What is the best way to fix plywood to a wooden floor. How to lay plywood on a wooden floor: the choice of material, technology and stages of work. Floor plywood - protection, operation and storage

Plywood is often used to create flooring. Its flat surface is considered a good basis for laying the finishing material, and some types of plywood are also used as decorative finishes. 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:

Plywood is durable, it can withstand significant static and dynamic loads, while almost not deforming.
The budget cost of the material makes it an attractive and affordable option for most categories of citizens.
Long service life is another advantage of such sheets.
For all its strength, plywood is lightweight, which is considered an important indicator in the construction industry.
The surface of the sheets is even and hard, it is well suited for further installation of almost any floor covering.
Plywood is environmentally friendly, safe, does not emit harmful substances into the environment, and does not have an unpleasant odor.
The material is easy to process. It is easy to cut, it can be bent if necessary. Transportation of plywood is also not difficult.
Some brands of plywood look very attractive and can be used to finish the floor. Their processing in such a case will consist in staining or varnishing.
In terms of moisture resistance, modern plywood noticeably outperforms chipboard boards, which have high porosity, absorb water well and quickly collapse under the influence of moisture.

When choosing plywood for flooring, pay attention to its thickness. The best option an indicator of 12-15 mm is considered, but if the finish is heavy boards, then it is better to use thicker plywood sheets.

The subtleties of mounting plywood on a wooden floor

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

Plywood flooring on wooden floor

To install plywood sheets, you will need the following:

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

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

Having laid out the material on the surface in accordance with the scheme and in compliance with the expansion joints, the plywood is fastened to wooden floor using self-tapping screws. Holes for them are made in advance, and the caps of the fasteners must be recessed in the wood. In some cases, plywood is mounted on a special adhesive, which must cover at least 80% of the material area.

Putting plywood on a wooden floor, the evenness of the coating is checked building rule, paying attention to the width of the damper seams. The plywood must lie horizontally, the tolerance is no more than 2 mm. Then the floor is tapped with a wooden hammer or bar to reveal the presence of delaminations. You can determine the weak points by the sound - it will be deaf 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, final stage its installation will be polished and varnished. Sand the material with fine-grained sandpaper until smooth, and then cover it with a transparent varnish or paint.

Laying plywood on logs

Mounting plywood sheets on logs is a laborious and lengthy process. For such work, it is necessary to use a material with a thickness of at least 15 mm. The installation process consists of several stages:

First, all the lags must be adjusted to the same level so that they form a single horizontal plane. Trimming the logs, their evenness is checked with a building level.
The next stage is the insulation and soundproofing of the floor. Necessary communications and insulation material are laid between the lags.
After that, proceed to the installation of plywood boards. Joints between sheets must match wooden beams floor bases.
Having attached the material with self-tapping screws, the surface is ground and cleaned of debris with a vacuum cleaner.

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

Laying plywood on a wooden floor. Video

Leveling floors before rough and fine finishing directly depends on the height and area of the room. But this process is also influenced by several other factors. What will flooring, in what range of temperatures and humidity the floor will be, how much it is planned to spend on Finishing work, what are the attitudes of tenants in aggressive adhesives and solutions, etc. All of the above questions make the choice of floor leveling material not so simple. To date, homegrown builders and recognized masters of repair have not tried anything! Here we will talk about plywood, which is excellent material for flooring in residential and non-residential premises. plywood sheets different thickness and format are used both for rough finishing before laying laminate, linoleum or parquet, and for finishing the floor in cottages, in the country and at home.

How to use plywood

Initially, it may seem that plywood sheets are fragile and cheap. But practice shows that this material is many times superior to MDF, chipboard, OSB, fiberboard and other recycled materials. And there is no need to ask a difficult question,. The main advantage of plywood lies in the specifics of its production. There is no gluing of the residual mass of wood and a liquid binding substance here. Each plywood sheet consists of several layers of working wood. And due to the fact that these layers have multidirectional fibers, the floor is durable and reliable. You can read about what it is in the article.

You can find out how much 1 sheet of moisture-resistant plywood costs from this

The purpose of plywood flooring is to achieve three main tasks.

"Smoothing" of irregularities and preparation for a final coating.
Ensuring the required level of thermal insulation.
Protection parquet board from moisture.

