Underfloor heating under linoleum on a wooden floor

Laying plywood on a wooden floor

Before the final laying of a row of floor coverings, the floor must be leveled. To do this, you can successfully use plywood. In general, the steps involved in laying plywood before laying the final coat are not difficult. The plank base is leveled by cutting a layer of board.

Putting sheets of plywood correctly should be in a checkerboard pattern, i.e. simultaneous joining of no more than 3 seams is allowed.

Plywood sheets should be laid, observing technological gaps. So, the gap between the laid plywood sheets should be 2-3 mm, and between the walls and plywood - at least 1 cm. further preserved in the final coating and decorated with an insert.

Plywood sheets should be laid, observing technological gaps

To screw plywood sheets:

Self-tapping screws are used;
Self-tapping screws are located at a distance of 15-20 mm from the edge of the sheet;
Mounting comes in increments of 25 to 30 cm.

Installation of plywood using self-tapping screws is carried out so that the heads of the self-tapping screws are recessed into the surface of the sheet. The number of screws is approximately 5-6 pcs. per 1 m 2. It is also necessary to fasten the screws along the diagonal of each sheet. Leveling the floor with plywood, according to various sources, can be carried out with floor level differences of no more than 6 cm. In general, to create a flat floor surface, various types of plywood are used, up to 18 mm thick.

Method 1. Mounting on an old wooden floor

When laying plywood on a wooden floor, there are many options for fixing sheets:

on self-tapping screws;
on glue;
for liquid nails.

Among the adhesive compositions, water-based glue, a two-component composition, mounting glue and bustilat are distinguished. However, self-tapping screws are preferable.

Materials and tools

For the successful installation of plywood sheets, the following tools and materials will be required:

plywood sheets;
jigsaw;
level;
roulette;
marker;
self-tapping screws;
screwdriver;
substrate;
construction vacuum cleaner or broom.

You may also need a grinder, roller and primer, glue and sealant.

Floor preparation and priming

Installation of plywood on wooden floors is carried out only if the height difference when checking the level is no more than 1 cm. In this case, a substrate compensating for unevenness and adhesive tape will also be required, which will need to glue the joints of the strips of material.

Check the condition of the floors. Strengthen creaking and loose floorboards, replace rotten and damp ones. Do not try to restore boards with traces of mold, damage, attacked by rodents. They must be removed and the room ventilated.

Removing skirting boards, inspecting the condition of the floor

Sweep dust and dirt from the floors with a broom. If desired, go over with a wood primer twice for better adhesion of the materials. And dry the base for at least 16 hours.

Marking and cutting

Saw plywood only on a rigid base

Plywood sheets are sawn so that the number of joints is minimal, taking into account damper joints of 3-4 mm between sheets and 8-10 mm between plywood and the wall. This will help to avoid swelling of the sheets, since during operation, under the influence of the microclimate and temperature fluctuations, the workpieces will increase in area by several millimeters.

Laying plywood sheets

Leave a gap between the wall and plywood

Cutting is done with an electric jigsaw, while the ends of the workpieces are carefully inspected for delaminations and polished.On large areas, for ease of installation, plywood can be cut in squares of 50x50 or 60x60 cm. This technique will help to more accurately level the surface and eliminate possible laying defects.

The sawn sheets are numbered, and similarly to their numbers, a schematic arrangement of the blanks is drawn on a wooden base.

Leave the vent open

plywood laying

Mounting blanks has several features.

If necessary, a substrate is placed on the old wooden coating, the strips are glued together with adhesive tape.
Holes for self-tapping screws are drilled in advance, and then countersunk with a slightly larger diameter drill.
Self-tapping screws are sunk into plywood sheets.

Carefully sink the hats of self-tapping screws or dowels

Upon completion of installation, you should check the quality of the coating, remembering that the ideal gap between the level and plywood is 2 mm, the maximum is 4 mm.

How to lay underfloor heating on plywood

Plywood is the most versatile material. It is used in construction everywhere, from the construction of formwork when laying foundations and ending with the production of cabinet furniture for the home.

First of all, plywood is a sheet material made from natural wood, which is obtained by cross-linking sheets of wood veneer. There are three or more such sheets. Various types of wood are used: pine, beech, oak, linden and others. Moreover, it is customary to say that plywood is made from the same wood veneer from which its front surfaces are made.

Plywood floor installation

Plywood floor in the interior

Raw plywood floor

This material is used in the construction of an intermediate base for underfloor heating. If the main floor is made of piece parquet or parquet board, which must be fixed with glue and self-tapping screws, then plywood flooring is a must. Experienced craftsmen recommend installing an intermediate plywood floor also for subsequent coating with laminate or linoleum. In this case, plywood will perform the important function of a moisture and sound insulator.

