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Plastering walls for painting

Plastering walls for painting

Plastering walls for painting
The quality of repair largely depends on whether the plastering of walls for painting is done correctly. If the technology was followed, and the materials were chosen taking into account the surface of the walls, the rooms will look presentable, the coating will last for many years. In this article, we will talk about important rules that everyone who plans to repair with their own hands or looking for professional builders-finishers in Moscow should know.

Why plaster the walls for painting

Before painting, carry out a preliminary alignment of the walls in order to:

  • eliminate minor defects (irregularities, misalignments, roughnesses);
  • seal seams between panels (blocks), cracks;
  • get rid of “loose” places and peeling of the old layer of putty;
  • increase resistance to moisture, temperature differences in the atmosphere.

If preparation is not done, the light will be clearly visible imperfections – even the smallest bumps, pits. On a smooth surface, the paint will be perfectly flat. The same can be said about plastering for wallpaper.

Plastering for painting reduces heat loss during the cold period, increases durability, creates a barrier that prevents the negative effects of external cladding factors.

Plaster begins to spill out of old masonry joints over time. To bring such houses into a decent appearance, it will be correct to treat them with a plaster mortar. It is carefully applied first to the joint, and then to the entire wall. Before this, it is necessary to remove loose areas.

Double plastering inside the house is applied to thin interior partitions in one brick – it strengthens them, makes them more durable, especially if you know how to properly plaster under painting.

The quality of repair largely depends on whether the plastering of walls for painting is done correctly. If the technology was followed, and the materials were chosen taking into account the surface of the walls, the rooms will look presentable, the coating will last for many years. In this article, we will talk about important rules that everyone who plans to repair with their own hands or looking for professional builders-finishers in Moscow should know.

Plastering brick walls

Plastering for painting is not always necessary. The following are cases where it is necessary.

  • Brick masonry to paint. Plastering in new buildings is performed in the presence of irregularities, if there are voids in the joints, not filled with mortar and for better insulation. For old housing is relevant another reason – the presence of cracks.
  • Concrete for painting. As it has a smooth surface, before applying cement mortar, it is necessary to install a reinforcing mesh, and the base is carefully primed.
  • Gas blocks, foam concrete for painting. Plastering for painting should be done due to the fact that these materials are highly porous. Plastering aerated concrete and aerated concrete will improve insulation, prevent the accumulation of moisture in the voids.
  • GKL (gypsum plasterboard). Plaster becomes a protective shell for fragile gypsum board sheets, contributes to the alignment of joints and concealment of fasteners.

Requirements for plaster for painting

Take into account the compatibility, the conditions of application, operation, the characteristics of the material. These data are specified by the manufacturer on the package.

  • Plaster a brick or concrete wall with an ordinary cement mortar. This is an excellent solution for damp rooms. It is not afraid of getting wet.
  • For foam concrete, gas blocks, moisture-repellent plaster is used.
  • For plasterboard, it is optimal to use gypsum mixtures, they are perfectly compatible. Plaster plasterboard before painting should be based on their type (there are ordinary and ceiling, waterproof for bathrooms and swimming pools, fireproof for fireplaces, flexible arched with fiberglass reinforcement threads, water-resistant, combined with polystyrene foam in the composition for insulation), and then on the entire wall. Before this, it is necessary to remove loose areas.

Double plastering inside the house is applied to thin interior partitions in one brick – it strengthens them, makes them more durable, especially if you know how to properly plaster under painting.

What mixes are best to use

In construction stores there is a large selection of plasters for painting. You should choose guided by the composition, purpose and specifics of application.

For plastering walls for painting, three main types of mixtures are used.

  • Gypsum mixture
  • Gypsum plaster mixtures

Its advantages are:

  • safety;
  • light weight;
  • low consumption;
  • non-combustibility, good heat and sound insulation;
  • easy to apply, after drying does not shrink, creating a smooth surface;
  • possibility of restoration;
  • provides a good microclimate due to hygroscopicity (absorption and return of moisture).

Cons:

  • Used only for interior finishes;
  • not suitable for the bathroom due to high humidity;
  • costs;
  • has a low frost resistance;
  • requires experience and small mixes, as it hardens very quickly after application.

When diluting gypsum mixtures, follow the instructions. Pour them into a container with water and mix with a mixer at low speed. Otherwise lumps will form.