Of course, there is also plywood for finishing the floor. But we will not consider this option because of its specificity and low prevalence. They lay plywood either directly on the floor, or raise it above it with the help of logs - special lighthouse bars.

What are specifications moisture resistant plywood can be found in this

On the video - the thickness of plywood on the floor:

Methods for laying sheets on the floor

Put on logs

If the differences in height on the floor are quite significant (from 5-10), then plywood can be laid and fastened to special logs. They not only allow you to achieve a perfectly flat floor, but also provide an air cushion for thermal insulation and waterproofing, and then it is easier to select or other finishing material.

Lags are used almost everywhere. The only obstacle on this path is the low height of the room, since laying plywood on logs “eats” up to 10 cm of room height.

Manufacturers and prices

When choosing a finish coating, it is useful to know.

The prices for their products are about the same. Therefore, experts recommend, first of all, to determine the type of plywood sheets that will be used for flooring.

Leveling the floor with a plywood "substrate" is a common method of dealing with unevenness, cold and operational features of the room. Depending on the tasks used different types plywood and their thickness. If you are just looking at the material, it is useful to know and.

You can see a photo of OSB plywood in this particular

In each specific case, a professional needs to do an assessment of the needs in one type or another.

Plywood is several layers of thin glued wood - veneer. As a rule, the number of these layers is odd and multi-layered - at least three, and each layer of veneer is superimposed perpendicular to the previous one. Plywood in home repairs is used quite often. Usually it is laid as a floor covering as a convenient one, as a base for laminate, parquet, ceramic tiles, linoleum, carpet, etc. At the same time, plywood has a number of useful qualities.

This is a very strong, aesthetic and durable coating that will serve you for a long period of time.

Such material is very resistant to temperature changes.

Flat and smooth. Using plywood, we perfectly level the floor base.

Plywood insulates the floor to some extent.

High environmental friendliness.

Allows you to level the annoying creak in the wooden floor.

Installation of plywood, although somewhat laborious, is relatively simple. You can also do plywood laying on your own.

Moisture-resistant plywood often withstands room flooding.

It is very easy to dismantle and change it on occasion.

Traditionally, plywood is laid on logs, on a plank floor and on a concrete screed. Consider all three methods separately:

But before proceeding directly to the repair, it should be noted that the plywood must "get used" to the room temperature. To do this, it must be kept from a day to 7 days in a horizontal position in the room where the repair is planned. It all depends on the temperature in the room and the warehouse / store where the plywood was before. If it is approximately the same, a day is enough to get used to it, if the difference is up to 5-8C, you need to let it lie down, at least 3 days, more than 8-10C - a week.

Laying on a concrete screed

This is the most difficult method of the above. What should be done:

Laying plywood on a wooden floor

In principle, here the technology is the same as when laying on a concrete screed. There are only small nuances.

In all cases, once the plywood has been fixed, it can be sanded down to remove any unevenness, adhesive residue, and make the surface of the plywood more suitable for attaching the final finish. To do this, use a coarse abrasive (emery) or a special grinder. Estimate differences using a long rule or level. In addition, if necessary, to enhance the aesthetics, the laid plywood can be varnished.

That's all. Now you can proceed to the installation of the main finishing surface.!

Plywood can be called one of the most universal materials that were invented by man. This raw material is widely used in the construction industry. In terms of price-quality ratio, plywood has no competitors. Most often it is used for flooring and floor repair. However, the high functionality of this material also determines a large number of methods for working with it, so you need to consider all the nuances in detail.

Types of plywood

Sold in hardware stores a large number of different types plywood. V repair work often used raw materials of such varieties:

FC is a moisture-resistant material glued with carbamide resin, without volatile and toxic compounds. It is strong and resilient, it can be equated to BS aviation plywood.
NSh - unpolished material glued with casein glue. This option is the most budget. Before installing a parquet board or other solid material you need to process the sheets with sandpaper.
Ш1 - the main raw material for the subfloor. Sanding done on one side. The adhesive composition is also casein
Ш2 - sanded on both sides, glued with casein glue. It can be used for very loaded areas in dry rooms. It acts as a substitute for the FC variety.

