Insulation of the concrete floor is very important for creating comfort and warmth in the house, especially if the apartment is located on the ground floor.

But wooden floors sometimes also require insulation.

For example, in a private house, no matter how well the coating is done, it does not give a full guarantee of heat preservation, which means that it will not be possible to save on heating.

The systemic heat exchange of a house or apartment largely depends on the floors, since it is they that are the place of great heat loss.

Concrete is durable and has excellent performance, popular for flooring, but it has one serious drawback - the material is very cold. If it is located in a residential area, then high-quality thermal insulation is required, otherwise any heating will not be effective.

A cold floor means uncomfortable conditions in a room, a significant waste of energy resources for heating.

In addition, in the absence of insulation, and in the apartment of the first floor, located, as a rule, above an unheated basement, dampness may form, and as a result, mold on the walls.

All this can be avoided with a high-quality insulation structure.

The job of insulating the floor is not impossible. In the presence of necessary materials and any owner can handle it independently.

What kind of insulation is better to choose?

There are several types of insulation, produced in the form of blocks, bulk materials, rolls and even in liquid form. Each of them is quite suitable for insulating the cold floor of the first floor.

Mats and slabs

Heaters of this type have low thermal conductivity and low weight, they are the best fit for insulating the concrete floor of the first floor.

They can be used in conjunction with thin roll materials, which increases the overall thermal insulation.

Heaters in the form of mats and slabs are made of foam, mineral wool, basalt fiber, based on expanded polystyrene and other composite materials.

Since olden times, mats made of plant fibers, for example, straw, have been used to insulate floors in private houses, which is an excellent environmentally friendly insulation. The only negative is that organic matter undergoes decomposition over time.

Loose heaters

Bulk materials include sawdust, foam chips, slag and others.

They are used to insulate floors in ground floor apartments, as well as in private houses.

The advantage of bulk insulation is that they completely fill the space between the sheathing bars.

This material will fit how to post on open ground under the floor in a private house, and in apartments with an unheated basement below.

Roll materials

Foamed polystyrene, mineral wool, cork or cork-based composite mats, multilayer foil insulation, etc. are produced in the form of rolls.

Some of them are of small thickness, and therefore will not fully cope with the task of keeping heat - they are good to use in addition to thicker insulation.

Rolled mineral wool, 7-10 cm thick, is an excellent thermal insulator, so it is quite suitable for insulation.

Liquid heaters

Cement mortars mixed with foam crumbs, wood shavings, expanded clay and other light air materials are used as liquid insulation materials.

The modern version of liquid insulation is a polymer with a foamed structure - penoizol. To work with it, use special equipment, with which the material is used to fill the cavities between the lathing guides.

How to properly insulate a concrete floor?

When calculating the insulation of floors, it is necessary to take into account the significant load that all layers of the structure will be subjected to.

For different types floor insulation material is somewhat different from each other, but the general insulation system for all floors consists in laying materials in the following sequence:

1. The base is a concrete slab.
2. Waterproofing layer.
3. Wooden lathing.
4. Insulation laid between the lathing guides
5. (its sheets are overlapped by 15-25 cm and glued with special tape).
6. If the insulation has the thickness of the crate, a counter batten is nailed to it, which will create a gap between the insulation and the subfloor, allowing ventilation.
7. Sub-floor (thick plywood or board).
8. Additionally, a thin roll insulation can be used under the rough floor, which is spread over the sheathing.

It is easy to understand the technique of floor insulation by examining the given graphical diagram.

Features of insulation of the concrete floor of the first floor in a private house and apartment

Insulation of concrete floors in a private house and apartment differs in some nuances, but the principle of insulation is basically the same.

If the concrete floors of a private house are insulated, which does not have a basement under it, then you will have to resort to the use of several materials.

