Corner apartment: the first question how to insulate the walls?

There are certain benefits to living in a corner apartment, such as more natural light and views from various directions. It does, however, also come with difficulties, especially in terms of insulation. Corner apartments are more likely to lose heat in the winter and gain heat in the summer because they have two external walls as opposed to one. Because of this, having enough insulation is crucial to keeping your home cozy and lowering your energy costs.

There are a few things to take into account when figuring out how to insulate the walls of a corner apartment. The type of building, the materials utilized, and the environment all affect how much insulation is needed. It’s also important to evaluate any existing insulation to see if any upgrades or replacements are required. In addition to controlling temperature, proper insulation reduces noise, enhancing privacy and general comfort.

Adding insulation to the interior is one of the most popular ways to insulate the walls of corner apartments. Installing blown-in insulation or insulation batts between the wall studs will accomplish this. Alternatively, the interior wall surface can have rigid foam insulation boards directly attached to it before being finished with drywall or other materials. These techniques can drastically lower heat transfer and offer effective thermal resistance.

By addressing the external surface, corner apartment walls can also be insulated in another way. The outside walls can be equipped with external insulation systems, such as foam boards coated in a protective layer or insulated cladding. By using this technique, an ongoing thermal barrier is created that keeps heat from leaving the apartment and cold air from entering. Long-term advantages in terms of energy efficiency and building longevity may be possible, even though it might necessitate more involved building work.

It is important to take into account the effect on the apartment’s space and appearance, regardless of the insulation method that is selected. While exterior systems can change the building’s appearance, interior insulation solutions may cause the dimensions of the rooms to slightly decrease. Achieving the best results in a corner apartment requires striking a balance between practicality and aesthetic appeal and the effectiveness of insulation.

Materials Benefits
Insulation foam boards Provide good thermal insulation, easy to install
Mineral wool Offers excellent soundproofing and fire resistance

Features of corner premises and indications for insulation

Because the corner location’s premises have two or three external walls, they are more exposed to outside temperature fluctuations, creating a challenging microclimate. As per the guidelines, this category’s area was initially furnished with twice as many heating radiators. Unfortunately, nothing can be done about it, not even the additional use of powerful electric heaters; as autumn colds set in, the apartment’s humidity level increased.

Excellent wall surface thermal insulation is the only reliable method of ensuring a cozy microclimate in corner rooms. There are terrible outcomes if the surrounding structures are not heated in a timely manner:

  • the formation of condensate, since the dew point is located on the inner surface of the wall structure;
  • Increased air humidity contributes to the development of pathogenic microorganisms on the internal surfaces of the walls;
  • dampness provokes the destruction of the structure of the base materials;
  • The finishing coating quickly loses its quality characteristics, the wallpaper leaves the walls, the plaster does not hold, spots appear;
  • An unpleasant odor emanating from the damp walls is installed in the dwelling.

Mold-filled, musty air can aggravate long-term respiratory illnesses, trigger allergic reactions, and cause significant disruptions for the household. Moreover, wintertime in corner apartments is just as cold as the off-season.

The walls of corner apartments with high-quality insulation help shield against potential health issues and let you create the ideal microclimate in the summer and winter.

Thermal insulation methods of the corner apartment

In a multi-story building, there are two choices for thermal insulation of the enclosing structures.

Wall insulation outside

The technology makes it possible to install insulating material away from the building’s facade. Because of its effectiveness, the walls’ external thermal protection is regarded as a top priority. However, the following details should be considered:

  • External work in some cases is impossible. For example, legislation prohibits the facade changes if a multi-storey building is located in the city center or is one of the historical and architectural monuments. Or it is difficult to access the object due to the close location of neighboring buildings;
  • To insulate the walls of the corner apartment, it is necessary to help specialized companies in industrial mountaineering, the services of which are expensive.

One major benefit of thermal insulation for facades is that it keeps walls safe from cyclic frosts and extends the life of interpanel sutures.