Cement mixture

The cement compound is a popular and affordable one. The classic mixture: high quality cement, well sifted river sand and pure water. Additionally, manufacturers add components that increase moisture-repellent characteristics, improve plasticity.

Scope of application: finishing basements, bathrooms, kitchens, other rooms with high humidity. Advantages – frost resistance, repairability, durability, water resistance.

Minus – plaster will take longer to dry – it will take at least 12 hours to dry completely. The strength is gained within three weeks.

Polymer mixtures

Such mixes are made from polymer or mineral components. They are resistant to high humidity, but it is more difficult to work with them because they do not have good plasticity.

The advantages of polymer compositions are:

  • high strength
  • no shrinkage;
  • preservation of properties at any temperature conditions;
  • absence of harmful additives;
  • versatility – for all surfaces inside and outside buildings.

disadvantages

the surface of the walls must be even (its preparation should preferably be entrusted to professionals);
high price of the material.

Polymer plaster mixes

Buy plaster mix with reserve (at the rate of 10-15% of the required mass). It will be needed if the diluted solution has not been fully used in time and has had time to dry out.

What tools are needed to prepare the surfaces

To apply plaster walls for painting, the following set of construction tools is used:

  • plaster;
  • a container for mixing;
  • for even mixing – a mixer or a drill with a special attachment in the form of a whisk
    level;
  • plaster beacons;
  • rollers and brushes for applying primer;
  • one-sided adhesive tape (it is necessary for sealing sockets, platbands and other elements that can get dirty with plaster) a set of trowels;
  • trowel;
  • trowel for the final grouting of irregularities and roughnesses.

rags.
A thin trowel is used for the application of the composition and its alignment during plastering of walls and ceilings made of gypsum plasterboards. A wide trowel is used for applying the closing layer.

Trowels for plastering

Stages of plastering work for painting
Correct execution of the given instructions is the key to the quality of the plastered surfaces. The classic approach for plastering brick walls, concrete, paneled, block houses:

  • Installing beacons along the surface under the plaster. This is a guarantee that it will be possible to perfectly level the walls or ceiling.
  • To increase adhesion and get rid of dry dust, a primer treatment is performed.
  • For large differences – spraying the surface of the ceiling or walls with a liquid plaster solution. If the plane is relatively even, this step can be skipped.
  • Dilution of a thicker mixture, its application and leveling with a rule.
  • A thin finishing layer – to eliminate the smallest imperfections.
  • Grouting for the final sanding.
  • Decorating (at will). When working indoors, most often – painting or wallpaper.

If the walls are covered with gypsum board, the algorithm will be somewhat different. In this case, cut the chamfers with a knife, clean the joints, remove the dust. After the application and drying of the primer, proceed to puttying. The final layer is applied to the reinforcing mesh. Smooth out any irregularities with a float.

The walls can be painted after the composition is completely dry. The time depends on two factors: the thickness of the plaster layer and its composition.

During the application of plaster for painting observe the temperature regime. Optimal – in the range from +5 to +30oC. Humidity – not higher than 60%. Shutters and doors are closed to avoid drafts. Do not use heaters.

For safety, do not forget to disconnect the wiring!

Manual and mechanized plastering – what to choose
Plastering walls for painting is performed manually or mechanized, using machines. Plastering stations do not require pre-mixing of the solution, the liquid and dry composition are mixed in the process. Due to this you can achieve savings on materials, because there will be no waste of diluted mixture, not used up to the time of its drying.

Application of mechanized plaster

Advantages of the mechanized method:

  • high productivity, with large volumes it allows to significantly reduce the repair time;
  • homogeneous mixture, which guarantees the evenness and durability of finish;
  • Dense adhesion of plaster without voids;
  • affordable price;
  • lower consumption of plaster due to splashing, saturating the composition with oxygen bubbles;
  • Machine mixes are cheaper by 15-20%;
  • High level of quality when hiring professionals.

Minus manual work – the preparation of the solution in small portions. Even an imperceptible change in proportion when diluting the mixture and changing the consistency leads to the fact that the wall dries unevenly. Subsequently it becomes the cause of cracks, unevenness, and crumbling.

The process of mechanized plastering is somewhat different from manual plastering. But without proper experience, using a machine that speeds up and simplifies plastering does not guarantee good quality. We recommend using the services of specialists who will do it quickly and at the highest level.

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