The ideal material has not yet been invented and plywood, for all its advantages, has its drawbacks. This material is made from wood, which is known to be a hygroscopic material. For this reason, plywood sheets are not used in damp rooms: prolonged contact with humid air above 68% causes damage to the material. At temperatures below 18 or above 27 degrees, the sensitivity of the material to the level of humidity increases. In the range of less than 16 and above 35 degrees and humidity at 85%, plywood sheets will begin to peel in 40-60 days, with the exception of the FK grade. Ordinary plywood is not suitable for use in the kitchen, balcony, pantry and bathroom.

Is it possible to improve the characteristics of this material? A high level of stability can be achieved by processing with polyvinyl acetate (PVA) putty. This is the most a budget option. Sheets are covered on one side until spots are formed on the opposite side. The procedure is repeated several times, after which you need to dry it, leaving it horizontally. Drying takes a long time - at least three days at room temperature. When this composition dries, you need to treat the material with an antiseptic-fungicide. Higher strength can be achieved with acrylic varnish. It is applied in two layers, and the second - only after the drying of the first.

Before talking about how laying plywood on the floor, it is worth noting her getting used to the room. Plywood, as a natural raw material, needs time to get used to the conditions of use. The acclimatization period depends on fluctuations in temperature and humidity levels:

if the conditions at the place of purchase are similar to those in the house, then one day is enough
in case of temperature difference from 2 to 8 degrees - it will take three days
and if the difference is more than degrees - you need to leave the material alone for a week.

Laying plywood on a wood floor is a great solution if the old plank floors are dry or creaky. With the help of plywood, it is possible to replace the old coating in a short time, at the lowest cost and with a high level of reliability. First of all, you need to make sure that there is a deflection in the wooden floors along the logs. If there is a deflection, you will need to completely disassemble the floor covering and carry out its repair or replacement. If the logs are in good condition, then plywood flooring is done directly on the old base.

How to check if the humidity level in the room is normal? It is necessary to put 1x1 meter polyethylene on the floor and leave it for three days. If after this time no condensation forms on the inner surface of the polyethylene, then you can proceed with the installation of plywood. It is laid “dry” with such an offset that no more than three seams converge at one point. The material is adjusted to the dimensions of the room, but do not forget that between the sheets it is necessary to leave a gap of 8-10 mm. In addition, a gap of 15-20 mm must be left from the extreme squares of plywood to the wall. These gaps will not be visible, they will be covered by skirting boards. It is very convenient to work with numbered sheets, based on a simple scheme from the placement. When choosing a material, remember that plywood from 12 to 18 mm is suitable for the floor. Only in the case of a perfectly even base, you can take sheets of 10 mm. If the finishing material is a massive board, then plywood must be laid at least 15 mm.

For greater convenience, experts recommend cutting plywood into squares with a side of 60 cm. Thus, you will get the optimal number of damper joints. Plywood sheets are placed only on a clean, even base, free of dust and debris. For greater reliability, the base is treated with a special primer.

Installation of plywood directly on a concrete base is carried out using a special adhesive composition. How to choose glue? When buying, pay attention to such factors:

if children or allergy sufferers will live in the house, water-based glue is preferable. It is odorless and simply diluted with water. It also works well as a primer. When using such glue, dowel-nails are needed. However, this glue takes a very long time to dry.
there are solvent-based adhesives. When choosing such an adhesive, remember that the concrete screed needs an additional coating with a primer. The drying period of this glue is 3-5 days. Here you will also need dowel-nails. Glue has a strong unpleasant odor
two-component adhesive composition dries in a day. Its main advantage is that it does not need additional fastening. If construction work needs to be carried out as quickly as possible, then this glue is the best option, because it, together with an epoxy primer, can be applied to a wet screed.

Before laying plywood sheets, they need to be cut into squares of 60x60 cm or 75x75 cm. This procedure contributes to the creation of multiple seams, which in the future will lead to adjustment of oscillations temperature regime as well as humidity levels. When installing the squares on a concrete base, you need to ensure that all 4 seams do not converge in one corner, but are displaced.

Sequence of work:

with a notched trowel, place the adhesive in a layer of 2 mm on a clean substrate
put numbered squares on top. Roll them out to get rid of excess air.
to securely fix the squares, you should use self-tapping screws with plastic dowels, which should be three times longer than the thickness of the sheets. The screw head must be hidden.
to obtain a flat surface, you need to carefully sand the plywood at the end of installation.

After all these works, the concrete floor will be fully prepared for laying any finishing material.

Laying plywood on a wooden floor

plywood attached to wooden base two ways:

screwed directly onto the base
mounted on installed logs.

