All about the insulation of houses from aerated concrete

Thermal insulation of aerated concrete premises is an important task to maintain comfort and ensure comfortable conditions. There are several material options on the market today that are suitable for this procedure.. We bring to your attention useful information about the features of the aerated concrete block and insulation options, as well as the principles of installation of one or another layer of thermal insulation.


In order for a house made of aerated concrete to be warm, it is necessary to carry out thermal insulation, in addition, this procedure is important to prevent the formation of condensation in the room.. It is extremely important to properly mount this layer, therefore, first you need to familiarize yourself with the types of material for insulation, and then choose the optimal one. The main features of construction work include the need to leave a gap between the insulation and the bearing walls of 3-5 cm so that moisture does not appear on the surface. The main advantages are not only a decrease in heat loss through aerated concrete, but also practicality, reliability and durability.

Lintels and thick seams must be covered with a layer of insulation, because they collect moisture, which leads to the formation of mold and the development of fungus.

The advantage of insulating houses from a gas block is economic feasibility, if you choose the right raw materials and carry out the installation taking into account all the requirements. It is impossible to do without thermal insulation materials in the northern regions, besides, this will not only improve heating and heat preservation, but also relieve the load on the foundation, since the thickness of the walls may not be so large. To perform the work, you can choose penoplex, mineral wool or polyurethane foam, each of the options presented has its own characteristics and characteristics. At the same time, it is important to observe the technology of insulation in order to get the expected result..

Experts recommend carrying out work in the warm season, so that excess moisture from aerated concrete evaporates, and one could proceed to the next stage.

When choosing insulation for the facade of the house, you must follow important rules. First, pay attention to the physical characteristics of the material – the cladding should not interfere with air circulation. Secondly, the vapor permeability of thermal insulation should be higher than that of aerated concrete. At the same time, insulation can be carried out not only from the outside, but also from the inside, however, it should be borne in mind that this reduces the area, you will also need to organize a ventilation system and protect against mold..

How and how to insulate?

First you need draw up a plan of preparatory and main work, where all conditions will be met. Experts recommend paying special attention to the seams: they should not be too thick. Even high-quality insulation will not give the desired result. The glue seam should not exceed 2 mm; it is better to use a cement-sand mortar with a layer of up to 12 mm to bond the blocks. There are some differences between external and internal insulation of aerated block houses. As thermal insulation, you can choose foam, expanded polystyrene, mineral wool or polyurethane foam. The latter option is suitable for siding, decorative stone or lining, you can also later use plaster and grout the joints.

If you choose the right insulation for outdoor work, the house will be protected from the influence of the environment, and you will not have to think about major repairs for a long time. Heating costs will be significantly reduced, in addition, sound insulation will improve, and this provides a comfortable living environment.

It should be noted that external insulation makes the facade of the building attractive.

Mineral wool

This material is in high demand and can be found in slabs or rolls. The main characteristics that attract the consumer include high vapor permeability, strength, resistance to chemicals, as well as rodents, insects or fungi and fire safety. One of the benefits is environmental friendliness surfaces: mineral wool does not cause allergies, therefore it is not dangerous to humans. Many people choose basalt slabs for insulation, but since the composition contains fiberglass, this option is not suitable for everyone..

To carry out work on the insulation of the house, you first need to prepare the facade by cleaning the walls and leveling the surface with cement mortar. Then, priming and coating with vapor-permeable plaster are carried out. It will be necessary to build a frame, fix the structure according to the shape and size of the mineral wool (it depends on whether a plate or a roll is used), it is important to provide a ventilation gap so that air circulation occurs and steam does not accumulate. The insulation is fixed with special glue and plastic dowels for additional effect. Then the layer is reinforced with a mesh for further cladding..

As a finish, you can use a primer or putty and then coat with acrylic paint that is moisture resistant.

Expanded polystyrene

If you do the insulation of the house yourself, you can safely choose polystyrene or penoplex, these materials managed to prove their effectiveness and a number of positive characteristics. It should be noted that these products easy to install, it is lightweight and therefore does not give additional load on the foundation. Expanded polystyrene is suitable for thermal insulation of facades of premises: both residential and commercial.

An additional bonus is the affordable cost, because this material is cheaper than mineral wool. It should be remembered that the foam is not vapor permeable, and this is a disadvantage. If you decide to sheathe aerated concrete with this material, you will need to make a wooden structure, leave room for ventilation, and only then install foam insulation. Here, too, for a start, it is important to level the surface, clean it and prime it. The frame system is attached using special guides, and the next step is to install expanded polystyrene.

For fixing, you can use either foam or glue. If you are installing Styrofoam sheets, you can use plastic dowels. At the final stage, decorative finishing is performed – priming, fiberglass mesh, a layer of reinforcing glue and plaster.