Naturally, it is better to calculate the thickness of the insulation in advance, when building a house, but if the insulation is carried out already in the finished room, it is necessary to prepare the base. The same is done in the apartment:

1. For this, it is removed decorative coating and a thorough revision of the concrete slab is carried out for cracks and chips.
2. The slab is cleaned, and all detected defects are eliminated using a concrete or ready-made repair mortar.
3. After it has solidified, it is advisable to treat the surface with a strengthening impregnation - sealing.
4. Next comes the waterproofing device - this process is important both for the floor of the first floor of an apartment and for a private house.

The waterproofing layer may consist of plastic film, which should be on the walls by 15-20 cm, or applied to the floors and lower parts of the walls with a special water-repellent deep penetration primer.

If in an apartment the crate (lags) can be laid immediately on the waterproofing, then in a private house it is better to raise it by 5-7 cm.

Raised floors above the concrete slab will allow for a thicker layer insulation material.

To do this, pieces of timber 5x5x15 cm are laid on the waterproofing, under which it is necessary to lay small pieces of roofing material.

1. Lags are laid on the bars and the entire structure is fixed to concrete base.
2. Further, in a layer of 12-15 cm, you can lay loose insulation, for example, expanded clay in dry form or with the addition of liquid cement mortar to it. In the latter case, after filling the space, it is necessary to wait for the layer to harden.
3. Plates are laid on top of it or roll option mineral wool, which has a low thermal conductivity, and is an ideal floor insulation for both a private house and an apartment. In addition to it, you can use foam or liquid insulation- penoizol.
4. The top layer of insulation should be approximately 5 mm below the lag level.
5. Mineral wool is covered on top with a vapor barrier film, which is attached to the logs with staples.
6. The last stage of warming is the construction of the subfloor, which may consist of boards or thick plywood - this will depend on which finish is chosen.

It is worth noting that if it is assumed, then the rough coating can consist of two layers: boards and plywood.

What is the best way to insulate the wooden floor of the first floor

Wooden floors in modern multi-storey buildings are no longer satisfied, but they are often found in old buildings and in the private sector.

The tree on its own warm material, but it has a peculiarity to dry out over time, as a result of which cracks form in the floors through which drafts penetrate into the apartment or house.

Such floors require insulation work:

• To do this, it is necessary to lift the existing old pavement. If it is in good condition, it can be reinstalled after the insulation process.
• After removing the boards, the logs are examined and, if necessary, replaced with new ones. Then they are treated with antiseptic antifungal agents and time is given to dry.
• Insulation is laid or poured onto the base of the floor.

  If the logs are high enough, you can arrange two layers of insulation, the lower one of which will be bulk, and the upper one made of foam or mineral wool slabs.

• The next step is to cover the insulation with a vapor barrier film, and a floorboard is laid on top.

When building a house, it is better to insulate wooden floors immediately, observing all technological rules. The diagram clearly shows the layers of the insulated wooden floor, going in the following sequence:

1. The foundation of the house.
2. Floor beams (logs).
3. Sub-floor beams.
4. Vapor barrier.
5. Rough floor.
6. Insulation.
7. On top of it is a waterproofing film.
8. Batten.

Basement side insulation

If the apartment is located above the basement, it is possible to insulate the floor from its side.

Insulation can be installed on the ceiling of the basement under the apartment.

Styrofoam, penoflex or mineral wool are suitable for this procedure.

• Styrofoam is glued to the basement ceiling using special glue. After it dries, all the gaps between the plates are sealed with polyurethane foam.

Mineral wool can also be used to insulate basement floors, but this will be more difficult and more expensive.

• Bars are fixed to the ceiling at a distance of the width of the mineral wool, minus 5 cm. This is necessary in order for the insulation mats to fit tightly between them.
• To keep the insulation securely, fiberboard or thin plywood is reinforced on top of it on the lag bars. Along the edge of the structure, along the walls, all the cracks formed are sealed with polyurethane foam.

In order for the insulation work to be effective, you need to know several nuances, on which the desired result will depend.

