, it is important to remember about the need for gaps between walls and sheets, and also strictly observe the sequence of laying, paying attention to the numbering of sheets.
The substrate is spread close to the walls. Fixing the floor material is not required, but if desired, you can fix it in several places with the staples of a construction stapler.
Plywood is laid directly on top of the substrate, doing it with an offset and in accordance with the plan.
Self-tapping screws are screwed along the edges and diagonals. The fixing step is 20 cm.
During the installation process, make sure that all screw heads are screwed in. This will make further work easier and safer. After the installation is completed, the surface is sanded and treated with antiseptic compounds.
How to properly attach plywood to wooden floor? This question interests many. And why does it even need to be fixed to the floor? What functions does it perform? Let's consider everything in more detail.
Why do you need plywood?
When laying finishing material on the floor, preliminary leveling of the base is necessary. If this is not done, then not only may suffer appearance finishes, but also its integrity. For example, a snap-joint laminate can crack, linoleum can fray at bulges, etc.
The best option for leveling a wooden floor is to lay plywood. Plywood is a multi-layer veneer that is connected to each other using a special glue. The material is divided into three main types: peeled, planed and sawn. By texture, homogeneous and combined plywood is distinguished. Depending on the surface treatment, the material is divided into sanded, non-sanded and laminated types. According to the degree of moisture resistance, plywood of limited moisture resistance (FB), medium moisture resistance (FK, FS, FBA) and moisture resistant (FSF) are distinguished.
For leveling, it is better to use plywood of the FK brand with a thickness of 10 or 12 mm with a surface sanded on one side. It is these sheets that are distinguished by sufficient strength and reliability. If, on top, a fairly heavy finish with a significant thickness (for example, parquet with a thickness of 22 mm) will be laid, then the sheets, respectively, must be taken in large sizes. You can also use a moisture resistant type of material. However, it will cost more, which must be taken into account when purchasing.
How to fix plywood to wood floors? For work, you need to stock up on a drill, screwdriver, hammer, electric jigsaw, tape measure and building level.
Preparation of material for laying
How to lay plywood on a wooden floor? First, the plywood must be prepared for installation. In any case, the material should be kept in a horizontal position indoors for 1-2 days. If plywood was purchased during the cold season, it is recommended to dry it. To do this, it should be left upright for about 2 weeks. After that, the material is coated with an antiseptic fungicide and dried.
To improve the moisture-resistant properties of plywood, processing with a PVA-based putty will help. After applying the composition, the sheets are dried in an upright position. However, it is not recommended to use the material on open balconies and loggias.
The strength of the plywood can be improved by applying 2 coats of acrylic lacquer to its surface. The second layer is applied after the first has dried.
Laying technology
Before placing the plywood, the wood floor must be prepared for finishing.
Old rotten boards should be removed and replaced with new ones. You can work the surface with a plane by peeling off the old layer.
If the boards are poorly fixed, wobbly, then they should be fixed with nails or self-tapping screws. After that, all dirt and dust is removed from the surface.
The next step is to lay the plywood on the floor. Preliminarily, the sheets are laid out on a wooden floor, marks are made at the cut points with a pencil and tape measure. All sheets are numbered, which excludes improper attachment further.
Then you can start laying and fastening the sheets. Consider how to lay plywood on wood floors. Laying should start from a corner that is higher than all others. The sheets are fastened with self-tapping screws. The interval between fasteners should be 15-20 cm, the distance from the edge should be 1.5-2.0 cm. It is recommended to take the length of the self-tapping screw equal to the thickness of the plywood sheet, increased by 3 times.
You can also use nails to connect. However, the process takes much longer, and the reliability of the connection is similar to that of fastening with self-tapping screws.
After attaching the first sheet, the canvases are stacked further. At the same time, it is important to take into account that plywood must be laid apart, that is, the corners of adjacent sheets should not be connected at one point. This makes the base more durable and reliable, eliminating the risk of deformation of the canvas.