Benefits of plywood flooring material:

material strength,
environmental cleanliness,
high thermal and sound insulation properties,
resistance to excessive moisture,
ease of installation and low labor intensity of work,
cheap cost of material and construction work.

Types of plywood for flooring

For the repair of apartments, plywood of various grades and varieties is used. It is classified according to the degree of moisture resistance and is divided into grades, from the first grade to the fifth. First grade plywood is made from birch, beech and oak, only wood without knots is taken. Such first-class plywood is used to make furniture. Plywood of grades 2 and 3 is just used as a secondary material for underfloor heating floor coverings, such as parquet, parquet board, laminate and linoleum.

Underfloor heating on plywood

Unlike the conventional technology of laying underfloor heating, laying on a plywood base is carried out without fixation. Floor sheets with this technology are connected using metal fastening brackets, and not with dowel screws. This technique allows the wood veneer to expand with increasing air humidity and prevents the formation of cracks and blisters. For more details on how to lay plywood, look at the photo.

There are several ways to install an intermediate plywood coating:

laying on a concrete screed: sheets 12 mm thick are used,
on logs made of wood: in the presence of various communications or other interference, thicker sheets are used, 20 mm or two sheets with a total thickness of about 20 mm,
on wooden floors: you can use plywood of any thickness.

What to look for when choosing an adhesive

There are three types of adhesives used: water-based, alcohol-based and two-component adhesive. Each of them has its own advantages and disadvantages.Aqueous glue is odorless, but contains water, alcohol glue has a pungent odor and is also flammable. The two-component adhesive dries quickly and requires skill to work with it. For plywood flooring, choose alcohol-based and two-component adhesives.

When laying plywood, the sheets must be cut into four pieces each and laid in a checkerboard pattern. Such a campaign allows you to avoid excessive stress in a single sheet, the more thermal seams, the more resistant to deformation the coating. The gap between the sheets is 5 mm, along the walls and heaters - 1 cm.

Laying an intermediate floor under linoleum and laminate

When choosing a material, you must be guided by the following recommendations. The plywood sheet must be thicker than the face covering and sanded on one side. Plywood is laid with the treated smooth side up, and linoleum or laminate is laid on it.

For residential premises, it is better to choose an environmentally friendly brand of material with an average degree of moisture resistance - FK.

Underfloor heating under tiles

Tiled floors can be cold. To cope with this disadvantage, it is recommended to lay an intermediate plywood floor under the tiles. The surface before laying the tiles must be cleaned of saws and sanded.

Best Answers

Tatyana is his own master48:

you will have to isolate it anyway. A warm floor, even a film one, is laid on a neutral surface, a screed is made on top either with self-leveling floors or sand cement, depending on which coating. . Under the laminate, we laid floors from OSB boards. the floor was laid on a p / e film, a film and a screed on top. This instruction was sent to us by the seller of warm IR film floors. In principle, if the floor is already laid and covered with plywood. then it turns out possible. Just be careful not to get moisture on it.

Nikallas Grunge:

better on OSB, but depending on how thick the plywood is.

Odessite:

If you want a fire, then yes.

andrey ruban:

What's the point??? Plywood will warp anyway!

Dmitry Arkadievich:

on plywood, first insulating material such as "isolon", "unifol", and then a warm floor

laconic:

Laminate, in theory, is also combustible. This time. There are all sorts of electric floors now. As a rule, most are certified, and this is complete fire safety for you. Can.

boy:

By no means!

Uncle from the Future...

Can. . but only not cable but film - PLENs. . Infrared underfloor heating...

Laying tiles on plywood. How to lay tiles on plywood

Before laying tiles on plywood, you need to prepare the base. Laying tiles on plywood involves the use of plywood laid in two layers so that the tile is evenly light on the base and does not peel off. Thus, the minimum thickness of plywood is 2.2 - 2.8 cm. Even better, to increase the overall strength, plywood glued in two layers is suitable. In addition, plywood should be very tightly fixed to the base to minimize deformation.

Foundation preparation

Plywood needs to be sanded and cleaned. Any surface under the tile must be flat. Two coats of primer are applied to a perfectly even and smooth surface. After you apply a layer of primer, you should wait until it dries for five hours, then the second layer in the same way. If tiling is done in the bathroom, then the plywood must be treated with a special waterproofing solution before applying the primer.

