Attaching plywood to floor joists. Laying plywood on the floor under linoleum, laminate or parquet. Installation of plywood sheets

Plywood is one of the most versatile materials invented by mankind. Plywood is also widely used in construction: in terms of ease of working with it, strength, cheapness and environmental friendliness, plywood is perhaps unparalleled. Plywood is especially widely used for laying and repairing floors. But the high functionality of plywood also determines a variety of techniques for working with it, so laying plywood on the floor with your own hands requires explanation for different cases practices.

Chipboard or plywood?

Plywood is not the cheapest of flooring and wall covering materials. Chipboard is even cheaper. But let’s leave phenol-formaldehyde resins alone for now - volatile carcinogens, on the basis of which chipboard is made.

Let's do the following experiment: put two pieces of pipe on the floor and lay a sheet of plywood 12 mm thick on them. Let's stand on it and get off. What happened? Nothing. He bent over and straightened up. What about chipboard? Most likely, it cracked at greater thickness. And it will definitely crack if you jump on it.

You can do two more experiments: hold scraps of plywood and chipboard in water and see how quickly they swell and become limp. There is no need to hit the edge with a hammer: everyone knows that chipboard is fragile. Therefore, the question: “chipboard or plywood?” The decision is definitely in favor of plywood.

What types of plywood are there?

There are many varieties of plywood. The following types of plywood are most often used in construction:

• FC is a moisture-resistant plywood based on urea resin, which is non-volatile and non-toxic. It has strength and elasticity comparable to BS aircraft plywood.
• NS – unpolished with casein glue. The cheapest, about 170 rubles/sq.m with a thickness of 12 mm. Before gluing parquet or other hard flooring onto it, it requires sanding.
• Ш1 is the main material used for the subfloor. Sanded on one side. The adhesive base is also casein.
• Ш2 – polished on both sides, on casein. For lightly loaded parts in dry and dry rooms comfortable temperature can be used as a substitute for FC.

What is contraindicated for plywood?

Nothing is perfect, and plywood is made from a hygroscopic material - wood. Therefore, plywood cannot be used in damp rooms: long-term air humidity should not exceed 68%; short-term within 12 hours – 78%. When laying untreated plywood, air humidity up to 60% is permissible.

The indicated values ​​are valid in a comfortable temperature range of 18-27 degrees Celsius. Outside these limits, the sensitivity of plywood, except for FC, to humidity increases: at 16 and 35 degrees and a humidity of 85%, plywood begins to delaminate after two months. Therefore, ordinary plywood for floors and walls should not be used in the kitchen, balcony, closet, hallway and bathroom.

How to improve plywood

The moisture resistance of plywood can be increased by impregnation with polyvinyl acetate (PVA)-based putty; it is similar to very thin PVA glue and is cheap. Soak first on one side until spots appear on the opposite side, then on the other twice. Dry in a horizontal position. It will take a long time to dry - at least 3 days at room temperature. After drying, the sheets are treated with any antiseptic-fungicide for wood.

The strength of the surface layer can be increased acrylic varnish. It is applied in two layers; the second - after the first has completely dried. If plywood needs to be stained for decorative purposes, paint it before varnishing.

Plywood acclimatization

Before describing how to lay plywood on the floor, we should talk about its acclimatization in the room. Plywood, like any wood material, requires acclimatization at the place of use. The acclimatization period depends on changes in temperature and humidity: if the conditions in a warehouse or store are the same as in an apartment, a day is enough; with a temperature difference of 2 to 8 degrees – three days; with more – a week. During acclimatization, the plywood is kept stacked in a horizontal position.

Checking the moisture content of the base floor

Before laying plywood on the floor, the base surface, and not only concrete, must be checked for moisture evaporation. For this 1 sq.m. base surface cover it with a solid square piece of plastic film, pressing it along the edges with slats with weights and lifting the center slightly. What happens next depends on the time at which condensation appears under the film:

1. The bubble fogged up from the inside within 24 hours - the room is unsuitable for covering the floor with plywood.
2. Small drops appeared within 3 days - the base concrete floor needs to be covered with glassine or plastic film, put a construction mounting mesh on it and make a screed. Wooden floor - disassemble; with such evaporation of moisture, the boards from the underside and the old joists are probably affected by rot. An option for 7-10 years is to cover it with plywood with improved moisture resistance using the home method (see above).
3. Condensation did not fall on the 5th day: you can lay plywood in any way.

