Drywall plaster: how and how to do it?

Drywall plaster: how and how to do it?

Plastering is applied to many materials: bricks and various types of concrete blocks. There is a popular belief that there is no need to plaster drywall. But this is a mistake: there are many situations when such work is necessary. When performing it, there are subtleties and nuances that must be taken into account by all builders. Much attention should be paid to the methods of applying the solution to the seams or borders of the sheets..

Peculiarities

Drywall is used to make a partition, wall or tiered ceiling. It allows you to hide curved surfaces while steadily replacing wet finishes. Plastering the gypsum board with gypsum-based mixtures is possible in a dry room. For moisture-resistant sheets, it is recommended to use a cement mixture, and polymer materials can be used in almost any case..

Why do it?

Everyone knows that drywall is almost perfect – there is no particular need to align it. Plaster is used only to improve the appearance of the sheets. But these compounds must be applied in other cases, when it is required to cover the joints between the sheets, various grooves and self-tapping screws sticking out.. In fact, the function of putty is assigned to the plastering compounds, they are used when they will stick wallpaper or lay tiles on drywall. Under decorative plaster, such material is also quite acceptable..

There is a serious discussion among specialists whether it is possible to plaster drywall sheets in principle. Some of the disputants indicate that a low-quality material with an insufficient level of moisture resistance cannot be covered with plaster: this will lead to gradual deformation, since the applied layer will be damaged by the released moisture.

There is also an opinion that it is quite possible to use gypsum plasterboard. Without going into the solution of the question of who is right, it is necessary to indicate that such processing is acceptable only in strictly necessary cases..

When walls sheathed with GKL sheets have pronounced deformations, the plaster layer will only worsen the situation.. It would be much more correct to remove the cause of the distortions, rather than fight against them. It is another matter if only minor deviations from the normal relief are found. It is also required to apply the basic plaster before decorative plastering. It allows you to guarantee faster drying and improve the polymerization process..

Material selection

When it is required to close the joints or the caps of the self-tapping screws, gypsum-based dry plaster is used, although some craftsmen prefer to use completely ready-made pastes in buckets. For moisture-resistant drywall sheets, it is better to use acrylic-based mixtures.

The actual difference between putty and plaster comes down to the grain size of the material. By reducing it, the developers make the applied layer thinner, moreover, it becomes less rough. It should be noted that in any finishing material the real size of fractions is less than the maximum indicated by the manufacturer. But at the same time, in the production of putty, the raw materials are sifted more carefully than in the production of plaster..

To level out significant depressions and pits, it is advisable to first apply plaster, and then, when it dries, complete the process with a putty. To mask the joints, it is advisable to immediately use the putty.

Experts consider the gypsum variety to be the best type of plaster on drywall. But it is also inferior to putty mixtures, because it does not allow creating the thinnest possible layer. As for the brands, the best solution is considered to be the Rotband material from the well-known Knauf company. In addition to basic coatings, you can use a primer of the “Concrete-contact” type. But no formulations will help if they are used incorrectly..

Preparation and tools

To process drywall, you will need the following materials and tools:

  • ready-made dry or pasty mixture;
  • container for the preparation of dry formulations;
  • primer;
  • spatulas with a narrow and wide blade;
  • mesh for painting;
  • paint brush (preferably several different in length);
  • construction knife;
  • grout fixtures.

Finishing technology

There are universal points that must be observed regardless of the type of front finishing..

The edges of the plasterboard walls should be cut at an angle of 45 degrees, and a right angle is formed at the intersections of the sheets. For chamfering, small planers are sometimes used to help prepare the material before attaching it to the wall. Then dust is removed with brushes or brushes, and the chamfers themselves are primed (this helps to exclude cracking of the seams). To mix the composition, it is imperative to use cold water..

The seams of drywall sheets must be filled with putty and aligned along the entire length. For this it is recommended to use narrow spatulas..

Then the solution is covered with a reinforcing mesh, which needs to be pressed a little. Then the mesh must be completely covered with an additional layer of putty. A spatula with a wide blade is already used here..