1. The first thing to do when starting to insulate the floor in an apartment on the ground floor is to examine the walls of the basement.

If cracks, chips, and possibly even holes are found on them, they must be sealed with cement-based solutions, polyurethane foam, or, if necessary, apply brickwork.

Basement ventilation holes on winter period can be covered, but they cannot be completely covered.

1. If insulation is done in a private house, under which there is a basement, you should additionally insulate the floor and outside, i.e. fix the insulation to the basement ceiling.
2. Need to know that high thermal insulation properties has a low density foam due to its porous air structure.
3. We must not forget about the installation of a vapor barrier, which must be installed correctly, and be sure to glue the joints with special tape.
4. Do not cover the fully ventilating subfloor openings, otherwise condensation may form under the floor covering or on the insulation itself.

In order not to make any mistakes, before getting down to work, you need to study its technology, calculate all the necessary parameters in accordance with the chosen method of thermal insulation and the type of insulation material.

If your apartment is located on the ground floor, there is no need to postpone floor insulation work. Sooner or later, cold and dampness will settle in the room, and with them, fungus and mold will appear on the walls of the premises, and it will be very difficult to get rid of them.

The floor is the coolest surface in the room. Even at relatively warm temperatures, the floor can remain cold. There is nothing strange about this. Let's remember the laws of physics: cool air always goes down, and warm air goes up. But that's not all. The cold penetrates into the floors of our apartments through interpanel joints, corner gaps, damp cellars... Up to 20-30% of the heat can escape from the room through a poorly insulated floor! At the same time, heating bills increase, but the rooms are still cold. In this case, it's time to start thinking about how to insulate the floors in the apartment. This will help reduce heat loss and create a more comfortable indoor climate.

Choosing an insulating material

The floor is insulated with materials with high thermal insulation properties, which prevent heat from escaping outside the room. For these purposes, the most popular are:

• Bulk materials(expanded clay, wood concrete, shavings) - have good thermal insulation qualities, are relatively inexpensive;
• Mineral wool and glass wool- effective in terms of heat and sound insulation, fireproof, not susceptible to infection by fungi and rodent attacks, hygroscopic (require mandatory vapor barrier);
• Styrofoam and expanded polystyrene- materials are moisture resistant, not subject to deformation, do not ignite, poorly conduct heat, drown out sound noises.

It is impossible to say which of these materials is the best. You need to choose based on your financial capabilities and functionality of the insulated room.

Thermal insulation of a wooden base

The traditional method of insulation is to lay the selected type of heat insulator in the space between the joists.

The scheme of insulation of a wooden floor by logs

To do this, perform the following steps. The first step is to remove the old floor covering, open the floor. Lay a layer of vapor barrier, for example, polyethylene or polypropylene film. Unfold the material and lay the strips on top timber frame the floor, laying them with an overlap of 15-20 cm. The joints are reliably insulated with special tape. When laying, they start vapor barrier film on the walls to a height of 3-5 cm.

Laying a vapor barrier film is necessary so that moisture does not penetrate into the insulation layer

Insulation is laid between the lags. When using expanded clay, it is evenly poured between the logs, leveling under one level with the rule. Sheet or roll insulation laid close to the lags, without cracks.

Formation of an insulating layer of mineral wool

On top of the insulation (if mineral wool or glass wool was used), another layer of vapor barrier is created.

The second layer of vapor barrier protects the insulation from steam penetrating into the ceiling from the room

Expanded polystyrene is an affordable insulation that does not absorb moisture and is quite easy to install. You can read more about the use of such material in our article:.

Lay on top of the insulated floor wooden planks, thick plywood, sheets of OSB or gypsum fiber board.

If necessary, mount the topcoat: laminate, parquet, linoleum, carpet, etc.