Plywood base

Leveling the floor with plywood is a widely used construction technique. It is used both for laying new floors and for express repairs of existing ones. For various combinations of base floors and top decorative covering are used different technologies laying plywood.

On concrete

Laying plywood on a concrete floor is possible either directly along the screed or on joists. The first method is used if the base floor is fairly level and the finish is somewhat flexible; for example - under linoleum or cork flooring. Marmoleum can be laid directly on the screed without a subfloor.

Important: remember that after the concrete has set, it must be allowed to dry for at least 40 days at room temperature.

On a flat, dry screed

The room is thoroughly swept and vacuumed. The floor is treated with bitumen varnish or parquet mastic, diluted five times with solvent or kerosene (primerization). When working, they open the windows wide, work in a petal respirator, and in the apartment completely, by unscrewing the plugs or turning off the circuit breaker on the floor panel, remove the power supply: what is a spark in air saturated with vapors? organic solvent, no need to explain.

Plywood 8-18 mm is pre-cut into squares of a quarter of a standard sheet (1250x1250 mm) or strips. They are laid out staggered, i.e. with a shift: there should be no four seams converging at one point. The sheets are cut with a jigsaw or a hand-held circular saw - this can be done in the next room an hour after priming. When cutting, you need to take into account that there should be a gap of 20-30 mm around the perimeter of the room.

Then the sheets of plywood are laid out on the floor, “dry”, adjusted without fastening and numbered. How to attach the plywood to the base floor in this case? Under linoleum or cork, you can simply use glue like bustilate or parquet mastic, without installation gaps - you get a floating subfloor. The ends of the sheets also need to be glued.

Under ordinary oak or similar parquet properties, plywood, along with gluing, is secured with 4-5x60 mm self-tapping screws in dowels. In this case, the sheets/strips must be laid out with mounting slots of 2-3 mm; For this it is convenient to use halves of toothpicks:

Note: It is convenient to use the insert of a combination screwdriver as a screwdriver insert for a drill (see figure above).

On concrete on joists

Under laminate, inlaid parquet or parquet made of valuable wood, plywood is laid on a concrete base. The same is done if the stability of the temperature and humidity conditions in the room is in doubt. The arrangement of the sub-floor plywood on joists is clear from the drawing; we will only give the necessary explanations:

1. Boards for joists are taken unplaned 100 mm (“weaving”).
2. The boards for joists are kept for at least a week in the room where they will be used, after which they are discarded: those that have warped with an arc are put on the bosses, and those that have twisted are completely discarded.
3. Plywood is taken from FC or self-improved, with a thickness of at least 12 mm; better - 18-20.
4. The preparation of the base floor is done in the same way as in the previous case.
5. The sheathing of logs is made in increments of 300-600 mm so that all edges plywood sheets accounted for lags.
6. Sections of the sheathing are filled with polyurethane foam or other hydro- and heat-insulating material, but not mineral wool– it will inevitably cause microscopic needles to appear in the air, irritating the respiratory system.
7. Plywood sheets are laid with an installation gap of 2-3 mm and a gap around the perimeter of the room of 20-30 mm.
8. Attach the plywood to the joists using “liquid nails” glue and fix it with nails; Fastening with self-tapping screws in this case does not significantly improve the quality of the subfloor, but is more expensive.

Note: V Lately Especially for subfloors, tongue-and-groove plywood with a thickness of 12-20 mm has appeared on sale. It is produced in the form of sheets from 300x300 mm and strips from 300x600 mm. For a floor made of valuable parquet, this is the preferable option: the cost of the subfloor in this case will still be a small fraction of the total cost of materials, and the likelihood of moisture vapor leaking from underneath is reduced by an order of magnitude.

