Facing the house of aerated concrete

Recently, the construction of the house of aerated concrete blocks is becoming increasingly popular. There are many ways of facing aerated concrete houses.

Plaster walls of aerated concrete

The most popular method of coating aerated concrete walls, which will eventually become moisture-proof and insulated, is the exterior finish of the house of aerated concrete plaster. On aerated concrete blocks, it is carried out in the same way as when plastering walls built of brick. The solutions are based on high-grade cement with water-resistant characteristics. When finishing the facade do two layers of plaster, while the second should be "warm", therefore, when preparing it, slag sand is used. The pores in it are small, in connection with this finishing layer is also called primer.

• Before the start of plastering work, carry out the preparatory work. Their essence lies in the deepening of the interblock seams. To do this, you need to choose a suitable tool and bring the depth of the seams to 5 mm, then remove dust from the treated surface.
• Cement mixture adheres well with blocks of aerated concrete, so the solution can be applied directly to the surface of the walls. But here it must be borne in mind that the blocks are larger than bricks, so the seams that play a reinforcing role are at a considerable distance from each other. Hence, a kind of reinforcing mesh has a big step, which is not conducive to good adhesion of the plaster mortar with aerated concrete walls.
• To remedy the situation, you can directly on the blocks serifs of a certain depth. To do this, you can use a chainsaw or grinder. Since aerated concrete is easy to process, you can use other tools.
• You can do it in a different way and fix a metal reinforcing mesh on the wall. It should be galvanized and with a small pitch between cells. The grid should be fixed with nails 0.12 m long, which should be driven into blocks close to each other. So that after plastering the surface from the mesh, the ends of the wires do not stick out, they should be cut off or bite off before finishing with a suitable tool, for example, with pliers.
• Fixing the grid on the wall of the gas blocks, the cement composition is sprayed, which fills the voids in the metal sheet. The first layer is not processed, but left in its original form. After waiting for some time to grab the first layer, make the second primer layer, which includes slag sand. This layer needs to be smoothed, while its thickness should not exceed 5 mm.
• After the primer dries, it is the turn of the finish. Fine-grained sand is applied to the surface of the walls in the end was particularly smooth. The plaster of the finishing coating is carefully smoothed. Pigmented plaster mixtures can also be used for final finishing.

In this video you will learn more about the technology of plaster of aerated concrete with preliminary insulation:

Facing brick facade

In no way inferior to the previous method of facing a house of aerated concrete with brick. This job takes time, certain skills and calculation. With proper implementation of this type of finish this method is quite effective.

• This type of work should be planned at the stage of building the foundation, the blocks of which should be half a meter from the future surface of aerated concrete walls. The foundation must simultaneously carry both a gas-concrete wall and brick cladding. The main walls are drawn along the inner contour of the foundation, and a facing brick is laid on the remaining foundation.
• The facade is made one brick thick. The laying is carried out in the usual way using beacons and checking the verticality of the walls with a plumb. In order not to use plastering as a result, a facing or silicate brick is used.
• Brick can be put as close to the concrete walls, and with the formation of a gap between the two surfaces. If such gaps are not provided, then the inner surface of the brick cladding should not be bound by the cement mixture to the main wall. Since brick and aerated concrete react differently to temperature, the associated structure will be deformed.
• There are two methods to connect the facing material with the main wall. The first of them provides for the installation of reinforcement screeds in the aerated concrete wall, which should perpendicularly exit the aerated concrete wall to a distance of about 10 cm. When laying bricks, these metal rods go into the seams of the facing material.
• The second method is similar to the first in principle, but differs in technology. Metal pins are hammered into the main wall, the outer ends of which end in washers. Along the stretching of the facing wall, the pins are hammered into the aerated concrete blocks, after which the recesses are cut into bricks for a certain distance. The top row of cladding pins cover and form a secure connection. In both cases, the connecting elements should be located with a certain frequency - every 5 rows of bricks and at a distance of up to 1 m horizontally between each other.

Note! If the facing masonry recedes from the main wall, then in every fourth row the bricks should jab at the aerated concrete blocks. Therefore, the length of the spoon is taken into account when choosing the distance between two walls. The resulting voids are filled with insulation.

Weatherized concrete house

It is possible to warm the house from gas-concrete blocks penofol, expanded polystyrene, expanded clay and plates from glass or mineral wool. A vapor barrier made of a vapor barrier, plastic film or glassine should be provided between the main wall and the thermal insulation.

• Before the facing of the facade is arranged, a vapor barrier is fixed on the main wall. If this material is penofol, the facing masonry should not reach the insulation by approximately 3 mm. In reality, the brick is simply not pressed against the insulation.
• Insulation between the two walls is laid parallel to the construction of brickwork. Slabs of mineral wool and foam are fixed to the blocks with plastic or metal nails with special dowels, which are called umbrellas or fungi. Expanded clay is also filled up gradually, depending on the height of the cladding wall at a particular moment.
• All insulating materials (except for expanded clay) at the joints are sealed with construction foam. In addition, insulation should fit snugly to the main wall. Conversely, between the brickwork and insulation should be a gap for air circulation and moisture removal through the specially made holes.
• A special place in the facing of aerated concrete walls is occupied by the area of ​​openings for doors and windows. There should be no gaps in these places - both walls should be connected with sealant, but not with building foam. It is capable of expanding, and can squeeze bricks out of a number. In this case, it is better to use a polyurethane sealant, which needs moisture to set. In addition, he shows himself well with fluctuations in temperature.