When performing plastering, the most critical step is to finish in the corners. To make the angle smooth and clear, without any defects (influxes and depressions), one desire is not enough. Need experience, attentiveness and knowledge of the nuances. Professionals kindly share secrets on how to plaster a corner of a wall.
If the angle is a curve, then it is almost impossible to evenly install furniture or appliances. Any deviations will be clearly visible. Pictures, panels, photographs can not be hung near the corners. All this will emphasize errors in the decoration of wall joints.
Tool and material
To successfully implement the decoration of the corners with a mortar, you will need a certain set of tools for wall plastering. For work, you need a trowel, trowels of different sizes, usually plaster spatulas, as well as special spatulas for working in corners. When buying spatulas, you need to consider that the angles are different, and the blades for the outer and inner corners are also different. In addition, you should prepare the capacity for the plaster, square, plumb and level.
It is worth choosing the right supplies for work. It is important to prepare leveling solutions. The plastering of the corners is carried out with the same material that was used for the decoration of the walls. Next, you will need a special corner, which will greatly facilitate the process.
It is of various types. Most often, for plastering corners, a steel or aluminum perforated plate is used. It has sufficient strength and will well protect the wall from chips.
Instead of a perforated galvanized corner, you can purchase a plastic overlay. Plastic is not susceptible to corrosion processes, and some models can even be bent at certain angles to work with curved walls or surfaces. The cost of a plastic product is almost the same as that of a steel corner.
Combined products can be purchased to apply a second layer of leveling mortar. On the sides there are strips of metal or fiberglass. Fiberglass is resistant to alkali, therefore, such products can be used if the wall is leveled with cement mortar. In this case, it will be better than if the work was carried out using a galvanized perforated corner.
Mixtures and solutions for plaster
In finishing works, gypsum-based mixtures are used. This material is easy to apply. If you fully comply with the technology, the composition will be very durable and the service life will be more than 15 years. The mortar layer on the wall should be approximately 50 mm thick. If there are recesses, then in isolated cases it is allowed to increase the layer to 70 mm. If work is carried out on the ceiling, then the layer thickness should be no more than 30 mm.
Put plaster on brick, concrete, plaster and sand-cement surfaces. Solutions for wood are not intended.
In order for the surface not to rot in the future, as well as for protection against mold and fungus, it is necessary to pre-treat the corner with special impregnations.
In the process of preparing the stucco mixture, it is important to fully comply with the instructions. The amount of water and powder is usually indicated on the package. It is important to keep proportions exactly. If you add less liquid, then the process of applying the solution will be complicated. The likelihood of cracking the surface after drying will also appear. If there is too much water, the mixture will not be able to fill the voids in the corner and gain strength.
Experienced specialists who know exactly how to plaster a corner of a wall do not recommend diluting the mixture with technical water - it should be clean and free from impurities. Since the solution is quite thick, stir it with a mixer for about 2-3 minutes.
Preparatory stage
Before applying the plaster to the walls, it is necessary to prepare the surface. With a puncher or any other tool, they knock down all the protrusions, and also remove the weakened areas. Further, the entire surface should be cleaned from dust. Particular care must be taken to remove oil stains and old paint - such places are very problematic.
At the last stage of preparation, you need to treat the walls and corners with a primer.
Rail Installation
To install a perforated galvanized corner, beacon profiles are mounted on the surface. They need to be set strictly according to the level. A thick solution is applied to the edge of the surface. The layer must be of sufficient thickness to securely fasten the part at the desired distance. Next, the pad is cut in height and glued to the bearing surface.
To accurately set the corner, its position is adjusted using a level. The corner must be shifted until it is in the right position.
Internal corners are glued with plaster grids. A special tool for wall plastering and devices for solving this problem are used very rarely - at the junction point the wall does not experience special stresses.
If the layer of the solution is thick, then the corner is attached to the screws. At the same time, fasteners are used with corrosion protection or stainless. If you use ordinary fasteners, then in the future rusty elements will be visible through the finish.
Outside corner finish
After drying the solution on which the corner was fixed, you can begin processing the corners. The inner and outer corners are formed differently. We will consider what to do in each situation.
To finish the exterior, the solution is poured with a trowel. A lot of material is laid along the surface. Using the rule, remove excess plaster from one wall, and then from another. The rule is based on a corner and on lighthouses.
Spatulas and trowels correct defects after the rule. If necessary, add a dumb solution and smooth the recesses. Then, with longitudinal movements of the spatula, the planes are completely leveled.
Inside corner
Now let's see how to derive an inner corner. The scheme will be a little different. First of all, the lighthouses are set so that the planes of the walls are connected at 90 degrees. If there are several angles, then they retreat a little from the perpendicular - this will not be visible.
Next, one wall is carefully aligned along the lighthouses. This is done by the rule. At the same time, the process is adjusted using a trowel and a spatula. When one wall is seized, an adjacent plane is treated. Those who know how to apply plaster on the walls recommend using a trowel not with a straight, but with a beveled blade. Such a tool will not touch the finished output plane.
To form an angle, you will need a special tool - a spatula with a curved blade. This tool is carried out from top to bottom and remove excess material. Clear contours are also created.
Finishing work
How to plaster a corner of a wall? It is still necessary to complete the finishing part of the work. When the solution sets, it needs to be wiped. The choice of grouting depends on further work - if putty is to be done, then it is rubbed to remove gross defects. If wallpapering is done, then the finish is better.
You need to overwrite in a circular motion. The corner is processed as accurately as possible. It is more convenient to grind an internal corner emery folded in half. You can use a wooden wedge.
Conclusion
The article described how to plaster a corner of a wall with your own hands. With certain skills, as well as with the necessary tools, doing this work is not so difficult.