Wet facades: what is it? Technical characteristics of a wet facade, its advantages and disadvantages

Many home masters and professional companies are increasingly using today so-called wet facades to ennoble houses. What it is, you need to know before you wonder whether it is worth using this technology to update the exterior walls of the house. Wet façade is arranged using a heat insulator, in the role of which extruded polystyrene foam or other material with qualities that will give the system strength and resistance to external influences is used.

Description

Wet facade, as it is clear from its name, involves the use of a wet method of applying exterior finish. That is why any facade, in the arrangement of which a glue composition or a mixture of a wet type is used, can be called wet.

Used in the work can and semi-liquid adhesive compounds, which is quite possible to buy in ready-made form. You can buy a ready-made mixture or one that suggests additional dissolution before commencing work.

Wet type facade device

In the wet façade there must be three main layers, one of which is heat insulating, fixed to the rough surface by glue. As a rule, a cement-based polymer solution is used as an adhesive. Among its positive features it is possible to distinguish qualitative coupling with a bearing surface and a heater of any type. As a heater, foam can be used. But mineral wool is also used, it is necessary to purchase it for carrying out this kind of work in the form of rigid slabs.

The wet facade assumes the presence of another layer, in which quality the basic material acts. It is based on a rigid interlayer designed to protect the thermal insulation from external mechanical influences. It is on the base layer and the decorative coating is fixed. Traditionally, it is customary to use a polymer-cement solution in tandem with a reinforcing mesh. In most cases, the solution is based on glass fiber with impregnation, which protects against alkali.

If you chose a wet facade, the installation technology assumes that it contains an external decorative coating. The most popular material in this case is textured plaster. It is fairly simple to apply and has little value. In addition, it is also valuable that it does not affect its walls and facade with its weight, since its mass is insignificant.

The advantages of a wet facade

If you are interested in wet facades, what it is, you need to know more. It is worth paying attention to the positive features of this method of decoration. Among the most important, as already mentioned, is the cost. So, if you do the work yourself, then a square meter of finishing will cost about 300-800 rubles, the final price will affect the cost of plaster and thermal insulation applied in the work. Another plus is a fairly extensive color scheme. This also applies to textural solutions. But if there is a need to change the coloring, then the surface can be painted in any shade.

The installation of a wet façade provides for the presence of a thermal insulation material, which makes it possible to obtain a practical finish with thermal insulation characteristics. If you are just starting to build a house and you know that the facade will be finished in a wet way, you can save on work, because the walls will be insulated afterwards. Yes, and on the building materials themselves really save, because the thickness of the walls can be such that it is enough to ensure strength.

Considering wet facades, what it is, it is necessary to understand and take into account that such systems have a negligible weight, despite the multilayeredness. This indicates the possibility of heat insulation of a capital building with stone walls. The frame houses, which are installed on a columnar or ribbon base, can also be ennobled in this way. In view of the fact that the insulation will be strengthened outside the living space, the useful construction area will remain unchanged.

Dew point shift

When you look at wet facades, what it is, it is important to understand. After all, if you do not take into account all the features of such a system, you can make your choice in favor of a less profitable and less attractive solution for your housing.

It is important to take into account also the fact that the location of the insulation outside the outer walls is very appropriate, because it allows you to take out the dew point beyond the walls of the walls. Whereas if the insulation is made from the inside of the room, you have to think about the fight against condensation and condensation on the outside of the sealing material. All these circumstances indicate that a wet facade, the work on which will be done on its own, does not involve problems associated with the formation of fungus and mold on the walls.

Cons of wet facade

It must be remembered that everything has its drawbacks, not an exception - and the system of arrangement of the facade by wet technology. You can do such work only in the warm season. In addition, bad weather can also prevent the continuation of work, which can delay the completion of the process for a while. If you do not take into account this requirement, then on the surface of the facade will remain dirty spots. In addition, the approximate service life of the wet façade does not exceed 30 years, which is significantly less compared to other types of external wall construction.

During the operation, the duration of preservation of the original appearance of the walls can be reduced, this is influenced by temperature changes. Thus, if there is a big difference between their values, this fact can strongly affect the durability of the facade.

Technical characteristics of a wet facade

A wet facade, the installation technology of which requires the use of several layers, can provide for the use not only of glutinous mixtures. If there is a need to reduce the cost of work, then it is possible to use less expensive analogs, but when buying it is important to take into account that the adhesive should have some characteristics, among them it should be distinguished excellent vapor permeability, as well as resistance to frost and external influences. Glutinous mixture can not only strengthen the material, but also to level the surface.

The "wet facade" system, as mentioned above, can be based on mineral wool plates or expanded polystyrene. If you make a comparison, the first option has excellent thermal insulation qualities, especially good basalt slabs. But now many people refuse from fiberglass, as it is not so strong that it makes it vulnerable.

Technical characteristics of heat-insulating layer

If you decide to choose a mineral wool for the arrangement of a wet facade , you need to purchase one that has a tensile strength of 15 KPa or higher. If you use a material that has less impressive strength, the facade will not suffer wind stress.

With regard to density, it should vary between 130-180 kg / m ³ . This requirement should be taken into account so that the plaster layers do not crumble. This material should also be characterized by alkali resistance, which is equal to 12.5 pH or higher. This requirement is due to the fact that an alkaline reaction occurs between the materials, which can damage the thermal insulation. The thickness of the plates is also important. The difference between them should not be more than 3 mm. This is necessary in order to make the facade aesthetic. Water absorption of the material should not exceed 1.5% of the volume of insulation.

Characteristics of a layer of expanded polystyrene

If you are building a wet facade, it is important to choose the right materials . So, if there is foam polystyrene at the base of the thermal insulation layer, then some requirements for strength indicators are required, which can not be less than 100 KPa. With regard to density, this index can vary from 15 to 25 kg / m ³ . Here, too, an even surface is important, the deviation is allowed no more than 0.5%.

Characteristics of the plaster layer and external coating

It is important to take into account that the plaster layer must also meet certain characteristics. Thus, the density of the layer should be in the range of 145 to 200 g / m ² , while the thickness should be approximately 3-5 mm.

It is important for the decorative layer to choose the right material, which must necessarily have increased characteristics of vapor permeability. But the density is recommended to choose the equivalent of 1.6 g / m ³ . If you comply with all these requirements when choosing a material, the wet facade will meet all the characteristics of a quality system that will last for as long as necessary.

Finishing the "wet facade" today does not cease to be popular for the reason that it looks like the house after the work is very presentable, and the costs do not hit the pockets of the owners.