Owners of apartments in old buildings, especially in the so-called “Khrushchev” and “Brezhnevka” buildings, are often faced with an inconvenient architectural element - a niche under the kitchen window. This winter refrigerator, conceived as a place to store food during the cold season, in modern realities has become a source of drafts and heat loss. The decision to dismantle it and align the wall with the rest of the kitchen is one of the most popular requests during a major renovation.
The process of eliminating a recess requires careful preparation and understanding of the structure of the walls, since improper sealing can lead to freezing of the corner and the appearance of mold. External brickwork, separating the room from the street, often has a thickness of only half a brick, which makes it vulnerable to frost without additional insulation. The correct approach to the issue will not only expand the usable area of the kitchen, but also significantly improve the microclimate in the room.
Before taking active steps, it is necessary to assess the condition of the existing structure and choose the optimal method of filling the niche. There are several proven methods, each of which has its own advantages depending on the budget and the desired result. It is critically important to completely block the access of cold air from the street, since even microscopic cracks in the insulation will lead to condensation. In this article we will analyze in detail all stages of work, the necessary tools and materials.
Design analysis and preparation to work
The first stage of any repair is a detailed study of the object. The winter refrigerator is a niche, the back wall of which is the external wall of the house. In most cases, there is a thin door or grille installed, behind which there is a vent opening to the street. It is through this channel that cold air enters the apartment. Before starting work, it is necessary to dismantle the doors, shelves and all protruding elements.
After clearing the niche, you should carefully inspect the condition of the brick or concrete. Often in older houses the masonry may be loose or have cracks. If you plan to completely seal a niche, you need to make sure that the load-bearing structures are not damaged. Dismantling It must be done carefully so as not to damage the main wall and window opening. Pay special attention to the area under the window sill, as cold bridges most often form there.
At the preparation stage, the issue with the ventilation duct is also resolved. Many apartment owners simply foam the hole, which is a serious mistake for houses with a gas water heater, where air flow is important. However, in the context of a refrigeration niche specifically, this channel usually leads directly to the street, and not to a common shaft. Therefore, its sealing is necessary for thermal insulation, but must be done hermetically.
- 🛠️ Check the strength of the brickwork of the rear wall of the niche for cracks and chips.
- 🌬️ Make sure that the ventilation hole does not lead into the common house shaft (relevant for gas boilers).
- 🧹 Clean the surface from old plaster, dust and oil stains for better adhesion of materials.
- 📏 Measure the exact dimensions of the recess to calculate the amount of building materials.
⚠️ Attention: If your apartment has an old type gas water heater with an open combustion chamber, make sure that the hole being sealed is is not part of the combustion air supply system. In 99% of cases, the refrigerator is not connected to the kitchen ventilation, but double-checking will not be superfluous.
The choice of materials for sealing and insulation
The quality of the result directly depends on the materials chosen. The main task is to create a multi-layer cake that will not only retain heat, but also vapor-proof the room from the cold external wall. The use of unsuitable materials can lead to the dew point shifting inside the wall, and moisture will begin to accumulate under the finishing.
Brickwork, foam blocks or aerated concrete are most often used to fill the niche volume. If the depth of the niche allows, you can use extruded polystyrene foam (EPS), which has excellent thermal insulation properties and minimal moisture permeability. Regular polystyrene foam is also applicable, but it is less durable and more fragile. Mineral wool is not recommended in this case due to its high hygroscopicity - it easily absorbs moisture and loses its properties.
Mounting foam is indispensable for sealing cracks and joints. Choose professional compositions with a low coefficient of expansion so as not to deform the structure. Vapor barrier film or foil penofol will be an excellent addition to the main insulation.
Comparative table of popular insulation for a niche under the window:
| Material | Thermal conductivity | Moisture resistance | Complexity installation |
|---|---|---|---|
| Brick | High (cold) | High | Medium |
| Foam block | Medium | Average | Low |
| EPS (Penoplex) | Low (warm) | High | Low |
| Mineral wool | Low | Low | Medium |
Step-by-step instructions: sealing a niche with bricks or blocks
The most reliable and durable way The solution to eliminating a winter refrigerator is to fill the niche with bricks or foam blocks. This method allows you to obtain a monolithic wall, which in its characteristics will not be inferior to the other external walls of the building. The process requires certain mason skills, but it can be done with your own hands.
Start work by preparing the base. Clean the bottom and side walls of the niche from debris, then generously treat the surface with a deep penetration primer. This will ensure reliable adhesion of the solution to the base. Prepare a cement-sand mortar in a ratio of 1:3 or use a ready-made adhesive mixture for masonry. Lay the first row of blocks or bricks especially carefully, checking the horizontal level.
During the laying process, do not forget about bandaging the seams so that the wall is strong. If you use foam blocks, they can be placed on a special glue, applying it with a comb. Each row should dry according to the mixture manufacturer's instructions. Do not rush to load the structure, let the solution gain strength. The upper part of the niche adjacent to the window sill must also be laid, leaving a small space for foaming.
☑️ Checklist for masonry
After the masonry is completed and dry, it is necessary to foam all the joints between the new section of the wall and the old window opening. The foam should fill all voids. After drying, excess foam is cut off with a sharp knife. Now the structure is ready for plastering. The surface of bricks or blocks also requires plaster to level and prepare for finishing.