Repairing wooden floors with plywood

Plywood is an excellent material for repairing cracked, cracked and creaky wooden floors. In this case, plywood is laid on a wooden floor in single sheets from the door, so that the most commonly used surface is continuous. The trimmings are allowed along the edges and in places under furniture. The plinth is removed as carefully as possible and then put back.

Plywood is taken from 12 mm thick. Installation is done with the usual gap of 20-30 mm around the perimeter, but without installation gaps between the sheets. The sheets are laid on bustilate, liquid nails or any other mounting adhesive; The ends are also glued.

This type of “self-improved” plywood floor, painted with any floor enamel, will last 20 years or more in a bedroom. But it is impossible to repair floors that are damp, swollen, with traces of rot and mold, and in rooms with biting weeds on the walls, with plywood. You need to remove the old floor, look for and eliminate the source of moisture, and only then lay a new one.

Warm floor on plywood

Lay under the plywood concrete screed on a mounting grid with waterproofing on the base floor. There is one nuance here: the edges of the waterproofing film must be brought under the baseboard. If they are muffled with a screed, the fumes from heating can concentrate in one place and cause delamination due to humidity.

When installing a subfloor under a warm floor on logs, this problem does not arise, but there is no point in complicating and increasing the cost of the work: a warm floor dries the room well. So it’s easier to leave a kind of vent around the perimeter for water vapor.

Plywood innovations

Plywood flooring is a branch of construction equipment that appears to be far from over. In the age of composites and nanotechnology, good old plywood does not retreat and finds new applications.

Adjustable floors

These floors are used as a base for wood inlays and other fine, exclusive work. Plywood flooring – double, made of high quality plywood. The sheets of the bottom layer have threaded sockets for bolts. The bolts are shaped: above the thread there is a flat widening in the form of a press washer, and above it there is a neck 3/4 high of the thickness of the sheet for a hexagon or with a Phillips slot.

The top sheet with holes for the necks of the bolts is placed on the bolts screwed into the bottom sheet, and adjusted with an open-end wrench or a screwdriver. When using bakelized plywood, the accuracy of the overall surface is quite machine-building.

Plywood parquet

But plywood parquet is an invention of craftsmen. In him, a forgotten skill was revived at a new level artistic sawing from plywood. The technology of plywood parquet is simple and accessible to anyone.

Plywood of any brand can be easily processed, and therefore all fasteners suitable for boards are, to one degree or another, suitable for plywood. Fastening plywood is carried out in various ways.

Fastening plywood with glue

How to attach plywood with glue is used in furniture production, and therefore FC plywood is used as the material. There are three main methods for gluing plywood - lapping, pressing and rolling.

Gluing plywood by rolling

Gluten, casein and synthetic adhesives can be used for rolling gluing. The essence of rolling comes down to the fact that the base coated with glue and the plywood placed on it are rolled with heated rollers, which press the plywood sheet, promoting rapid setting of the glue.

Gluing plywood by pressing

For pressing, glutinous, casein and synthetic adhesives are used. The technology of press-fit gluing is in many ways similar to the technology of producing plywood from veneer - a base coated with glue with an applied plywood sheet is placed in a press, where under the influence high temperature and pressure, the glue sets and dries

Gluing plywood by lapping

For grinding, only gluten adhesives are used, primarily flesh glues. Lapping is carried out using a heated lapping hammer, which is used like an iron when ironing clothes. The hammer is moved along the plywood grain from the center to the edges. The front side of the plywood sheet must be pre-moistened warm water- to avoid twisting. After the glue has dried, the product is tapped to find un-glued areas. If any, the plywood is either heated (if setting has not occurred due to the rapid cooling of the glue), or glued with an additional portion of glue, which is applied through a longitudinal cut of the plywood sheet or directly under the plywood using a syringe.