Insulation of a concrete floor

In most cases, the floors in the apartments of urban high-rise buildings are reinforced concrete slabs. The concrete floor itself is very cold, but if you add to this the gaps between the slabs, insufficiently tight joints between the walls and the floor, then it becomes truly icy. Therefore, insulation concrete surface is a top priority for residents multi-storey buildings who seek to improve the comfort in their apartments.

Each insulation craftsman deduces his own formula for an ideal insulating "pie" on concrete slabs. Let's consider the most popular of the possible options.

Option number 1 - insulation + screed

The thermal insulation properties of a concrete floor can be significantly improved by laying insulation between the floor slab and the cement leveling screed. In this case, the floor insulation in the apartment is performed as follows. The first step is to remove the old floor covering, remove the screed. The surface of the slab is cleaned of debris, dust, and irregularities from the remains of the cement screed are eliminated.

Warming the floor in the apartment using heat-insulating material and reinforced screed

Then vapor barrier is performed. A polyethylene or polypropylene film is laid on the concrete base, laying the strips with an overlap of 15-20 cm and leading 3-5 cm onto the walls. The overlap joints are insulated with special tape. Foam plastic is laid on the vapor barrier film minimum thickness 50 mm, density 25 mm. Instead of foam, you can use expanded polystyrene, mineral wool etc. Insulation sheets are laid as tightly as possible to each other so that cold bridges do not form in the seams. After that, another layer of vapor barrier is laid. If foam or expanded polystyrene was used as insulation, then this step can be skipped.

Now lay down metal mesh with square cells (cell side - 50-100 mm). The mesh will act as a frame for the cement screed, making it more durable. A cement screed with a minimum thickness of 50 mm is poured over the mesh. A thinner screed will be unreliable - after a while it will begin to crack and crumble. Cement strainer should dry, it will take about two weeks. Then, to strengthen the top layer, it is necessary to cover it with a primer. After all this, any decorative coating is laid on the screed.

Expanded clay is well suited for insulation of concrete floors. You will learn how to use such insulation correctly in the material:.

Option number 2 - insulation along the logs, without the use of wet processes

This option is similar to the insulation of a wooden floor. The difference is that in the thickness of the wooden floor, logs are initially provided, between which it is convenient to lay any type of insulation. In case of concrete floors you will have to design these lags yourself.

Insulation of the concrete floor along the logs excludes wet processes and does not make the overlap heavier

Concrete floor insulation technology on logs:

1. The first step is to cleanse concrete slab from old screed, debris and dust.

2. Arrange waterproofing. It is convenient to use ready-made waterproofing polymer-bitumen solutions, which are applied to the concrete surface with a roller or brush. Another option is to use a vapor barrier film for these purposes, which is laid overlapping on the floor, leading to the adjacent walls. If you want to save money, then the most acceptable material for waterproofing and vapor barrier will be ordinary plastic film.

3. Install the logs at a distance of no more than 0.9 m from each other, if you take a step more, the floors will bend. Instead of lag, if it is supposed to be used for insulation bulk material, metal beacons are attached to the floor.

Mounting wooden logs on a concrete floor

4. Lay the selected insulation. Both mineral wool and polystyrene are suitable, and any option of loose thermal insulation materials... Insulation in the form of sheets or rolls, unfolds tightly, without gaps between the lags. Loose material (for example, expanded clay) is poured between the beacons and leveled under one level with a metal rule.

5. Lay the floor. To do this, you can use sheets of plywood, gypsum fiber board, OSB, chipboard 10-15 mm thick. It is safer to lay them in two layers so that the seams of the lower sheets overlap with panels top sheets... Thus, the floor covering will be seamless, which eliminates the possibility of cold bridges. After laying, the layers of sheets are connected to each other and lags (beacons) using self-tapping screws.

Laying sheets of dense material (plywood, gypsum fiber board, etc.) on logs

6. Satisfy any finishing floor covering.

In a short video, you will be clearly shown the process of warming by lags:

Features of floor insulation by spraying

In addition to the above-described methods of insulation, there is another, professional, - spraying a thin layer of polyurethane foam (PPS) on the base of the floor. As a result, a monolithic, seamless surface with a thickness of 50-100 mm is formed on the floor. The technology of applying PPP involves the use of special equipment and some skills, so this work is only possible for specialists.

