The main difficulties of multilayer brick masonry

There are several ways to build a house out of brick. One option is multilayer masonry. This makes it possible to place the insulation between the bearing and front walls. So it will be reliably protected from damage, in addition there are more opportunities for the construction of a beautiful facade.

Pros and cons of multilayer masonry

But there is a danger, as condensation may form between the layers, which will lead to wetting of the insulation. The parameters of multilayer masonry should be calculated at the design stage.

Laying in several layers has its pros and cons. The benefits include:

• Beautiful and representative appearance, subject to expensive finishes;
• Long service life if the design and installation are performed correctly.

And the disadvantages are:

• The complexity of the construction, since you need to be able to make the right dressing between layers;
• Poor air ventilation;
• Accumulation of condensation between layers of different materials.

An important quality is the compatibility of the layers in terms of vapor permeability. If this property is not taken into account, then the moisture accumulated inside will cause the appearance of mold and fungus. Wet insulation will lose its protective properties, and the house will freeze and collapse.

Therefore, multilayer masonry is best done with an air gap. This allows you to remove excess moisture immediately into the environment. The complexity of this solution is that the wall thickness increases, which means that the foundation will have to be made more powerful due to the high load.

The method of three-layer masonry

In three-layer masonry, the material for the supporting wall is red solid brick. The wall is laid on cement in 1.5-2 bricks. The front wall is built of half-thickness facing bricks.

If the system is made with an air gap of 2 to 5 cm, then ventilation should be left vents at the bottom and top of the wall: at the base and at the eaves. The lower ones will also serve to drain water. Through the upper moisture in the form of steam will be able to freely leave the space between the walls. For every 20 square meters. m wall is made a hole of 75 square meters. cm.

For ventilation of the insulation at the bottom of the wall, slit brick is used, which is placed on the edge or at a small distance from each other. The gap is not filled with a solution.

Layer links

Another complexity of multilayer masonry - between the internal and external walls, the laying of connecting parts is necessary. They are made of fiberglass, basalt plastic or reinforcement with a thickness of 4.5-6 mm. With steel reinforcement, heat loss will be greater, so it is undesirable to use it. The best option would be glass or basalt.

Binding elements are installed in the wall during the laying process to a certain depth and with a given step. It turns out four pins per square meter of surface. Then the insulation can simply be put on them, fixing it with washers. A uniform gap remains over the entire area of ​​the wall.

In addition, reinforcing bars with bent ends or steel reinforcing mesh can be used for ties. To leave an air gap, the plates will have to be additionally mechanically fixed.