Glue should be chosen one that is designed for problem surfaces (plywood, drywall). Before purchasing, read the instructions to make sure that this mixture is suitable for working with plywood surfaces and your type of tile. In addition to traditional tile adhesives, special two-component polyurethane adhesives can be used.

Laying tiles

Laying tiles should start from the second row, since the first row will be cut to the desired size and it fits last. The first tiles are recommended to be installed on the farthest wall of the room. The horizontality of the laid tiles must be constantly checked with a level.

For some time, while the glue has not hardened, the tiles can be adjusted to achieve the desired result. To accurately align the seams between the tiles, crosses are installed. The size of the joints, as a rule, is 2-3 mm, but if the room has high humidity or constant temperature fluctuations, the joints can be increased to a size of 5 mm.

The adhesive mixture dries within 2-4 hours, therefore it is better to prepare small portions. To stir the glue, use a special mixer to achieve a uniform adhesive mass. Tiling is also done on a small area at a time within 1 sq.m. Glue applied to the surface of plywood and tiles will begin to set in 20 minutes. Therefore, all manipulations for laying and fitting tiles must be done during this time.

The final step is grouting, but in this case it is no different from the usual tile laying procedure.

Step by step instructions floor preparation

Work begins with cleaning the floor from dirt, dust, household and construction debris, and remnants of previous coatings. To exclude moistening of wooden elements from below, a layer of roofing material (roofing felt) or polyethylene film is laid on the floor surface. The film is applied to the entire surface with an overlap of 15-20 cm. The joints of the film are fastened with construction tape. If the film thickness is small, it is possible to produce flooring in 2-3 layers. Such flooring serves as a waterproofing.

Before installing the lag level, the horizontalness of the floor is checked. The marking of the installation sites of the beam is carried out and parallel lines are drawn in the middle of the future lags. Usually the beam is installed on linings. For them, plates from pieces of board or plywood are used. The recommended size of each such lining is: width - 100 mm, length - 200-250 mm, thickness - at least 25 mm. Wooden linings with the help of anchors are attached to the floor over the waterproofing along the marked lag installation line. The level is controlled so that the height of the floor along the lining is the same over the entire surface. If it is necessary to adjust the height, pieces of roofing material or linoleum are added.

To prevent the formation of mold in the future, all wooden parts and logs are treated with an antiseptic.
For the convenience of installing the floor, beacons are sometimes used. As beacons, you can use screws (self-tapping screws), which correspond to the height of the lag in terms of the height of the cap. Such beacons, screwed evenly over the floor surface, during the installation of the beam will help control their height and their pressing force or the need for additional gaskets.

Features of use and fire safety

When choosing any system that is associated with power supply and wood structures, it is necessary to take into account the characteristics of this material. Most often, in the process of designing a warm floor system with a wooden one, one has to face such difficulties:

Combustibility of the material: the wood should not come into contact with an open fire, it should not be allowed to overheat, which can happen in the electrical system during a short circuit.
Shrinkage: When a tree overheats, it loses moisture. At the same time, it becomes smaller in size, cracks, and very often becomes simply unusable.
Low thermal conductivity. This must be taken into account when covering underfloor heating systems with natural wood. In such situations, the heat is poorly distributed throughout the room and does not heat it up to the optimum temperature.

How to make a water / electric underfloor heating under a wooden floor an effective source of heat without these problems?

To solve the issue of fire safety, only those systems that strictly comply with all the rules and regulations of electrical and fire safety should be used.

Also, special attention must be paid to installation. All contacts must be insulated according to the requirements for installation technology

For a warm floor on wooden logs and under a decorative coating of identical material, it is allowed to use all modern electric heating systems: infrared film, cables, mats, rods. You need to follow these rules:

the temperature regime of a warm floor under a wooden covering should not exceed 27 ° C;
you need to ensure that there are no sharp jumps in temperature for a short time period. During 24 hours, the temperature may fluctuate by up to 5°C;
The heating cable must not come into direct contact with wood.

Popular types of plywood used for renovation

Sheets produced by the industry are classified according to various criteria:

wood used;
presence and method of impregnation;
grade;
number of layers;
surface treatment;
moisture resistance.

Brand	Degree of moisture resistance
FSF, FSF-TV	increased
FSB, BFS, BFV-1	high
BP-A, BP-V, BS-1	above average
FBA, FC	small

For repair work, when the part of the structure made of plywood is hidden from view, it is recommended to use moisture-resistant plywood of grade II or III. The sheet must be at least 10 mm thick, but the recommended value is 14-22 mm. A thinner one will not cope with the load, and too thick one is inconvenient to use.

