The technology for painting concrete walls will dependon what the building is intended for, in which painting work needs to be carried out. In order to correctly select materials suitable for finishing concrete walls, their humidity should be determined.
Wall painting technology.To do this, take a meter-long piece of polyethylene film and stick it to the wall with tape. After a day, either condensation will form under the polyethylene, which means that the wall is not ready for finishing work, or it will be dry under the test piece: this means that the work will be done well. The main stages of painting concrete walls are cleaning and preparing the surface, puttying, priming and painting.
Tools and materials
The concrete wall is prepared for painting only after it has been checked for moisture. For the work you will need:
Rollers for painting walls.
- respirator;
- roller;
- rags;
- primer;
- brushes of different sizes;
- paint priming and for surface works;
- painting tape;
- sandpaper with different grains of grade 60-100;
- putty;
- spatula narrow and wide;
- clean capacity;
- a paint tray or a mesh;
- stairs;
- protective glasses;
- gloves.
Before work, a new roller needs to be shakenhands, rinse and make sure that its fur does not crumble. Brushes are also tested for strength before painting, so that the bristles do not crumble during work and do not remain on the wall forever. It is best to do this in the store when buying. Return to the table of contents</a>
Features of painting any concrete surface
Painting of buildings located outdoorssky and intended for industrial work, requires preliminary strengthening of the concrete surface and cleaning it from dust and dirt. This will allow you to get a high-quality result.
Wall painting scheme.All concrete walls are exposed to moisture. Using impregnation significantly reduces its impact on the wall and protects the structure from premature destruction. It is recommended to use a fluate solution during the preparatory stage for painting concrete products for internal and external use. This prevents the appearance of white spots on their surface. The applied paint and varnish coating is designed to protect concrete from the effects of external factors that destroy the structure. When working with any type of paint, it should be filtered before applying to concrete and periodically stirred during painting. If this is not done, the end result may be completely different from what was expected. There are many industrial water-based paints for concrete, the use of which may increase humidity. This should be taken into account with high humidity. Painting should be carried out at a concrete surface temperature above 5 ° C. Optimum weather for outdoor work is cloudy, dry, with light wind. It is not recommended to paint the concrete surface if it is heated by the sun's rays. Unsuitable time for work is in the evening. Morning or evening dew, falling on a freshly painted surface, spoils the whole work. Return to contents</a>
We prepare walls for painting works
When doing so, you should wear a respirator and protective equipment.glasses to avoid damaging your eyes and respiratory organs during repairs. You cannot apply paint to concrete immediately. The walls must be carefully prepared. If they have an old layer of paint, it must be removed. To do this, use a spatula or alkali. If there is dirt or soot, prepare a solution of soda ash at a rate of 0.5 kg of active substance per bucket of water, which is used to treat the contaminated areas. The wall is washed with a rag with the resulting aqueous solution and then dried.
Scheme of painting a concrete wall with a roller.Preparing concrete walls requires removing everything that prevents the putty from laying in an even layer. Small rust stains can be removed with a 15% solution of copper sulfate, after treating them with clean water. If the rust has covered large areas, it is covered with rosin varnish. All cracks and chips on the surface are sealed with a repair solution. After removing the remaining paint and stains, they begin to remove roughness. For this, use coarse sandpaper, achieving the desired quality of the concrete coating. The top layer of concrete is given strength with the help of fluate. Its application will prevent the wall from crumbling and spoiling its appearance. This is an aqueous solution of salts and acids, which is used to treat the walls. After cleaning the walls, you need to wait for them to dry. To speed up this process, modern construction uses heat guns and electrical devices that warm the air in the room and greatly reduce humidity. Return to contents</a>The technique for filling walls requires two layers.The first layer is applied to eliminate all irregularities. The second layer gives the surface an ideal smoothness, provided that the wall itself did not have major defects. When choosing a putty, take into account the overall humidity of the place where the wall is located. For dry heated rooms, it is recommended to use dry mixes based on gypsum. At high humidity, dry mixes based on cement are used.
Wall puttying scheme.To properly prepare the solution for work, first read the instructions for using the purchased mixture, which should indicate the proportions. Prepare the putty in a clean deep container, adding the dry mixture to warm water. You need to mix it with a special mixer, but you can use an electric drill with a special attachment as a mixer, which can be bought at a hardware store. The first stage of puttying is called priming the surface. After applying it, do not continue working until it dries completely. The time for this process is indicated on the packaging with the material. After the first layer dries, the surface is sanded with 60-grade sandpaper. After bringing the wall to an ideal appearance, a second, finishing layer of putty is applied. After it dries, the surface is sanded again with 80 or 100-grade sandpaper. Return to contents</a>Priming of concrete walls For concrete wallsa special primer is needed that can penetrate deep into the concrete layers. Prime the surface in several layers using a roller or brush to completely cover.
Tools for wall puttying.It should be remembered that salt deposits grow on painted concrete walls in damp places. Crystals of mineral salts gradually grow and destroy layers of plaster and paint. It is necessary to protect concrete structures from direct contact with the ground outdoors. For this purpose, reinforced primers are used. This can be Enesal SR or Enesal HR, which have increased elasticity, three times higher than conventional waterproofing materials. With them, peeling or swelling of paint does not occur. This coating works well if applied to a dry, durable base that is not exposed to water pressure from the ground. For protection against water, the Enekrit VS system is recommended. This is a waterproofing material that prevents water seepage from the negative and positive sides of the structure. All these are expensive types of insulation that have proven themselves well in industrial facilities with high humidity. They protect painted concrete walls from destruction. Return to contents</a>
The choice of paint and technology of painting walls from concrete
The choice of paint will depend entirely onhumidity of the coating. In order to protect the walls from moisture, epoxy coatings are used. They have increased durability and are used in non-residential or well-ventilated areas. Acrylic-latex paints have low toxicity, and this allows them to be used indoors. They withstand temperature changes well.
Scheme of paint application using a spray gun.When choosing paint for external walls or in damp rooms, choose those that contain antibacterial components that prevent the development of mold and fungi spores. To , you need to limit the work space with masking tape, which is pasted over the ceiling along the line where the walls join it. Using a damp rag, remove all construction dust from the work surface that could settle on the walls prepared for work. Before work, mix the paint until a homogeneous mass is obtained and pour a small part of it into a clean special container, from which it will be easy to apply it to a roller or brush. When working with a brush, you need to ensure that the paint layer is uniform and excess paint does not drip from it. A special mesh or tray for painting is used for the roller. These simple devices will help remove excess paint from the tool. The surface must be painted, evenly distributing the paint and rubbing it well. Usually, the main part of the wall is processed with a roller. Only those areas that are inaccessible to it are left for the brush. It is best to start the work from these hard-to-reach places. These include corners, places behind radiators, areas near electricity meters. To do it right, you need to use a special order of applying paint to the surface. Start working from the top of the wall, going down to the very bottom. At the same time, make movements that create a W-shaped pattern. If the first layer of paint does not lay very well, the primer shows through, then apply a second layer of paint. Remove the masking tape after the paint dries. If necessary, use a thin brush to touch up the places with gaps.
