The technology of finishing the entire facade using the so-called wet method has gained immense popularity due to the minimum number of cold bridges, which are very typical for other methods of facade decoration in large quantities. Although this significant factor is not a defining advantage of this technology. The thing is that a wet facade favorably affects and contributes the removal of the dew point outside the entire residential building, precisely due to this, even with a significant temperature difference, condensation will not accumulate on the walls inside the room. We will consider step by step the entire technology of a wet facade, and the choice of finishing building materials for all facades and other features.
During the preparatory stage, you need to correctly evaluate the base, which will further serve you for applying all technological layers.
All walls must be cleaned of any contamination, and when installing a wet façade, the surface of the existing finish must be tested for adhesion and load-bearing properties and characteristics. Possible damaged areas of the old finish must be removed, replaced with whole ones, and if there are certain irregularities, the entire surface must be leveled with a special plaster solution. If your facade is faced with a special highly absorbent material, then you must provide for its high-quality primer. In addition, you need to remove the old layer of plaster from all the slopes of windows and doors.
This technology of wet facades determines the transition to the next stage, which includes the installation and installation of the profile strip.
This design serves for a more even distribution of the entire load from the thermal insulation boards that will be installed next, as well as for certain protection of the lowest row of insulation boards from dampness and moisture. Profile fasteners are performed according to the following rules: the profile must be installed at a height of 0.4 m from the ground level, while leaving a gap between horizontally existing strips of 3 mm in case of expansion of the temperature regime.
The profile can be fastened using special dowels and self-tapping screws, their number per running meter is usually chosen depending on the mass of the used heat-insulating material. Usually, this step is 15-20cm, not more.
To install the profile at the joints of the corners, a specific corner profile is used.
Mineral wool slabs or expanded polystyrene (polystyrene) slabs are used as insulation for a wet facade. Fastening and installing them is carried out by the glue method according to these rules:
- From the edge of the plate it is necessary to retreat about 3 cm and apply the glue solution in a wide strip around the entire perimeter of the plate.The glue is applied to the space that has formed in the middle using the dot method. With this method of applying glue, it should be at least 40% of the entire area of the slab.
Important advice! If you use lamellar mats as insulation, cover them completely with glue.
The wet façade technology includes the spreading method of laying all panels. With this method, press all the insulation tightly both to the wall and to the adjacent slabs. Any excess glue that will form must be removed immediately. Fastening of the insulation must be done in rows, from the basement profile from the bottom to the top.
After a few days, when the glue is completely dry, the thermal insulation layer should be additionally reinforced with expansion dowels.
The length of such dowels is selected based on the thickness of the existing insulation board, adhesive layer and the old coating, and also one should not forget about the degree of deepening into the wall.
As a rule, the size of the deepening into the wall for wall solid materials varies from 5 cm to 6 cm, for porous materials it is 9 cm. The number of dowels per square meter of area will be 5-15 pcs. depending on the weight of the entire insulation and its thickness, the diameter of all fasteners and the height of the plate mounting.
Before attaching the dowels under it, you must make a nest. With proper fastening, place all clamping sleeves flush to the surface of your insulation.
Proceed with the device and installation of the reinforcing layer a few days after laying the heat-insulating layer.
The main thing is to process all corner bevels of windows and doors, all joints of vertical slopes with their lintels and the outer corners of the structure, and only after that the smooth sections of all walls. The installation of the reinforcing layer looks like this: a special glue must be applied to the insulation layer, then a building reinforcing mesh made of special fiberglass needs to be drowned in it.
Apply a cover layer of the same quality and composition over the entire mesh. As a result, the entire reinforcing layer should not exceed a thickness of 6 mm, and its mesh from the surface should be no more than 3 mm.
After the entire reinforcing layer has dried (it takes about a week), apply a finishing layer of plaster suitable for external use on top of it.
The outer plaster layer has a sufficiently high degree of moisture resistance, steam permeability, resistance to mechanical, as well as to various climatic and atmospheric influences.
The quality and term of use of the facade plaster will directly depend on the conditions in which this type of work was performed.
The best conditions for plastering a wet facade is the optimal temperature regime within +6. ...+32, natural or artificially created shade, no precipitation and strong gusty wind.
It must be borne in mind that all the types and advantages of the wet facade described above, according to their technology, have some minor features and layers, if we talk about their structure and installation in the basement. These features are as follows: before starting to work, be sure to thoroughly waterproof the basement part of the wall and the ground area that is adjacent to it. Choose insulation with a reduced moisture permeability coefficient. Additional fastening of thermal insulation boards using dowels is permissible only at a certain permissible height (at least 0.3 m) from the ground level.
The reinforced layer for basement floors is produced in two layers. Ceramic slabs, special facade slabs made of natural or artificial stone, or mosaic plaster should be used as cladding for the basement and the surrounding area.
All finishing work on the installation of a wet facade should be performed after the installation and installation of the roof, windows and doors, laying all electrical wiring, initial interior decoration, as well as complete shrinkage of the new building.
We have described the technological map for the installation of a wet facade, with a clear and competent observance of which the service life of the outer layer of insulation and decoration will be at least 25 years. In addition, a cozy and comfortable thermal and humidity temperature regime will be provided inside the entire frame house.
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