Thickness and plywood

The number of layers does not matter. If possible, you should purchase sheets sanded on both sides.

If possible, before starting work, the plywood should be dried for 2-3 weeks. The sheets are dried vertically at a temperature slightly above room temperature.

We bring plywood into the room

You can increase the strength of plywood with several layers of acrylic varnish.

48 hours before the start of work, the material must be brought into the room where it will be installed, and laid horizontally. There are two ways to lay plywood.

Plywood advantages and disadvantages of the material

Pressed sheets are an excellent material for rough and primary work. They are inexpensive, easy to transport, easy to install and are good at eliminating small differences in floor level. Often, it is on plywood that they prefer to put linoleum, parquet board or laminate, since it has the following advantages:

laying sheets significantly reduces the time of preparatory work before installation of the final finishing floor covering;
prevents rotting of the underside of floor coverings, due to good ventilation between the material and the concrete screed;
a floor leveled with plywood prevents premature wear or deformation of linoleum or carpet, extending the life of the decorative coating;
provides a flat draft floor;
plywood sheets are light, hard, durable, resistant to loads and abrasion;
plywood is flexible enough and does not break during installation;
does not have a strong odor;
has good sound and heat insulation properties;
due to the large size of the sheets, the number of joints is minimal;
high-quality factory grinding prevents slipping of the sheet and the materials placed on it.

Why is it important to pay attention to the structure of the plywood itself

When making the final choice of insulation, it is also worth considering what kind of plywood is planned for it.

This component is divided into popular brands:

FSF - has an extremely high degree of moisture resistance, therefore, during installation, it requires the use of toxic types of glue.Non-residential premises (garages, warehouses, offices) are considered the best options for such coverage. As a basis, a reliable concrete screed is used, which is not afraid of high humidity;
FC is a material that contains in its composition special carbamide resins that are completely harmless to humans in terms of toxicity. For this type of plywood, a tree obtained by processing coniferous or deciduous plants can be used as the base of the floor covering.

With this in mind, floor insulation is selected for the specific environment in which it will serve. And a lot also depends on the type of plywood!

Mounting the lag on the surface

The timber is laid according to the markings on the fixed linings. Logs are mounted parallel to the wall with windows, i.e. across the direction of sunlight entering the room. The first log is installed at a distance of 30-40 mm from the wall, and all subsequent ones - 40-50 cm apart.

When specifying the distance between the lags, it must be remembered that the gap between the last beam and the back wall should also be no more than 40 mm. The distance between the lags should be the same. Logs should be fixed parallel to each other strictly at the same height (along the surface). All logs are selected with the same section size, except for the log located at the front door. It is advisable to install this timber from a wider bar (at least 50 mm).

With screws, the logs are attached to wooden linings, previously set up and fixed with anchors according to the markings. The heads of the screws should not protrude (preferably their recess in the log by 2-3 mm). The height of the lag must be strictly the same, therefore, during installation, the height is constantly monitored by beacons (if installed) or using a level. To increase the height, a roofing material of the required thickness is placed under the log.

The beacon allows you to determine the effort with which the screw is screwed in, so the height of the log is adjusted.
To strengthen the log, the installation of transverse bars (crossbars) is usually carried out. Such bars are fastened across the bar at the places of installation of wooden linings and fastened to them with screws.

For reliability, after installing the log, all wooden elements are coated with parquet or other similar glue. It is advisable to fill the volume between the lags with a heater and a sound insulator. For this, mineral wool, expanded clay or expanded polystyrene (polystyrene) is usually used. Before backfilling, all communications are carried out (if necessary). It is also recommended to apply a layer of parchment or bituminous paper over the lag.
Sometimes the installation of the timber is made without the use of wooden linings. In this case, the alignment of the lag is carried out by placing pieces of roofing material. The lag is fixed to the floor with anchors. The length of the anchor is chosen 5-6 cm more than the thickness of the bar.

Can plywood sheets be used on underfloor heating Benefits of plywood floors

Many residents of high-rise buildings and private houses experience discomfort from chilled floor coverings that are impossible to walk barefoot on. Therefore, it is quite logical to want to insulate the floors. Many people lay plywood on a warm floor, on which they subsequently lay a top coat (laminate, tile, etc.).

What types of plywood are used for heated floors?

Manufacturers produce a large number of varieties, varieties of plywood. Therefore, consumers are asking questions, is it possible to use it for laying underfloor heating, what types are used? Note that all types are suitable for use in installing a warm floor (on logs, on a wooden floor, concrete), but it is worth choosing the material individually, for each specific case.