⚠️ Attention: When working with cement mortars and adhesive mixtures, use protective gloves and goggles. Contact of alkaline components on the skin or eyes can cause a chemical burn.
Alternative method: insulation with sandwich panels and plasterboard
If there is no desire or opportunity to tinker with mortar and bricks, you can use an easier method. It consists of creating a frame and filling the space with insulation. This option is ideal if you plan to later cover the wall with plasterboard or plastic panels. In this case, the speed of work increases significantly.
First, a wooden or metal frame is mounted on the walls of the niche. The pitch of the racks depends on the width of the insulation sheets, usually 50 or 60 cm. The slabs are tightly installed into the cells of the frame expanded polystyrene or mineral wool (the latter must be covered with a vapor barrier on the side of the room). All joints between the insulation and the wall are thoroughly foamed.
A vapor barrier membrane is attached on top of the insulation if cotton wool was used. Then sheet material is installed - moisture-resistant plasterboard or sandwich panels. The joints of the sheets are puttied and reinforced with tape. This method allows you not only to remove the refrigerator, but also to perfectly align the wall in the same plane with the rest of the kitchen apron.
Nuance with the window sill
When sealing a niche, you often have to change or lengthen the window sill. If you fill a niche with bricks, the level of the window sill may shift. Calculate the height of the masonry in advance so that the window sill fits into place without gaps. You may need to order a new window sill of greater length or extend the existing one.
An important point is sealing the perimeter. Regardless of the method chosen, the perimeter of the former niche must be isolated from the rest of the wall. To do this, you can use a damper tape or a layer of foam along the contour before installing the finishing coating. This will prevent the transmission of vibrations and thermal expansion.
Finishing and restoration of the interior
After the niche is eliminated and the wall is leveled, the finishing stage begins. The important thing here is to choose materials that will harmonize with the rest of the kitchen. If the refrigerator was located in the kitchen apron area, then it is best to cover the restored area with ceramic tiles or porcelain tiles to match the rest of the coating.
For painting or wallpapering, the surface must be prepared: primed, puttied (if drywall or plaster was used) and primed again. A high-quality primer will reduce paint consumption and improve adhesion. When painting walls above a former niche, it is recommended to use washable paints that are resistant to wet cleaning, since external walls may be more susceptible to condensation.
Do not forget to restore the window slopes. After filling the niche, the side slopes may require repair or complete remodeling. Use plastic slopes with sandwich insulation or plaster them to prevent corners from freezing. Properly designed slopes will visually hide traces of intervention in the window structure.
- 🎨 Select the color of paint or tiles so that it matches the main interior as closely as possible.
- 🧱 Use moisture-resistant materials to finish the area adjacent to the street.
- 🔌 In Advance consider placing sockets or lamps in the place of the former refrigerator.
- 🚿 Treat the tile seams in this area with special fugues with antifungal additives.
Typical mistakes and how to avoid them
Even experienced craftsmen can make mistakes when working with external walls. One of the most common problems is insufficient insulation. Apartment owners often fill a niche with one layer of brick, forgetting that its thermal conductivity is high. As a result, the wall in this place remains cold, and in winter condensation appears on it, leading to black mold.
Another common mistake is ignoring the vapor barrier. Warm, humid air from the kitchen tends to escape through the walls. If on its way it encounters a cold surface inside the structure (for example, the inside of a brick), the moisture condenses. Therefore, the use of vapor barrier films or materials with low vapor permeability (such as EPS) on the inside is mandatory.
Also often forgotten about high-quality preparation of the base. Laying new materials on a dusty, greasy or damp surface will cause the plaster or tile to peel off after a short time. Adhesion is a key factor in the durability of the repair. Always take the time to clean and prime surfaces.
⚠️ Attention: Do not seal external walls in severe frost or rain if contact with the street is possible. When freezing, moisture inside the structure will expand and destroy the materials, and the low temperature will prevent the solutions from drying properly.
In conclusion, it is worth noting that eliminating the winter refrigerator is an investment in the comfort of your home. Properly done work will eliminate drafts, reduce heat loss and add usable space in the kitchen. Compliance with technology and the use of high-quality materials guarantee that the repair will last for many years.
Is it possible to leave the door from a winter refrigerator and simply insulate it?
Theoretically it is possible, but this is ineffective. Old doors have minimal thermal insulation. Even if you cover them with insulation, there will be gaps around the perimeter. It is better to completely seal the niche, and if you need access to communications (for example, there is a pipe running there), make an inspection hatch with a high-quality seal.
Is it necessary to obtain permission to seal a niche in a Khrushchev building?
Sealing a niche for a winter refrigerator is considered a cosmetic repair and does not affect the load-bearing structures of the house, so approval from the BTI or A housing inspection is usually not required. However, if you plan to punch new holes in the facade or change the configuration of the window, permits may be required.
What to do if, after sealing, the wall still freezes?
If freezing persists, it means that the thickness or type of insulation was chosen incorrectly, or cold bridges remain (for example, through metal reinforcement or poorly foamed seams). In this case, additional insulation of the wall will be required from the inside or, more effectively, from the outside (if there is access).
Is it possible to use a winter refrigerator as a cabinet?
Yes, many leave a niche, but they insulate the back wall well and change the door to a modern, airtight one. You can make shelves inside. However, it will not be possible to use it as a full-fledged refrigerator in the summer without connecting a compressor, since natural air draft for cooling will not be enough.