Equipment is used for spraying high pressure, which allows you to apply the material to the floor in the form of an aerosol liquid. Within seconds, this liquid spray layer transforms into rigid polyurethane foam. The efficiency of the obtained heat-insulating layer surpasses any other heaters - the thermal conductivity of PPS is lower than that of mineral wool, foam, expanded clay, foam concrete, etc. In addition, polyurethane foam is absolutely moisture-resistant, therefore it does not need additional hydro and vapor insulation. This material does not require floor preparation before application, it is not damaged by rodents, does not rot, does not burn. The service life of the heat-insulating layer of EPS is estimated by the manufacturers of this material at 30-50 years.

Polyurethane foam - effective method creating insulating and waterproofing coating in the apartment

Alternative methods of insulation

If the heat loss through the floor is small, then you can use more in simple ways insulation. Their essence is to use as flooring material with a low coefficient of thermal conductivity.

The simplest thing is to put carpet or carpet on the existing floor. Products made of natural wool with long pile have the greatest insulating properties.

Another option is to use thickened linoleum on a warm substrate (felt, jute) or on a foamed base. Likewise, you can "insulate" the laminate by placing a thickened substrate made of cork, polyethylene foam or expanded polystyrene under it.

Thus, in order for the floor to maintain a comfortable temperature even in winter, it is not necessary to use additional heating systems and "warm floor" structures. In most cases, to increase the temperature of the floor by several degrees, it is enough to correctly insulate it with the help of available materials.

We are used to thinking that floor insulation issues concern only private houses. Equally acute is the question of how to insulate the floor in an apartment on the 1st floor.

However, such work must be carried out in all premises if you want to save on utility bills.

Insulation materials

Features of work on insulation, depend on the chosen method and on the material used.

Take the vapor insulating film with a margin, since we will let its edges on the walls. And if you are going to use mineral wool, then remember that it must be covered on both sides.

There must be enough material for all the space between the lags.

How to insulate the floor in an apartment

We insulate the concrete floor

After two weeks, we proceed to the primer, and then we cover it with a decorative coating.

Thermal insulation on logs

This option is very similar to the insulation of wooden floors.

We need a timber, it must be quite even, dry and free of any defects.

Chipboard, plywood and polystyrene as insulation options

This option is not suitable for people whose apartments are located on 1 floors.

We insulate the floor in the apartment with expanded polystyrene

This is the most demanded insulation in the modern world.

It has good water resistance. And it will last as long as wood flooring, so you will have to replace it only at the next repair in 50 years.

Very compact, so the floor height will not change much when used. Can be laid on concrete, soil, even without preliminary isolation from moisture.

Warm floor enters our life at an incredible speed. Now, not only private, but also multi-storey buildings have underfloor heating elements. It can be either water or electric.

They are mounted in a screed or on top of it.

If you want a quality floor that will last a long time, contact a specialist.

Apartments located on the ground floor suffer from moisture and cold more than other apartments in the building. This is due to the direct contact of the floor covering with the floor slab, which separates the apartment from the unheated basement. As a result, the floor is always colder than the air in the apartment, and if in summer it is not so noticeable, then in winter such a cold floor will cool the entire room, moreover, provoking dampness.

Therefore for normal temperature floor covering, it is necessary to insulate the floors. This can be done by making repairs with your own hands or with the help of hired workers. The essence of floor insulation is to lay a layer or several layers of insulation on the floor between the basement and the apartment. In addition, a vapor barrier is needed, since condensation is inevitable due to the temperature difference, and moisture has a negative effect on insulating materials... Next we will consider different options insulation, insulation, we will tell you about materials, prices, and explain how to do all the work with your own hands.