How to lay plywood on the floor? At the core right choice lies a preliminary assessment of the situation and the study of the surface. If there are no depressions, then the sheets can be fixed immediately. With the help of plywood you will level the floors.

Installation on logs is carried out mainly in cases where the floor is strongly curved or has significant defects. The flooring is successfully carried out both on nails and on self-tapping screws. In both cases, a high quality coating is obtained. In this work, it is preferable to use whole sheets of plywood.

General installation rules:

checking the stability of the base before starting installation. If deflection is detected, the damaged area must be replaced.
it is impossible to lay plywood in rooms with high humidity or sudden changes in temperature
numbered and fitted sheets will greatly facilitate the installation process
the optimal sheet thickness is 1.5 cm
Before starting plywood fasteners, the surface must be thoroughly cleaned and primed.
fasteners must exceed the thickness of the material at least three times, for example, for sheets of 1.2 cm, you need to take self-tapping screws 4 cm in length
grinding is the final step.

During the execution of all work, do not forget that if all work is done correctly, the result will delight you for a long time.

The scope of this sheet material is quite extensive. When doing work on your own (construction or repair), plywood is often used in arranging the floor - both for leveling it for the finish coat, and for mounting it on logs of light flooring for further painting or applying varnish. Regardless of the goal pursued by the home master, the technology is identical in both cases.

And given the exact geometry of the plywood sheets, the simplicity of their cutting and low weight, all activities for installing the floor from plywood along the logs at each stage can be done by hand, without resorting to the services of various advisers and assistants.

By itself, the process of arranging a plywood floor will not cause any difficulties even for a non-specialist. The main thing in this work is competent preparation for it. The quality and durability of the coating directly depends on the choice of appropriate materials. For those who are really interested in the final result, the author strongly recommends that you carefully study the information below, and only then master the nuances of installing plywood along the logs.

Sheet stacking scheme

You should start with this. In order to draw a plan of a specific room on a sheet, taking into account all the features of its configuration, you do not need to be a specialist. The main thing is to maintain the scale. After that, measurements of all the linear parameters of the room are made and put on the diagram. It turns out a drawing that will be needed to calculate the required volume of purchase of the required materials.

What is the feature? Plywood sheets have the correct geometry, and go on sale. Mainly for domestic use samples are purchased 244 x 122 or 152.5 x 152.5 (cm) - this is the standard format. There are more overall products, and when finishing large areas, it is much more convenient. But the question arises - how to transport it? For example, with a sheet length of 3.6 m (these are also sold).

After drawing up the plan of the room, it remains only to apply a “grid” on it, the cells of which are projections of each sheet. The task is simple - to draw up a diagram of their laying in such a way as to engage in cutting as little as possible. For those who are first faced with the issue of arranging floors on plywood logs, it is worth explaining what such careful planning gives.

The amount of waste is reduced, therefore, construction (repair) is partially cheaper. A zealous owner will appreciate this.
When it comes to doing this or that technological operation with your own hands, it is understood that home master uses household tools. Does every home have a jigsaw? So, you have to cut plywood with what is at hand. For example, a hacksaw. And this is both time and low quality of the cut.

What to consider?

When drawing up a plywood laying scheme, it is necessary to arrange all the sheets so as to cover the maximum possible area with them, and it is with whole samples. Naturally, there will be separate sections for which you will have to cut (in size) fragments. But in this case, you can also purchase the so-called substandard. It is in every building / materials store and is sold at bargain prices. As an option - buy sheets of plywood of smaller sizes (there are also such).

Such careful preparation will significantly reduce costs. By the way, this applies not only to plywood (the number of sheets and their sizes), but also to logs. They are also characterized various lengths, so you have to deal with them.

Choice of plywood

By variety

One of the tasks of do-it-yourself work is to achieve maximum savings. From the same point of view it is necessary to approach the acquisition Supplies. In terms of quality / cost per sheet for arranging floors, the best are. Both of them are moisture resistant, are sold in a large assortment, have identical linear dimensions and sample thickness. What is the difference?

FSF costs 1.5 times cheaper than FC.
In the manufacturing process of both plywood, adhesives are used to hold the veneer layers together. But if the preparation for FC does not contain toxic components, then they are present in the glue for PSF (formaldehyde). That is why the last modification is recommended mainly for external work, since when the temperature rises environment harmful substances begin to be released from such plywood.