Nailing plywood

Used for nailing plywood different kinds nails and studs, however, the requirements for them are generally similar. The length of the nail should exceed the thickness of the plywood sheet by at least 2.5-3 times. It is best to use threaded nails with a flat head, but in the absence of such, others will do. In the event that builders are faced with the task of not spoiling front side plywood best choice There will be wire nails, which are quite difficult to notice. Plywood cannot be nailed along the edge - it may be destroyed. The optimal distance from the edge of the plywood sheet is considered to be a distance equal to 5 times the diameter of the nail head. As for the distance between nails, in the case of plywood it recommends a 10-centimeter interval along the edge and 20-30 centimeters in the middle part of the sheet.

Fastening plywood using screw connections

For fastening plywood, self-tapping screws, screws and bolt-nut and stud-nut clamping systems are used. In the first case, self-tapping screws with a hidden or depressed head are used: the requirements for their use are similar to the requirements for the use of nails. When fixing plywood with bolts or studs, holes for them must be drilled in advance, and the distance from the edge of the plywood sheet should be at least three diameters of the bolt rod. In addition, it is highly advisable to use spacer washers: otherwise, the plywood will eventually be cut through.

Plywood is often used to create flooring. Its smooth surface is considered a good basis for laying finishing material, and some types of plywood are also used as decorative finishing. In this article we will talk about laying plywood on a wooden floor.

Plywood sheets are very often used in construction to create a subfloor, and the reason for this is their positive properties:

1. Plywood is durable, it can withstand significant static and dynamic loads, while hardly deforming.
2. The budget cost of the material makes it attractive and affordable option for most categories of citizens.
3. Long service life is another advantage of such sheets.
4. Despite its strength, plywood is lightweight, which is considered an important indicator in the construction industry.
5. The surface of the sheets is smooth and hard, it is well suited for further installation of almost any floor covering.
6. Plywood is environmentally friendly, safe, does not emit environment harmful substances, has no unpleasant odor.
7. The material is easy to process. It is easy to cut and can be bent if necessary. Transporting plywood is also not difficult.
8. Some brands of plywood look very attractive and can be used for finishing floor. Their processing in such a case will consist of painting or opening with varnish.
9. In terms of its moisture resistance, modern plywood is noticeably superior to chipboards, which have greater porosity, absorb water well and are quickly destroyed by moisture.

When choosing plywood for flooring, pay attention to its thickness. The best option the figure is considered to be 12-15 mm, but if finishing coat If the boards are heavy, it is better to use thicker plywood sheets.

Subtleties of installing plywood on a wooden floor

1. If the floors are laid on joists, before installing the plywood you need to check whether the boards are sagging. If the boards bend along the joists, the covering must be removed and the base of the floor itself must be repaired.
2. Covering floors with plywood is not possible everywhere. For example, in rooms with unfavorable environmental conditions, the material will quickly become unusable. Unfavorable conditions include humidity and temperature fluctuations. Laying plywood is not recommended in bathrooms, as well as in unheated rooms, for example, in basements. By the way, you can check the moisture level of the base yourself by laying it on the floor plastic film and securing it with tape. After 2-3 days, you need to remove the film and see if any back side droplets of water. If not, the floor is dry enough and suitable for laying plywood.
3. Installation of plywood sheets must be carried out offset so that no more than 3 seams intersect at one point.
4. Between in separate fragments There should be small gaps of up to 1 cm wide in the material. They are called damper seams, and they are needed to ensure that the material does not deform as a result of linear expansion.
5. At the junction of the plywood with the walls, the seams should be even wider and amount to 1.5-2 cm. appearance they will not affect the coating, since they will subsequently be disguised under the baseboard.
6. Before installation, the sheets must be cut into fragments of the required shapes and sizes. In order not to confuse the elements during the work, it is better to number them, and schematically depict a plan for their installation on a sheet of paper.
7. Many builders recommend cutting plywood into squares measuring 60x60 cm. In this case, the number of expansion joints will be optimal.
8. Before laying plywood on a wooden floor, it should be cleaned of debris and dust, and then covered with a primer.
9. The material is attached to the base with glue or self-tapping screws. Self-tapping screws are screwed in along the perimeter of the sheet and diagonally, taking steps of 15-20 cm. Approximately 2 cm recede from the edge of the part. The heads of the screws must be well sunk into the wood.
10. When laying plywood on a wooden floor, choose fasteners that will be at least 3 times the thickness of the sheet.

