If your apartment or house is cold and damp in winter, or you have to pay enormous sums for heating, then it becomes clear that there is an apparent reason why the heat is not retained in the room. The most straightforward and most logical idea at first glance is wall insulation. Most often, in the minds of the average person, insulating walls with your own hands is associated with the interior decoration of a room. However, such conclusions, in most cases, are irrational and even hasty. The main problem with internal wall insulation is that it does not become warmer and, in some cases, even begins to freeze more!
Internal insulation of walls in many aspects leads to disastrous results, against the background of which the gain in retained heat is minimal or completely disappears. The most effective way to protect yourself from heat loss and create a suitable indoor climate is to use external insulation on the walls of an apartment or house.

In what cases is it permissible to insulate walls from the inside? Only in a few instances, when there is no other choice, can you take a risk and protect the walls from the inside: the authorities ban changing the facade of the building (the cultural value of the building, the front side of the building facing the central streets, etc.) there is an expansion joint behind the wall between buildings; behind the wall, there is an elevator shaft or other unheated room in which it is not possible to install insulation.

In addition, insulation from the inside can be effective and acceptable only if included in the construction project, such as in the modern construction of frame houses. In this case, if the insulation is insufficient, you can strengthen the existing one with the necessary layer of the same insulator used during construction. The same can be said for wooden walls. All wood is used if you need to insulate them from the inside.
Other reasons to insulate the walls of a house from the inside cannot be reasoned. It is best to protect from the outside, even if this means changing or transferring the exterior design to a new exterior covering.
If, for objective reasons, it is decided to carry out insulation indoors, then you should take this process as responsibly and carefully as possible, starting from the choice of insulation materials and ending with installation.

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Features of insulation from the inside

The main problem with internal wall insulation is that it does not become warmer and even begins to freeze more. This causes the dew point, where moisture from the warm air in the room starts to condense, to be transferred even closer to the inner edge of the wall or its surface. In this case, condensation will inevitably lead to dampness and destruction of the wall itself and the finishing layer, deterioration of the thermal insulation properties of the insulation material and, as a result, heat loss will again be high and even greater humidity. Brick walls will suffer the most damage from dampness.

To avoid this, it is necessary to choose insulation with minimal vapour permeability, moisture absorption and the absence of seams or joints during installation through which condensation could escape into the room and air into the space between the wall and the insulator. Materials such as mineral wool, liquid ceramics, cork, plasterboard, and warm plaster do not meet these criteria. The last two options can only be used as the final insulation stage. Fibre, moisture-absorbing, or vapour-permeable materials are not suitable for insulating walls from the inside. Expanded polystyrene (people) is also very questionable since it is difficult to achieve a reliable connection with the wall without solutions, and the joints between the sheets will play an essential role in deteriorating the tightness.

Moments that must be endured before starting insulation from the inside!
Thus, a picture of the requirements for the process of insulating apartment walls emerges:

• the wall is as dry as possible;
• installation of waterproofing and vapour barrier separating the wall from the interior space of the room;
• the insulator must have maximum moisture resistance and minimum vapour permeability;
• the heat insulation layer should not have joints, cracks or gaps.