How to proceed? If the floor is arranged along the lags in a residential area, it is unambiguous to focus on the FC sheets. For installation in unheated utility rooms (sheds, outbuildings), cheaper plywood with the FSF marking is also quite suitable.

Thickness

The purchase of plywood for this parameter is complicated by the fact that the following points must be taken into account. Firstly, the interval between the lags, which is selected depending on the characteristics of the arrangement of the floor. For example, how and with what it is supposed to be additionally insulated. Secondly, it is possible to increase the strength of the flooring not only by increasing the thickness of the sheets or reducing the distance between the lags, but also by laying plywood not in 1, but in 2 layers.

For a single-layer installation scheme, it is worth purchasing sheets with a thickness (mm) in the range of 15 - 18 (depending on the expected load on the floor). Reducing this value will not ensure the reliability of the coating, increasing it will complicate the work with sheets (first of all, cutting them) and increase the weight of the entire structure to be mounted (and this is an additional load on the floor).
If it is planned to lay plywood in two levels, then samples with a thickness of about 8 - 10 mm can be purchased.

By grade of plywood

As a rule, when arranging floors along logs, cheaper sheet material is purchased. After all, all its flaws are reliably hidden by the finishing. The main thing is that the samples do not have significant defects in the form of chips or emerging cracks.

In some cases, the owner leaves the flooring as it is, covering the plywood only with varnish. With a similar organization of the floor, the purchase of sheets with a grade below 2/4 is impractical. What is the feature of this product? GOST allows the presence of defects on its surface, but only on one side. When arranging the floor along the logs, such plywood (2/4) is the best choice.

According to processing

It is appropriate to note such a characteristic of the sheet material. In order to optimize costs, you should pay attention to plywood, the abbreviation of which contains the designation NSh (unsanded) or NSh1 (with one-sided sanding). Accordingly, what is better to buy depends on how it is planned to finish the subfloor further. If you only paint (apply varnish) - then NSh1. In other cases, cheaper sheets with the designation NSh are sufficient.

Log selection

By material

There are only two possible options - metal or wood. If we consider from the point of view of ease of installation, weight, correct geometry and a number of other parameters, then the conclusion is unambiguous - it is better to purchase metal logs for arranging the floor. But such a judgment does not take into account all the nuances of operation.

In any room, the microclimate changes, sometimes quite dramatically. First of all, this refers to temperature. Its differences cause deformation of materials. To make the design as stable as possible, when combining several different types of elements, they are selected according to expansion coefficients; they should be as equal as possible.

What is a plywood joist floor? Sheets are glued and pressed layers of wood veneer. Therefore, it is better to choose a wooden base on which they are supposed to be fixed. That is, a beam or a thick board mounted on an edge. No matter how convenient metal is to work with, it is unlikely that warping of the floor will be avoided with such lags. If not immediately, then in a couple of years it will definitely manifest itself.

By type of tree

The specifics of the room (dry or wet) does not yet give a complete understanding of the conditions in which the wood will be. Logs are mounted on the ceiling. What is under it - a heated room on the ground floor, a basement or something else? Options may vary. But the probability of rotting, deformation of the material in any case cannot be ruled out.

What is recommended? Larch is the best solution. This coniferous wood is not only resistant to dampness, but unlike other similar species, it does not tar so intensively when the temperature rises, and when wet (in the future) it only gains strength. No wonder it is her experienced craftsmen who use it when laying the lower crown of the log house. In addition, the price of lumber is quite acceptable.

Geometry

It's short here. All joists must be absolutely straight. Even the slightest distortion is unacceptable. Otherwise, not only their alignment when laying on the base will be complicated. Even slight mismatches in the upper cuts in height will lead to the fact that the plywood floor will turn out to be uneven. It is extremely difficult to fix such defects of it, and even in several places, with your own hands.

The optimal cross-section of the beam for the log (mm) is 100 x 50.

According to wood moisture

You need to purchase for the log only lumber dried in production (with an indicator not higher than 12%). It costs more than natural moisture products, but it is here that the savings are not justified. It is unlikely that it will be possible to achieve proper drying of wood on your own - this is a complex process that requires time, a suitable place, and competent organization.