Laying plywood on a wooden floor

To install plywood sheets you will need the following:

• roulette;
• jigsaw;
• screwdriver;
• screws and dowels;
• building level.

Laying plywood on a wooden floor starts from the central part of the room, and only then finishes niches in the walls and areas near columns and ledges. The material is first laid without the use of fasteners. After dividing the sheets into fragments, be sure to inspect the ends to exclude the presence of delaminations. If there are any, it is advisable to replace the sheet, since in the future a low-quality part will ruin the entire finish.

Having laid out the material on the surface in accordance with the diagram and observing expansion joints, the plywood is attached to wooden floor using self-tapping screws. The holes for them are made in advance, and the heads of the fasteners must be recessed into the wood. In some cases, plywood is mounted on a special adhesive composition, which must cover at least 80% of the material area.

By placing plywood on a wooden floor, check the evenness of the coating building rule, paying attention to the width of the damper joints. The plywood should lie horizontally tolerance is no more than 2 mm. Then the floor is tapped wooden hammer or a block to identify the presence of delaminations. You can identify weak points by the sound - it will be dull and booming. Having noticed this, the sheet of material must be dismantled and replaced with another fragment.

If plywood is used as a final covering, the final stage Its installation will involve sanding and opening with varnish. Sand the material with fine-grained sandpaper until smooth, and then cover it with transparent varnish or paint.

Laying plywood on joists

Installation of plywood sheets on joists is a labor-intensive and time-consuming process. For such work it is necessary to use material with a thickness of at least 15 mm. The installation process consists of several stages:

1. First, all the logs must be adjusted to the same level so that they form a single horizontal plane. When trimming the logs, their evenness is checked using a building level.
2. The next stage is insulation and soundproofing of the floor. The necessary communications and insulating material are laid between the lags.
3. After this, the installation of plywood boards begins. The joints between the sheets must coincide with wooden beams floor bases.
4. Having attached the material with self-tapping screws, the surface is sanded and cleaned of debris with a vacuum cleaner.

If a laminate is laid on top of plywood, then the subfloor is covered with a shock-absorbing underlay, which will level out small differences in height and serve as an additional heat-insulating layer.

Laying plywood on a wooden floor. Video

• Date: 09/20/2015
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New technologies for decorating rooms also affect floor coverings. In most cases, cork, laminate and parquet boards are used. You should know 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 your home, it is better to choose FK plywood; it is less toxic and well protected from moisture.

There are several methods on how you can do this. One of them is leveling the floor base with plywood. In order to carry out all the work correctly, you will need to know how and with what help you can attach plywood to a wooden floor. In addition, you need to know what surface preparation work will need to be done.

Advantages

The principle of leveling a wooden floor with plywood along adjustable joists.

It makes sense to use plywood to level floors, because it has the following advantages:

1. Low cost.
2. Adjacent layers are positioned perpendicularly, so the plywood sheets will have good strength in all directions.
3. Plywood sheets are produced large sizes, which makes it possible to perform accelerated installation over large areas.
4. Sheets of plywood can bend well without breaking.
5. Sheets of plywood are quite easy to transport.
6. Such sheets are unpretentious to use.