Wall insulation from the inside

Without the assistance of experts, internal thermal insulation of enclosing structures is frequently done by hand. This is a reasonably cheap method of shielding the corner room’s walls from the effects of dampness and cold. Nevertheless, a number of issues make the decision unwelcome:

  • insulation of the walls of the corner apartment from the inside as a method of protection against cold is considered less effective than external thermal insulation;
  • A certain amount of useful space of the room is “eaten” when laying the insulation and facing material. In addition, there is work to arrange 2 or 3 walls in one room;
  • It is necessary to redo out sockets, switches, install remote structures;
  • Moisten batteries should be dismantled and installed after thermal insulation work.

This is frequently the only way to enhance the microclimate in the room with two external walls, despite its many drawbacks.

Types of materials for insulation

There are several excellent and efficient solutions available in the form of thermal insulation materials.


Release a number of mineral wool varieties:

  • glass wool – the material is relevant for insulation of technical space, basement and attic premises, the composition is able to secrete toxic substances;
  • slag – also due to the toxicity of the composition is not used in the arrangement of living spaces;
  • Stone cotton wool – made from rock waste, is characterized by high performance characteristics and environmental impeccability. For thermal protection of internal surfaces, basalt cotton wool is most often used.

Because basalt cotton wool is hygroscopic like all other types of mineral wool, it is used in conjunction with a hydro-yapal-ore membrane.

Using foam

The polymer base makes up the remaining 98% of the air bubbles, which are made up of foam. The material is released by having a very low coefficient of thermal conductivity, is simple to install, and works well both inside and outside. Nevertheless, foam foam releases harmful substances during combustion even though its composition includes modifying inclusions. The insulation is typically finished with drywall or plaster.

Extruded polystyrene foam

The qualities of this kind of foam are better for thermal insulation. Moisture and steam are not absorbed by extruded polystyrene foam. In order to prevent condensation from forming on the interior surfaces, the material aids in moving the dew point to the outer plane of the enclosing structure or in the thickness. Extruded polystyrene foam, similar to polystyrene, must be used to insulate the walls of the corner apartment. This requires base preparation and the removal of flaws and irregularities.

The use of porcelain

Porosol, a liquid finishing composition, is used to protect enclosing structures from heat both internally and externally. Products are distinguished by their high levels of thermal insulation, resistance to atmospheric influences, and inertia to biological threats. Applying six layers of porcelain in alternating horizontal and vertical directions can guarantee the highest possible degree of heat conservation in corner rooms.


A modified liquid foam with excellent adhesion properties is called foam insulation. Penoizol is useful for sealing joints and filling spaces because it can create a single, seamless layer of heat insulation that prevents cold bridges. Just prior to application, the foam-air composition is made in a dedicated installation and spilled under pressure. The high degree of thermal barrier tightness and the material’s relative availability when compared to alternative sprayed insulation types are two of the penoizole’s benefits.

Using Astratek

When thermally insulating corner room walls from the inside, Astratek uses creative solutions to reduce the cost of usable space. Applying liquid material containing polymer inclusions can be done with a paintbrush or a spray gun. Excellent insulating qualities set Astratek apart; as a thermal barrier, a layer of 1 cm thick is equivalent to 50 cm of mineral wool. The material can be applied and still form a homogenous coating that requires little processing before the final finish is installed. Astratek is marketed on the market with universal uses and facade solutions.

The nuances of insulation of the corner apartment

The main materials used to insulate the walls of a corner apartment are mineral wool or foam slabs. Because of the polymer composition’s vapor permeability, foams are not a good choice for insulating wooden houses from the inside since they cause a lot of condensate to form. Within a panel house, priorities for work include basalt, cotton, and wool. Foam plates provide excellent thermal protection for both brick and concrete structures.

In a panel house

Using a mineral wool for thermal protection of a panel house requires the use of a waterproofing layer, such as polyethylene film or a specific membrane material. Using an entire canvas to cover the entire wall is advised. Next, construct a metal guide frame that fits between the profiles and holds the insulation mats in place.

In a brick house

The most common type of thermal insulation in brick-built buildings is foam. Following a thorough cleaning, two coats of primer are applied to the walls to improve adhesion. Utilizing construction glue, secure the slabs.