Choice of fasteners

The plywood floor is good because it is easy to repair by replacing the sheets. Therefore, as fasteners - only self-tapping screws (for wood).
Since any floor is necessarily subjected to wet cleaning, the hardware must be made of stainless metal. There are enough galvanized self-tapping screws on sale.
Leg length. It is selected depending on the thickness of the plywood sheets and should exceed it by about 2.5 times - this general rule for work related to fixing materials on the basis.

Plywood floor on logs - work procedure

Foundation preparation

The main goal is to eliminate defects in the floor and ensure its high-quality waterproofing. If the floor is arranged along the logs in a new house, then the task is greatly simplified. It is enough just to lay a p / e film (thickened) on the base with the expectation that its edges wrap onto the walls, and fix the sections with construction tape. The excess above the floor - the height of the lag + the thickness of the plywood sheets + another 2 - 3 cm. The protruding film will subsequently be covered with a plinth.

If the leveling of the subfloor is carried out in an already inhabited room, then there are two possible options.

Complete dismantling of the entire structure and work from scratch.
Removing the flooring (with the lag remaining) and waterproofing the floor with penetrating compounds.

The feasibility of a particular solution is determined by the state of the lag and the base on which the installation is carried out.

Installation of the supporting frame

Many questions arise regarding the interval between lags. Partially about what needs to be taken into account (plywood thickness, room area, installation scheme) has already been said. But the main criterion is the dimensions of the sheets. They are laid on logs so that the cuts coincide with the longitudinal axis of the guide.

Therefore, you should focus on the distance between the lags within half a meter. If it is required in some areas, then additional logs are mounted. Actually, the drawing is also drawn up in order to determine their optimal placement in the room. As a result, the supporting structure should look something like this.

What to consider:

A wooden “shoe” is placed under each rail (from pieces of MDF, OSV, fiberboard, trimming a thin board). It is easy to fix it on the ceiling. What is the advantage of such a solution? Firstly, there will be good air circulation under the plywood floor, which will partially prevent the formation of mold. Secondly, with this method of installation, it is easier to align the upper sections of the log.
Work begins at opposite walls. Along each, with an indent of 3 ± 0.5 cm, one log is laid. They are aligned in a horizontal plane, and later serve as a guide for mounting the rest.
To achieve maximum alignment of the lag with your own hands, it is advisable to make a special device. The device is simple - a long rail, in the middle part of which a level (building) is fixed. Even better is to buy (or rent) a level. Then there won't be any error.

Floor insulation

From the point of view of "easier, faster, cheaper" - pour expanded clay between the lags or lay mineral wool mats. The work is so simple that it is not worth considering this issue in more detail.

At the same stage, engineering communications are laid (if necessary) - TV lines, Internet, and so on.

Fixing plywood sheets

Work feature:

First, a “fitting” layout of the sheets is done. After they are aligned and adjusted, the installation points of the fasteners are marked.
Each sheet is additionally processed (edges are cut at an angle) and holes for self-tapping screws are drilled.
Countersink. It is mandatory, since the fastener caps must be recessed into plywood after screwing it in.
Placement of sheets. They are mounted one at a time, starting from any of the corners of the room. After alignment with the lags, it is advisable to make “channels” in the beam with a thinner drill. Then the leg of the self-tapping screw will enter the wood quite easily. If the installation is carried out with a screwdriver, then this can be neglected. The main thing is that the fasteners "went" strictly vertically, without distortions.

The figure shows an approximate scheme of their laying.

What to consider:

The placement of self-tapping screws depends on the dimensions of the plywood. Mandatory fastening - around the perimeter of the sample. But the additional fixation is determined by its size. For large-format sheets - according to the scheme crosswise, for small fragments it is enough only in the center.

To reduce the so-called “shat” of sheets, it is worth putting strips of roofing material under them (on the logs).
Plywood is laid so that when it is joined, the bevels form a groove. It is easily filled with sealant, completely closing the resulting gap. This increases the hydro, heat and sound insulation of the floor.
To mask the hats of fasteners, special compounds are also used. They are on sale and various shades. If the plywood is varnished, then it is not difficult to match it to the tone.

If plywood is laid in two layers, then its fastening is done as follows.

The final stage is the cleaning of all joints. As a rule, it is enough to go over the seams with sandpaper to remove excess dried sealant. And then - according to the plan: coating with varnish or paint, finishing with other materials. The main thing is that the plywood floor is completely ready.