Types of heaters

Expanded polystyrene

Expanded polystyrene, better known as polystyrene or its modified counterpart, penoplex, has excellent thermal insulation properties, is lightweight and easy to use. There is also extruded polystyrene foam. Its difference from the usual one is in water resistance. If ordinary polystyrene foam can absorb a certain amount of liquid and deform because of this during temperature changes, then its more technological form is almost completely waterproof. The only drawback of expanded polystyrene is its flammability.

Expanded clay

This bulk material is attractively priced and versatile. Can be used with dry floor screed or mixed with cement mortar... Also, with its help, you can arrange a floating screed with your own hands.

Polystyrene concrete

Unlike expanded clay, polystyrene concrete requires a much smaller layer to create acceptable insulating properties. Almost anything can be laid on it, including tiles. In addition, it has excellent sound insulation properties. You will learn more about this material from the video.

Mineral wool

Mineral wool and glass wool are among the most popular heaters, which is made in the form of tiles or rolls. The advantages include thermal insulation properties, reasonable price and vapor absorption. The disadvantages are the composition hazardous to health. When installing with your own hands, you should use respirators and avoid contact with exposed parts of the body. Therefore, mineral wool and glass wool need careful isolation to prevent dust from entering the premises.

Cork

Cork is perhaps the most expensive material on our list. It is environmentally friendly, durable and moisture resistant. It can be used even with fine finish, because in addition to its insulating properties, it looks beautiful as a topcoat. Among the shortcomings, one can note the instability to cuts and other mechanical damage.

Ecowool

It is made on the basis of cellulose, which means it is environmentally friendly and not hazardous to health. Possesses high heat and sound insulating properties, but does not tolerate moisture. Therefore, it is used in areas where there is no risk of contact with moisture. For more information on the advantages and disadvantages of ecowool, see the video

Penoizol

This is liquid polystyrene foam, all the advantages of which we talked about above. Advantageous difference liquid form such material, in the ability to penetrate the most inconvenient places.

Warm floor

The option of installing a warm floor is becoming more and more popular. Only its cost repels. There are several variations:

• Water;
• Electric;
• Infrared.

Water-heated floor, heats by means of communications with hot water under the subfloor. An electric underfloor heating is also installed and heats by converting electricity into heat. Infrared is the most modern, simplest option and can be installed with your own hands without the involvement of specialists. Subtle elements warm floors are placed under the finishing flooring. Only this type of floor can be done by hand, without special skills.

Basement side insulation

If the apartment is on the ground floor, then most likely there is basement... The obvious solution for floor insulation is to make repairs from the basement side, if there is no need to carry out repairs inside the apartment. In this case, a big plus will be that the floor in the apartment will not rise, and also, if the repair has already been done, then you will not have to open the floor and redo it again. When insulating from the basement side, there is no need for a neat fine finish, which makes it possible to do the work with your own hands, even for an inexperienced builder.

As a material for such repairs, ordinary expanded polystyrene or mineral wool is best suited, but its installation with your own hands is more laborious and the price is higher.

• At the first stage, you need to find floor plans, and make markings around the perimeter of your apartment. It is better to do it with a margin, so that the area of ​​insulation goes beyond the boundaries of the walls by a few centimeters.
• Then conduct a survey of the basement walls. Most likely, they will have cracks and chips, and maybe holes. They should be sealed with cement mortars or simple polyurethane foam.
• The first layer is glued to the vapor barrier, on construction glue or tape. Polyethylene is used as a material. The joints must be tightly sealed with tape.
• Then a frame is made of wood or aluminum profiles for attaching the insulation.
• Next, the insulation material is laid. If you use expanded polystyrene, then it is mounted in a frame and fixed with special dowels with a wide plastic cap as shown in the photo below.

If your choice fell on mineral wool, then logs from a bar are installed on the ceiling, in increments of 5 cm less than the width of the insulation, so that the wool comes in denser. The last step of the repair will be installation over the insulation on the logs of plywood sheets, for greater reliability.