At each subsequent laying of the sheet, it is necessary to check the evenness of their location. For this is used building level... The evenness is checked both on the sheet itself and its location relative to another sheet. For this, the building level is located at the junction of two adjacent elements.
If the plank base has small differences in height, then they are filled special backing, or a self-leveling mixture. If the differences are large (from 1 cm per sq. M), then it is necessary to install logs. Their position and height are regulated by the building level.
If it is necessary to give the floor additional strength (in places where heavy objects, furniture) are installed, plywood is laid in two layers. The sheets are glued together with PVA glue.
This completes the installation of the plywood on the wooden floor. Now you can proceed to further installation with finishing material.
Plywood is an economical building material that is used as a basis for further work or is used to level the floor for future flooring (parquet, laminate, linoleum).
The advantages of using it for finishing the surfaces of the room:
- strength;
- moisture resistance;
- heat resistance;
- high-quality sound insulation;
- environmental friendliness.
It is important to decide before starting work suitable material... Depending on the technical characteristics and operational properties, there is a wide selection of this building material on the market.
Plywood varieties:
- Moisture resistant on carbamide resin (FC). The advantage is the elasticity and strength of the material.
- Unpolished with casein glue (NSh). Requires sanding before gluing.
- For subfloor (Ш1). Feature - sanded on one side. Casein glue base.
- Polished on both sides, based on casein (Ш2).
When choosing plywood, you need to pay attention to a number important nuances, on which the properties of sheets and the possibility of their application directly depend. Moisture resistance, material of manufacture and formaldehyde content are the main evaluation criteria when choosing a building material.
The most suitable option for internal works moisture resistant FC sheets.
Depending on wood defects and processing defects, 4 types are distinguished:
- 1 grade - a small number of flaws or their complete absence is permissible;
- Grade 2 - the presence of scratches and dents is possible, the area of \u200b\u200bwhich does not exceed 5% of total area plywood sheet;
- Grade 3 - the presence of healthy, partially intergrown knots and the presence of wood inserts are permissible;
- Grade 4 - material where allowed a large number of defects and flaws.
Considering the cost and quality of the most suitable option is a building material of the 2nd grade.
Cutting and fitting plywood
Determine the quantity required material it is possible by calculating the surface area of \u200b\u200bthe floor. It is important to add about 10% to the stock when calculating. Standard sizes sheets of this building materialtypically 1.25 x 1.25 m. It is not always convenient to work with such parameters. Accordingly, pre-sawing will make it easier to fit and lay the building material.
Please note that the best option is to cut into 4 squares. This will make it possible to get the right amount expansion joints required for best styling warm floor.
The simplest sawing tool is a hacksaw. But there may not always be an effective and quick result. Ideal option will use a jigsaw or circular saw - they do not leave any chips or delamination.
Once the material has been cut, it must be laid out on the surface for preliminary fit. In this case, the use of glue or screws is excluded.
Please note that it is necessary to leave 8 - 10 mm seams between squares and 15 - 20 mm between building material and walls. By numbering the elements or drawing up a diagram of the area to be covered, you can greatly simplify the final work.
Methods for attaching plywood to the base
Fastening plywood to concrete floor can be carried out using dowels and glue. Today, there are several types on the building materials market adhesives.
Its application features directly depend on their basis:
- on water based (safe for human health, but dries up for a very long time);
- on a solvent (advantage - fast drying, disadvantage - pungent unpleasant odor);
- based on two components (no pungent odor, dries in a short period of time).
The most preferred view plywood glue on concrete floor is precisely two-component glue. Its use is possible even if plywood is glued to a partially dried screed.
Step by step guide to stacking sheets
Plywood is laid on a concrete floor in several stages. If you follow the instructions carefully, you will not have to involve specialists, which will significantly reduce costs. How to fix it to a concrete floor in several stages is described below.