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Nuances when laying

Laying plywood on a wooden floor is especially important when plank floors dry out, become loose 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:

1. First of all, you will need to check whether the wooden floors are sagging along the joists. If there are deflections, then it is necessary to completely dismantle the floor covering and repair the wooden subfloor. If the problem is not the joists, then it is best to lay plywood on a wooden base.
2. It should be remembered that plywood should not be used where there are large temperature changes and high humidity. Plywood sheets are not suitable for bathrooms and unheated rooms. To check whether the floor has high humidity, you need to tightly lay a sheet of polyethylene measuring 1x1 m and leave it for 3 days. If on inside If there is no condensation on the polyethylene sheet, you can put plywood on the floor.
3. The plywood is laid dry with an offset so that at least 3 seams meet at one point. Individual sheets are adjusted to the size of the room, while you need to go around the protrusions and fill the niches. In the process of carrying out such a procedure, you need to remember that between the scattered plywood you need to leave a gap of about 9-10 mm. In the future, these gaps will be covered. There should also be gaps between the walls and the plywood, which will be covered with baseboards in the future.
4. To avoid mixing up the fitted sheets during the process final assembly, you need to number them and draw up a plan diagram.
5. It is best to cut plywood sheets into squares with sides of 60 cm. This way you can get a suitable number of damping joints. In this case, it will be easier to find delaminations that may not be noticeable in solid sheets.
6. Before final installation of plywood, it is recommended to thoroughly clean the base from dust and other contaminants. You can also perform priming, which involves treating the floor surface with a primer.
7. Plywood must be laid using glue. If glue will not be used, each sheet must be secured with self-tapping screws along the edges and diagonals. The pitch of the fasteners should be 18-20 cm. The distance from the edges should be 2 cm. The screw heads are recessed.
8. Fastening elements will have to exceed the thickness of the sheets in length by at least 3 times. For example, 40 mm self-tapping screws are suitable for 12 mm sheets.
9. After installation, the base must be thoroughly sanded. This can be done using parquet sanders and sandpaper with large grains.

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Preparation work

Installation of plywood on a wooden floor must be done correctly and using necessary tools. The technician must have experience with all the tools that will be used.

To lay plywood you need the following elements:

1. Screwdriver.
2. Electric jigsaw.
3. Building level.
4. Roulette.
5. Self-tapping screws.
6. Dowels.
7. Wood glue.
8. Plywood sheets.
9. Seal.

Before leveling a wooden floor with plywood, you need to check the base for suitability for use. In addition, you need to replace old boards and repair creaking elements. It is recommended to check the evenness of the base using a building level.

If the floor surface is not too flat, then it is worth determining the maximum difference in the base. If you need to smooth out small unevenness, you should use a floor underlay. If there are differences of more than 1 cm, you will need to lay the logs horizontally. They can be set using a water level.

The choice of plywood sheets will depend on the floor covering that you plan to lay. If you plan to lay carpet or linoleum, it is recommended to purchase sheets of thin thickness. If laminate or parquet boards will be laid, you need to purchase plywood with a thickness of 10 mm or more.

The thickness of the plywood sheets that are laid under the laminate or parquet board, must be no less than the thickness of the floor covering.

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Plywood grade

Before installation, 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, FB and FOF grades are used. For individual works Plywood of the FSF and FK grades is intended for construction.

FK brand plywood can be used in children's rooms or bedrooms, because in the process of its production glue is used without the use of phenols, as a result of which the plywood is harmless to human health. It has an average level of moisture resistance and is resistant to mechanical stress.

FSF grade plywood has an increased level of 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, however it does similar plywood toxic. This material is not recommended for use in living rooms.

Currently, sheets of glued wood veneer are actively used not only in the manufacture of furniture, but in finishing rooms, both inside and outside. Why do owners of private houses, cottages and apartments choose it when decorating their premises?This material has many advantages:

• low price (the cost of solid wood is several times higher than the cost of plywood);
• Not only a professional, but also a beginner can install sheets of this material;
• the external appearance of such material attracts attention; it does not need additional finishing (it is enough to cover it with varnish or paint);
• light weight (very convenient when working);
• not afraid of moisture.

However, this is not the entire list of advantages.

When choosing such a material, many people wonder how to fasten it, are self-tapping screws suitable for plywood or not?

Self-tapping screws for fastening plywood parts

How to fasten sheets of plywood?

There are many ways to fix this material. Which method to choose depends on many factors:

• First of all, the choice of fastening method depends on the quality of the sides;
• the surface to which they are going to install also plays a special role;
• You should also consider whether it is worth using fasteners at all or whether you can get by with glue.