There are five grades of material, and some of them are moisture resistant. To make plywood of the 1st grade, only birch, oak, beech veneer is used; knots cannot be found on it.Such materials are laid on the floor, but their cost is high, and the construction of the floors will be costly.

Second-rate material is more suitable for arranging a warm floor, while the quality does not suffer, and it will not hit the wallet either.

Advantages of plywood floors

With the help of plywood material, a good quality intermediate base is made for floor heating. When a piece parquet, a parquet board, fastened to the rough base with self-tapping screws, is placed on the adhesive mixture for a fine finish, then the addition of plywood sheets is mandatory.

Professionals advise putting such a "pie" of the floor even when laminate, linoleum is used as a decorative coating. With this position of materials, the role of heat and sound insulation falls on plywood.

The general advantages of plywood in arranging underfloor heating include:

Strength characteristics,
environmental friendliness of the material,
Acceptable cost in terms of purchase, work,
The range includes moisture-resistant types for use in rooms with high humidity,
The material is easy to process and maintain.

The use of plywood for heated floors is not as effective due to its poor heat conductivity. Therefore, underfloor heating under thermal insulation plywood will have to be used at full capacity so that heat seeps through the wood, and this will lead to increased heating costs. And in order to maximize the effect of the warm floor, it is recommended to choose the appropriate option for laying the structure.

Installation of floor heating on a plywood basis, unlike the traditional laying technique, is done without rigid fixation. Sheets of material are attached with this method of installation with metal mounting brackets. This makes it possible for the wood veneer to expand with an increase in humidity, and eliminates the appearance of swelling and cracks.

To install intermediate plywood flooring, several methods are used:

A material 1.2 cm thick is laid on a concrete screed,

Attention! Plywood sheets are attached to concrete using dowel-nails, adhesive mortar

On the base of wooden logs, thick sheets 2 cm thick are applied in 2 layers with spaced seams,
On old wooden floors apply material of any thickness.

Masters do not recommend installing a warm water floor under plywood, as this is ineffective, and there is a risk of damage, leakage of coolant pipes. And if this happens, then all the wet, damaged plywood will have to be thrown away. Therefore, for such floors it is better to choose a different finish.

When installing a warm electric floor using plywood, and then laying carpet, linoleum, it is worth considering some features. For installation, it is recommended to use underfloor heating film components from one manufacturer, which prevents problems with the use of the coating.

The assembly of a warm film floor resembles a "pie":

A heat reflector is laid on the main floor,
Then lay a layer of thermal film,
Lay down the plastic film
Then a hard coating is mounted, ensuring alignment,

Attention! It is not recommended to use sheets of chipboard, fiberboard, OSB - they do not give a flat surface, they can sag

Plywood sheets are fixed with self-tapping screws to the main coating, the joints are puttied,
After 2 days, lay the top coat.

A person who decides to make a floor heating system should remember that it is possible to use plywood on a warm floor system. You should only strictly monitor the base before laying - it must be perfectly dry, otherwise the plywood will absorb moisture, and the structure will become unusable.

Types of plywood used for work

The material varies depending on the type of wood veneer used in production. There are the following types of fabric:

What kind of plywood to lay on a wooden floor? There are different brands suitable for certain types of work.In industrial construction, plywood of the FB, FOV brands is used. For laying the floor in a residential area, the FSF, FK categories are suitable.

A canvas marked FC can be used to equip a wooden floor under a laminate in a nursery, bedroom. The material is impregnated with a phenol-free adhesive. The canvas does not pose a danger to human health. Such plywood sheets are quite strong, have an average level of water resistance.

What kind of glue to buy

How to glue tiles to plywood? This issue deserves detailed consideration, because you will have to glue the tiles to the base of wood material, which is distinguished by its instability.

Therefore, when choosing an adhesive composition, it is necessary to take into account some nuances:

A sheet of plywood is made up of thin layers of brittle veneer, and if the bond is broken, the plywood will delaminate and no longer be strong. This feature of the material is a good reason to choose an adhesive that does not penetrate deep into the structure of the material.
No matter how strong the base, it can still bend slightly under load. In this case, the cement-based adhesive will not hold the tile, and it will easily move away from the plywood. Therefore, only elastic adhesive mixtures should be used.

The composition of such mixtures includes highly elastic components:

microfiber;
fiberglass;
silicone;
silane and other modifying additives.

It is important! When purchasing glue, make sure that the list of listed materials for which it is intended to work includes plywood.