Checking the moisture content of the concrete base
To avoid delamination of the plywood coating in the future, it is important to monitor the moisture content of the substrate. It should not exceed acceptable valueotherwise the plywood may delaminate in the future.
At home, moisture can be checked with plastic wrap. The film is laid out on the concrete and press down its edges with a load. After a week, check the condition of the film.
If condensed moisture is present, lay this material it is impossible. Before this, with the help of appropriate compositions, it must be created additional protection from moisture.
Cleaning the base
Plywood floors should only be installed on concrete floors after stripping and priming. With the help of a grinder, it will not be difficult to grind the base.
Cracks, other defects must be eliminated using special mixtures, for example, cement-sand mortar... The substrate must be thoroughly free of dust. Ideally, an industrial vacuum cleaner is used for this.
Never use a broom with water for cleaning. Moisturizing the screed will harm high-quality fastening plywood sheets.
Base primer
Before installing the sheets, it is necessary to prime the concrete base. For priming, it is better to use formulations recommended by the manufacturer of the selected building material.
- removes the smallest dust particles;
- provides the base with maximum strength;
- provides strength and reliability of joining materials;
- prevents residual moisture.
Plywood laying
According to the numbering of the sheets or guided by the drawn surface scheme, it is necessary to glue the sheets of building material.
The sequence of laying out the building material on the floor is carried out in several stages:
- through notched trowel concrete base covered with a layer of glue up to 2 mm. Note, glue is best applied small areasto have time to lay out plywood sheets before the adhesive begins to set;
- according to the previously drawn scheme, plywood is laid on the concrete. It is recommended to roll the sheet with a heavy roller;
- using self-tapping screws with dowels along the perimeter and diagonal, the sheets must be additionally fixed. It is recommended to fix the self-tapping screws at a distance of 150-200 mm from each other; there must be a distance of at least 20 mm between the wall and the flooring. The diameter of the holes for the self-tapping screws should be of such a size that when screwed in, its cap is recessed;
- to get rid of minor discrepancies in the height of adjacent sheets, eliminate burrs and other minor defects, treat the laid sheets with a sanded machine or sandpaper.
Checking work
Any covering can be laid on a flat treated floor. But before that, it is important to check the work and eliminate, if found, all errors.
It can be done in three steps:
- there must be gaps between the elements, and it is also important to check the distance between the walls and the laying;
- the permissible discrepancy in the height of the surface should be within 2 mm;
- it is important to check that there is no air space between plywood and concrete. To do this, you need to gently knock wooden block or with a hammer of the same material over the surface. The sound should not be muffled.
Conclusion
Plywood sheets are strong, durable material that practically does not deform. Sheets laid on frozen concrete screed, this perfect solution for private houses, apartments, where floor level differences are a real problem.
Environmental friendliness of the material, its strength, affordable cost, possibility self-assembly will delight every potential buyer.
- Date: 20-09-2015
- Views: 727
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- Rating: 43
New room finishing technologies affect and floor coverings... In most cases, cork, laminate and parquet boards are used. You should be aware that such materials can only be laid on flat surface... That is why quite often people are faced with the need to level a wooden floor base.
For the home, it is better to choose plywood of the FC brand, it is less toxic and well protected from moisture.
There are several methods for doing this. One of them is leveling the floor base with plywood. In order to carry out all the work correctly, you need to know how and with what you can fix plywood to a wooden floor. In addition, you need to know what surface preparation work will need to be done.
Benefits
The principle of leveling a wooden floor with plywood on adjustable joists.
It makes sense to use plywood for leveling floors, because it has the following advantages:
- Low cost.
- The adjacent layers are perpendicular, so the plywood sheets will have good strength in all directions.
- Plywood sheets are produced in large sizes, which makes it possible to perform fast installation over large areas.
- Plywood sheets can bend well without breaking.
- Plywood sheets are easy to transport.
- Such sheets are unpretentious to use.