Drywall processing at the joints is as follows:

  • chamfer edges;
  • primed the treated area;
  • grease it with putty;
  • cover with a reinforcing mesh;
  • use a final layer (for a flat seam, it is recommended to use a mesh);
  • all ends by rubbing the coating with fine floats.

For painting

Each version of plastering gypsum board has its own characteristics. Preparation for painting the material is no exception. It is performed by any true professional to guarantee the actual quality of the coating. The leveling of the layer is carried out with spatulas with wide blades, then the material is rubbed to perfect smoothness, and a primer is applied on top. Modifying drywall with sandpaper. You need to work very carefully, because the paint will not only be unable to hide defects, but will only emphasize them..

Under the wallpaper

The imitation of wallpapering walls is created with cellulose-based mixtures. Various fillers are added to it: silk, cotton, acrylic. Also, the composition of liquid wallpaper includes pigments and some other components. These mixtures are supplied in bags and are slightly moistened with water before use. The walls need to be primed, the material itself is leveled with a spatula after application.

“Rotbandom”

This is a really high-quality composition of German production. But for him, good surface preparation is very important with the help of deeply penetrating soil, which improves adhesion to the applied material. No less significant is the fact that the primer interferes with the impregnation of drywall sheets with water, which inevitably escapes from any plaster.

When applying the primer mixture, any gaps are unacceptable, and the joints are glued with tapes (serpyanks), and then covered with special strengthening compounds. On a dried surface, such lines are rubbed, removing small deformations and sagging.

To work with Rotband, a spatula with a blade of at least 30 cm is recommended, it is held at an angle of 30-40 degrees. Strong pressure is contraindicated: it will provoke the appearance of waves.

If the defects of the original surface are significant, they work in two steps: 0.3-0.5 cm for each. The final composition is applied to a maximum of 0.1 cm, the most insignificant deviations from an even layer are unacceptable. After drying (taking 24-48 hours) the plastered walls will be perfectly white.

Decorative plaster

Decorative plaster can also be applied to drywall surfaces. The Venetian version of the coating is distinguished by a combination of various colors and a glossy outer layer. In addition to completely ready-made mixtures, there are do-it-yourself ones: they are prepared by adding various colors to the universal gypsum material. Most often, the first layer is made white, setting the future relief, the second one determines the texture and color. With the third layer, they enhance the tonality, make single segments lighter or darker.

The textured type of plaster is distinguished conditionally, because almost any mixture allows you to create an elegant relief. But there are already familiar for professionals options like “bark beetle”. Depending on personal needs and taste, you can choose abstract compositions and geometric shapes. Any builder, at least minimally experienced, will be able to make both a duplicate pattern and a chaotic image..

The tools used are varied: these are not only spatulas, but also trowels, sponges, specially ordered dies, coarse wire brushes, and the like..

Arch plastering also has its own characteristics. First of all, the perimeter is thoroughly cleaned, the same manipulation is carried out with the joints. Next, the ends are ground, which protrude at least slightly beyond the contours of the arch. Then the drywall is thoroughly impregnated with a primer, the protrusions are covered with a perforated corner. Then a reinforcing layer is used – this is where the preparation is over.

Tips & Tricks

      Quite often, a situation arises when there is no time for an accurate calculation of proportions. Then it is necessary to use an indirect method: ½ of the container is filled with water, then the material is added to it in small portions, after which the resulting composition is distributed as uniformly as possible over the surface. When the plaster or putty stops going under the water, you need to start stirring it. The best tool for mixing plaster and putty is a small trowel.

      It is always necessary to monitor the suitability of the prepared solutions and the drying time, which are determined by the type of binders.. Gypsum mixes become 100% solid after 60 minutes (example – “Knauf Uniflot”). If you take “WEBER-BETONIT” with marble filler, the operating time can reach 48 hours.

      The caps of the self-tapping screws must be sunk into the sheets, they are covered with a small mass of putty, which is leveled with a spatula (its movement starts from the top left).

      Why it is necessary to plaster drywall, see the video below.

      About the author