Insulation in the apartment

Before doing repairs on floor insulation with your own hands, you need to calculate how high you can raise the floors. The higher, the thicker the insulation layers can be used.

• If the work will take place indoors after repair, then the first step is to dismantle the base.
• After all floor coverings have been removed, a thorough check is carried out carrier plate, for cracks, chips, and holes. If any are found, they are sealed with cement mortar, or a ready-made mortar for repair. After hardening, it is recommended to treat the surface with sealing, a special strengthening impregnation.
• The next step is waterproofing. This layer consists of polyethylene or a special water-repellent primer.
• A layer of roofing material is laid on top of the vapor barrier, a bar is laid on it, and logs are already laid on the bar. The entire structure is attached to a concrete base. Detailed description DIY lag devices on video

Hello!

My apartment is on the ground floor panel house... Luhansk, Ukraine. The goal is to make the apartment as warm and comfortable as possible.

Last winter we were on state heating - the apartment was constantly cold. A thermometer at eye level in the hallway showed 16-18 degrees. This winter we have been wintering since individual heating... It has become much more comfortable, but there is a but:

1. Cold floor. We have tiles in the bathroom and pantry. In the pantry, it is generally icy. The bathroom is a little warmer, but still very cold.
2. Other rooms also have a rather cold floor (the floors in the apartment are bad, although the house is 95).
3. The walls were also cold in the frost.
4. There is a slight draft on the floor.

A little about the state of the apartment now. Apartment plan and explanations about current state see the attachment.

From the side of the basement and the entryway (you can get there from the basement) you can see interpanel seams- they leave much to be desired. The floor in the hall and in the kitchen is bad (linoleum). We are going to change the floor in the whole apartment next spring.

Now the challenge is the best way insulate yourself. But there are a lot of questions.

1. Wall insulation. Wall thickness - 30 cm.

• What material to produce - regular or extruded foam. Basically, now I'm leaning towards the usual.
• How thick should you use? 70 or 50 is enough?
• Are there any easier options than mesh plaster? Because this is the most laborious and without practice, I plastered two basements under my balconies for a very long time. Preparing the surface, gluing the styrofoam, fixing it is a pleasure, but plastering is hell. Therefore, the question arose - are there any options for any coverage, or do I still have to contact specialists?
• Now the window tides are installed with a projection of 75 mm. As I understand it, this is not enough for any option? As I understand it, they should be 3 cm longer than the finished insulated wall?

1. Insulation of the wall from the side of the neighboring entrance.

• It is easy to get here, but it is rather difficult to climb to the level of the walls for work (narrow distance). I am considering the option of how to insulate this wall. In principle, it is possible to install a narrow long staircase and glue the foam, but without fixing it with dowels. The sun does not get here at all, moisture, in principle, is very little from rain, since the opening between the houses is not closed from above. For convenience, I'm going to glue on polyurethane foam, since by weight in narrow space it probably won't work otherwise. Those. my version: just glued regular foam
• Will this option work?
• Thickness 50, I think, is enough with a margin?

1. Floor insulation. I consider any options for floor insulation proposed by you. So far, I stopped at the following: foam plastic with glue on the ceiling in the basement.

• What kind of foam is better to glue here? Now the basement has iron pipes for heating and cold water, the highway runs under two bedrooms with a balcony. A locksmith is rarely visited in the basement - we call in to cook, therefore I am afraid. so that the foam from sparks does not catch fire during welding. Can this be?
• What kind of foam is better to glue in the basement?
• What is the ideal foam thickness?
• Since the slabs are concrete, as I understand it, there will be hollow spaces in them (I'm not sure about this), as a result, air can circulate in them. I was going to next year to do the floor like this: moisture insulation + cork insulation in rolls + warm floor + laminate. We are not going to turn on the warm floor all the time. Is this insulation enough or is more serious insulation needed from the side of the apartment?