Separately, an armored belt for aerated concrete should be highlighted, which is a strip structure made of monolithic concrete. The main task of the material is to repeat all the contours of the building.. This is an important element in aerated block houses, as it improves resistance to loads from various factors and negative influences. Armopoyas can be done in the middle of the masonry or under the roof. If this is a multi-storey building, then in the partitions between the floors.

We must not forget that it is necessary to insulate not only the walls, but also the floor in the house from aerated concrete. Today, many options are offered for this, the most practical and effective design can be called “water underfloor heating”, which will evenly heat the room. The heated air will rise and fill the rooms, and the insulation on the walls will keep it inside. The floors can be electric or hydraulic, the latter are made of flexible pipes that are installed over the area of ​​the room and connected to the heating system, after which a concrete screed is made. For thermal insulation of the floor, it is better to choose foam plates 5 cm.

Useful Tips

If you decide to do the insulation of the house outside and inside on your own, you must follow certain recommendations in order to do everything right. First of all, it is important to make a heat engineering calculation of external walls, for this there is an online calculator. For masonry, a gas block with a thickness of 300 and 400 mm can be used. If we talk about a temperate climate, the best option would be to install one block 30 cm thick. Insulation is indispensable here. The easiest way is to increase the thickness of the main wall, but this is only suitable in cases where the width of the foundation is sufficient. If there are certain restrictions, it is recommended to use low density aerated concrete, which will extend the life of the insulation.

Experts advise to choose the type of insulation, based on the features of the location of the house, the number of storeys of the apartment. Not everyone knows that insulation is paint, plate, roll and bulk, depending on the material. The most effective option is outdoor work, since you do not need to be limited in the thickness of the building materials used. If you are afraid of shrinkage, you can safely opt for foam, which has low moisture absorption and low weight. It should be remembered that the material crumbles during processing, so you have to work with it carefully.

Pay attention to the plates, whose density is B24, and the thickness is at least 100 mm, or use a two-layer fastening. When fixing, the slabs should overlap the gaps between the bottom joints and the top gaps should be sealed to minimize blow-through. Styrofoam can be attached to glue or cement-sand mortar, but you cannot do without plastic dowels.

If the building is old, before starting to insulate, you need to take care of sanding, since plaster can negatively affect adhesion.. It is important to prepare the surface for subsequent work and choose a high-quality material for thermal insulation that is reliable and durable..

If you opted for mineral wool, stone wool has low moisture absorption. It has an intricate structure that provides low thermal conductivity, moreover, it is safe to use and does not burn, which is important. Polyurethane foam has recently become more and more popular due to its low weight and long service life..

Aerated concrete blocks have a small bearing capacity, so the inside will not be too spacious if the area is limited. Therefore, if you are engaged in insulation from the inside, then it is necessary to select a material that has a small thickness, but excellent efficiency.. It is impossible not to highlight the insulating paint, which is fireproof and resembles mineral wool insulation in its properties, since a 1 mm layer gives the same insulation as 50 mm mineral wool, which is impressive. In the composition of such paint there are glass, and sometimes ceramic microspheres, which are filled with vacuum, which means that infrared waves remain inside the room, as a result of which heat is retained.

Preparatory work plays an important role, since aerated concrete blocks can have defects in the form of chips and cracks. Therefore, first you need to seal them with glue or plaster. Pay special attention to the slopes of the windows, as cold can penetrate faster through microcracks. Mineral wool for outdoor use is suitable not only for plastering, but also for siding, which is an advantage. For the latter, a crate should be made of guides, which is installed on the facade of the building, after which a layer of vapor barrier is laid, and only then slabs and a second layer of vapor barrier.

Warming of the armopoyas can be carried out not only during the construction of a house, but even after it (after some time). But the procedure is carried out exclusively outside the premises. For work, it is recommended to use 80 mm thick foam boards. The height is calculated according to the following principle: the thermal insulation is attached 15 cm above and below the reinforced belt. To extend the service life, it is important to place an ebb tide with a drip, which will divert melt and rainwater, it must be placed with a slight slope from the wall.

Penoplex insulation is in demand for a number of reasons.. Its main characteristic is its thermal insulation properties, which this material has much better than analogues.. In addition, the products are offered at an affordable price, so you don’t have to spend huge sums on building insulation. This is a profitable option for thermal insulation, the indisputable advantage of the material is hydrophobicity. A study in which the penoplex was immersed in water for a month showed that the product had a low moisture absorption rate. The structure of the material resembles closed cells that can only absorb water if damaged.

Now you are familiar with different types of insulation that are used to insulate houses from aerated concrete blocks. Each of them has its own characteristics and advantages, so you should choose based on personal requirements and the characteristics of the area in which construction work is being carried out. Thermal insulation plays an important role in providing a comfortable environment and conserving resources. You can study in more detail the characteristics of mineral wool, expanded polystyrene or polystyrene foam, analyze their performance in order to choose the best material. You can do the work yourself, without outside help – you just need to follow the recommendations and do everything consistently.

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