Technology of insulation

The corner apartment’s enclosing structures are thermally insulated both internally and externally while considering technological features.

We warm the walls from the inside

The steps to be taken in a panel house when warming the corner room’s walls from the inside are as follows:

  • preparatory work. It is necessary to clean the surface of the old finish, eliminate defects in the base using construction solutions;
  • waterproofing. Apply special membrane material or polyethylene film. The joints of the waterproofing canvas are glued with tape to create a monolithic coating;
  • Chatter. Actual both wooden guides and metal. In this case, the tree is treated with antiseptics and antipyrens. The interval between the elements of the crate is selected in accordance with the dimensions of the insulation;
  • Installation of the heat insulator. The slabs are laid in the openings of the crate. The gaps are sealed with construction foam;
  • vapor barrier. The membrane is laid with a sealed layer, the joints are glued with tape.

The finishing line of the wall is then established by mounting drywall.

External insulation of the corner apartment

The following phases are made possible by the panel structure’s external enclosing structures’ thermal protection:

  • the surface is freed from foreign elements in the form of external blocks of climatic equipment, satellite antennas, advertising shields and other items;
  • clean the base, close chips, cracks and potholes;
  • build a crate using metal profiles;
  • perform two layers of waterproofing with a layer of vapor barrier between them;
  • mount insulation slabs between the guides of the steel frame.

Finishing work should come next.

In a brick home, the exterior walls are insulated using the following technology:

  • Before starting the installation of sheets of foam, the brick base is cleaned of the old finishing coating;
  • It is necessary to align the surface to ensure the dense fit of the panels of the polymer insulation. For this, the base is thoroughly placed and treated with primer;
  • Glue is applied to the back of the plate with a continuous strip around the perimeter and portioned throughout the area, applied to the base and tightly pressed. The seams are treated with a sealant to create a monolithic heat and hydraulic tank.

Following the heat-protective coating’s drying, a second layer of primer is applied to the surface to further protect it before adding decorative elements.

It’s essential to insulate the walls of a corner apartment to keep the interior cozy and lower energy expenses. Compared to inner apartments, corner units are more vulnerable to heat loss and drafts because they have two external walls that are open to the weather. Thankfully, there are a number of efficient insulation solutions available to deal with this problem.

Installing insulation directly onto interior walls is one common option. With this technique, an additional layer of insulation—such as foam boards or fiberglass—is placed between the external wall and the drywall. By acting as a barrier to heat transfer, it keeps the interior space more comfortable throughout the summer and less warm during the winter. Furthermore, insulating interior walls can lessen the amount of noise that is transmitted from nearby apartments.

Insulating the building’s exterior walls is an additional strategy. Usually, this technique entails covering the exterior wall surfaces with spray foam insulation or insulation panels. External insulation can offer better thermal performance and may be more successful in avoiding cold spots and condensation within the apartment, even though it might need more involved work and coordination with building management.

It’s critical to take into account a number of factors when choosing the ideal insulation solution for a corner apartment, including the amount of disruption to tenants during installation, building codes, and budget. Determining the best choice based on specific circumstances can be aided by speaking with a licensed builder or contractor.

To sum up, adding insulation to the walls of a corner apartment is a doable way to increase comfort, energy efficiency, and overall livability. Investing in appropriate insulation can reduce heating and cooling expenses over time and improve occupant quality of life, regardless of whether exterior or interior insulation is chosen.

When it comes to insulating the walls of a corner apartment, the first thing to consider is how to effectively retain heat and reduce energy costs. Since corner units are more exposed to outdoor temperatures, proper insulation is crucial for maintaining a comfortable indoor environment. Start by assessing the current insulation situation and identifying any areas of improvement. Utilizing insulation materials such as foam boards, fiberglass, or spray foam can help create a barrier against heat loss. Additionally, sealing any gaps or cracks in the walls can prevent drafts and further enhance insulation. Prioritizing insulation in corner apartments not only enhances comfort but also contributes to energy efficiency and cost savings in the long run.

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Michael Kuznetsov

I love to create beauty and comfort with my own hands. In my articles I share tips on warming the house and repairing with my own hands.

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