Self-tapping screws for fastening plywood are most often used, however, in order to ensure high-quality and reliable fixation of the material, it is necessary to select them correctly.

Screwing fasteners into the product

For example, if you choose large ones, the resulting sheet will not be securely attached, and if you choose small ones, the coating will begin to move away from the surface over time.

So, in order to answer the question of what screws to use to fasten plywood, you need to know what this type of fastening is and what types of it there are.

Varieties and selection depending on the thickness of the panels

The self-tapping screw is fastener in the form of a threaded rod and a head, which is designed to make the screwing process faster and easier. Such fasteners are used not only for fixing metal sheets and solid wood. They are also used to fasten sheets of glued veneer, plasterboard, chipboard and plastic.

Can be selected to suit any sheet thickness

What are these hardware made from? For the manufacture of such fasteners, stainless/carbon steel or brass is used. The most popular and cheapest are hardware made of carbon steel with different types coatings:

• galvanized coating (such fasteners are silver in color and are used for internal/external fastening);
• with an oxidized coating they are black in color (used for fastening in rooms where the moisture level is normal);
• galvanized, golden in color, used both for fastening indoors and outdoors.

Types of hardware

There are:

• with regular thread (suitable for any material, including sheets of glued veneer);
• with threads with a frequent pitch (they are intended for fastening metal sheets);
• with a thread with a rare pitch (used when fastening soft material– plywood, plastic).

When making interior items from sheets of plywood, a screw-hardware – confirmat – is used as fastening. Most often, confirmat 7x50 is used to fasten wood material. To use such a screw, you must first make a hole in the material, the diameter of which is on average five millimeters (maximum eight millimeters).

To close the “caps” of the self-tapping screw (to give an aesthetic appearance), you can purchase special decorative overlays to match the color of the product being manufactured.

Covers to hide fastener heads

There are also self-tapping screws for concrete, which, as a rule, are screwed in without dowels.

Important! It is worth noting that before screwing the hardware into the wood, it is necessary to make a hole using a drill. The diameter of the drill must match the diameter of the fastener.

Fastening wooden slabs to the floor. Where to begin?

Before attaching plywood to the floor with self-tapping screws, it is necessary to perform a number of preparatory work:

1. To attach plywood to the floor with self-tapping screws, it must be thoroughly dried and cleaned of dust and dirt.
2. The surface is sanded using sandpaper. Special attention should be given to the edges.
3. Then the surface is primed using a special composition. This is necessary to close all microcracks.
4. Then the prepared sections of flooring are laid out over the entire surface of the floor.

Layout of slabs on the floor

How and what screws to use to attach plywood to a wooden floor? Fastening to a wooden floor is carried out using hardware with regular/rare pitch threads. Fasten hardware every fifteen centimeters around the entire perimeter, while stepping back from the edge by two centimeters, and diagonally.

Layout of sheets with approximate fastening markings

Important point! A small distance/gap (about two millimeters) should be left between the decking panels. You should also leave a gap between the wall and the plywood (about ten millimeters).

Using a spatula, mastic is applied to the over-primed area. In this case, care should be taken that the thickness of the mastic layer does not exceed 2 cm. A sheet of glued veneer is placed on top of the mastic.

What screws are used to secure plywood to the floor? It all depends on the thickness of the material. For example, self-tapping screws for 10 mm plywood should be chosen from ordinary carbon steel with a galvanized coating.

Important! The length of the fasteners should be three times the end of the material.

To ensure that the sheets of glued veneer are not damaged by a hammer blow and do not split, it is necessary to strictly follow the fastening technology:

1. A small hole is made through the tree at the base using a drill. It is worth noting that the diameter of the drill must be equal to the diameter of the screw.
2. The process of countersinking a hole. Due to this process, the caps of the fasteners are securely fixed and do not come out to the surface.
3. Once all the panels are attached, you can proceed to preparing them for finishing.

If the fasteners were selected correctly, in accordance with the diameter of the drill and their purpose, the result will be reliable coverage, which will not delaminate over time.