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Styling nuances
Laying plywood on a wooden floor is especially important when the plank floors dry out, loosen and become unusable. Plywood allows you to make repairs in an optimal way - with minimal money and labor costs.
When laying sheets on a wooden floor, it is important to know the following nuances:
- First of all, you need to check whether the wooden floors do not sag along the logs. If there are deflections, then it is necessary to completely disassemble the flooring and repair the subfloor made of wood. If the problem is not with the logs, then it is best to lay the plywood on a wooden base.
- It should be remembered that plywood should not be used where there are large temperature differences and high humidity... For bathroom and unheated premises plywood sheets will not work. To check if there is high humidity near the floor, you need to tightly put a sheet of polyethylene 1x1 m in size and leave for 3 days. If on inside there will be no condensation, then plywood can be put on the floor.
- Plywood is laid dry with an offset so that at least 3 seams converge at one point. Separate sheets are adjusted to the size of the room, while it is necessary to bypass the protrusions and fill the niches. In the process of carrying out such a procedure, you need to remember that a gap of about 9-10 mm must be left between the scattered plywood. In the future, these gaps will be covered. There should also be gaps between the walls and the plywood, which in the future will be covered with baseboards.
- In order not to confuse the fitted sheets in the process final assembly, you need to number them and draw up a plan diagram.
- It is best to cut the plywood sheets into squares with sides of 60 cm. This way you can get a suitable number of damper joints. In this case, it will be easier to find bundles that may not be noticed in solid sheets.
- Before the final laying of plywood, it is recommended to thoroughly clean the base from dust and other dirt. You can also perform priming, which consists in treating the floor surface with a primer.
- The plywood should be installed with glue. If no glue is to be used, each sheet must be secured with self-tapping screws along the edges and diagonals. The step of the fasteners should be 18-20 cm. The distance from the edges should be 2 cm. The screw heads are recessed.
- Fasteners must be at least 3 times longer than the length of the sheets. For example, 40 mm self-tapping screws are suitable for 12 mm sheets.
- After installation, the base must be carefully sanded. This can be done using parquet grinders and sandpaper with large grains.
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Preparation works
The installation of plywood on a wooden floor must be done correctly and using necessary tools... The master must have experience with all the tools to be used.
To lay plywood, you need the following elements:
- Screwdriver.
- Electric jigsaw.
- Building level.
- Roulette.
- Self-tapping screws.
- Dowels.
- Wood glue.
- Plywood sheets.
- Sealant.
Before leveling a wooden floor with plywood, you need to check the base for suitability for use. In addition, old boards need to be replaced and creaking elements repaired. It is recommended to check the evenness of the base with a building level.
If the floor surface is not too flat, then it is worth determining the maximum base drop. If small irregularities need to be smoothed out, a floor underlay should be used. If there are drops of more than 1 cm, you will need to lay the log horizontally. They can be set using the water level.
The choice of plywood sheets will depend on the floor covering you plan to install. If you plan to lay carpet or linoleum, it is recommended to purchase sheets of small thickness. If laminate or parquet flooring is to be installed, purchase plywood with a thickness of 10 mm or more.
Thickness of plywood sheets that are laid under the laminate or parquet board, should not be less than the thickness of the flooring.
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Plywood brand
Before styling, it is important to choose suitable brand plywood sheets. It can be determined in accordance with the moisture resistance of the material. For industrial construction, the brands FB and FOF are used. For individual works plywood of the FSF and FC brands is intended for construction.
FK plywood can be used in children's rooms or bedrooms, because in the process of its manufacture, glue without the use of phenols is used, as a result of which plywood is harmless to human health. It has an average level of moisture resistance and is resistant to mechanical stress.
FSF plywood has elevated level moisture resistance, wear resistance and mechanical strength... These properties will not change with changes in temperature and humidity. This is achieved thanks to special resins, but this makes the plywood like this toxic. This material is not recommended for use in living rooms.