One of the issues arising during the repair work is the choice of the material for plastering walls in the humid atmosphere of the bathroom. It is important to choose plaster mixes based on cement, rather than gypsum or other unstable materials. Special universal mixtures (Rothband) are suitable, they are allowed to be applied in rooms with high humidity.
Finishing the bathroom with decorative plaster should be done with high-quality, moisture resistant material.
In the building materials market a huge selection of different plaster compositions. Including plasters, which, due to the presence of additives in their composition, possess the property of sanitation. This is an important point for a room where there is a periodic increase in humidity. It is desirable that the composition also included a plasticizer.
Characteristics of plaster.
What is the difference between dry plaster for the bathroom? It is stronger than cement-sand plaster, easier to apply, much harder and does not crack at all. Only a week after the application of the plaster on the walls, putty or ceramic tiles are applied. Its main advantages are as follows:
- blocking the flow of salt and moisture from the walls or foundation to subsequent layers of finishing materials;
- the bathroom is securely waterproofed;
- walls are breathable, vapor-permeable;
- Do not crack when cured, regardless of the thickness of the layer;
- environmentally friendly.
It is important to note that dry plaster is not designed for waterproofing from groundwater, it can not be laid on a gypsum base, only the bathroom is suitable for the material.
The first step is preparing the foundation. It is necessary to carefully remove all previous coatings, coloring, dust, dirt, traces of fat. It is convenient to use the thermal method of cleaning (by heating with a construction hair dryer), the old paint is easily removed. Also special washings for paint are sold.
For a good adhesion of the plaster to the wall, it is desirable to cut the wall of the bathroom with a notch. The depth of strokes is carried out to the level of 1 cm. Dust should be removed at the end of the preparation. On the brick walls notching is required, enough natural roughness.
Scheme of plaster application.
Then a layer of primer, putty, and only after that is carried out the operation of spraying the walls. It will give the necessary strength of the bonding of the substrate and the applied layer of plaster. The spray is carried out by the same solution, but in a more liquid form. Density should be like sour cream. Before the procedure, the wall is wetted.
The layer of the spray depends on the base material: for wood - at least 9 mm, for the rest 5 mm is enough. The resulting layer of plaster does not smooth out and is not smoothed.
The next step is to apply a rough layer. A solution of normal density is placed on top of the spray with a thickness of 5-7 mm. On top of the first application, it is allowed to put additional layers after drying, if necessary, to level the surface.
After applying the rough layer to the surface, it is leveled with a special tool - a half-trowel, its dimensions are about 80 cm. Movements with a half-tine should be done in all directions.
The finishing layer is applied in two versions, depending on the further use of the wall in the bathroom. Either additional material will be laid on the finishing layer, for example, ceramic tiles, or only the decorative layer will fit into the finish layer. What is their difference? In general, the material used differs from the finishing layer and the thickness of this layer. Under the decorative plaster lay a layer of 5 mm, and for further finishing it is enough 2 mm of the finish layer. First the wet layer is wetted with water. Then, using a wide spatula, the plaster layer is uniformly stretched. The angle of the spatula is kept at a level of 15 degrees. The resulting smooth surface, until it is frozen, is rubbed in a circular motion with a grater, moving the hand clockwise.
The structure of the decorative plaster is created by pressing the roller or spatula.
If the idea in the bathroom is an invoice surface, then it is formed with a narrow spatula. At this stage, relief patterns are formed. For the quality of work on the ledges, press the grater harder, and on the grooves - weaker.
The mortar for plastering is quite corrosive and corrosive to the skin and eyes. Observe safety precautions, use gloves and goggles.
It is important to maintain the humidity when working at the same level, when drying drafts are not allowed.
The main features of works with plaster are as follows:
- all weak points are removed to a solid foundation;
- The seams on the masonry are broken;
- For plastering it is necessary to apply a layer of putty for waterproofing;
- traces of highs are carefully removed, if necessary, cut out with a Bulgarian with a metal brush;
- When using gypsum plaster, it is absolutely necessary to mount a retaining mesh for reinforcement on the base;
- the solution is introduced by mixing pure water with the mixture being poured, and not vice versa;
- depending on the purpose of the plaster and putty, a solution with a different density is diluted;
- the mixture loses its properties after 20 minutes, so you need to prepare a little;
- For the passage put a layer of plaster in 3 mm;
- Do not accelerate the drying time by raising the temperature or lowering the humidity.
Many people, when they start repairing the bathroom, refuse to decorate the walls with tiles. Instead, the volume, textured plaster or Venetian became popular. With this approach, you need to take care of the moisture resistance of the walls.
The base before applying the plaster is thoroughly impregnated with a primer, which prevents the passage of moisture and improves adhesion to the substrate.
The most resistant to moisture similar material is the facade plaster. It perfectly resists moisture on the street, not to mention the humidity of the bathroom. It is also possible to additionally coat the plaster layer with a transparent wax-based composition.
Using volumetric plaster will give vent to fantasy and creativity. The result of handmade work will please the look no worse than the most expensive tile.