Mixture for plastering walls. Which plaster is better? Mortar for plaster

Perhaps one of the most time-consuming types of finishing works is the plastering of walls, especially if you produce these works yourself without resorting to outside help. It would be a pity to spend money and effort if, after drying, the walls are covered with cracks or material and completely withdraws from the surface, which happens very often if the master does not have relevant experience in construction work. But, of course, not the most important role is played by the variety and quality of the plaster mixture, which you will use for the work. Therefore, the selection of the composition should be approached seriously, since also the success of plastering the walls will depend on this.

For reference

Good plaster can be made by you and yourself. To do this, pick up the ingredients, sift the sand, mix everything in the required proportions and add water. But all this will take quite a lot of time, and the mixture may turn out to be substandard. Therefore, it is best to purchase a ready-made formulation that already has the right amount of dry mixes that require only the addition of liquid.

Features of choice of plaster for walls

You can choose the plaster solution depending on the surface of the wall allocated for the time work, as well as the estimated cost of the composition. In order not to be mistaken, it is necessary to know what plasters are available today. If you need to improve the facade, then you should choose cement-lime or cement plasters. Interior walls are best finished with cement-lime or cement mixtures, as well as gypsum compounds. Depending on the fillers, the plaster may have different quality characteristics. For example, cement as a binder contains the same substance, and the filler is sand. Among the advantages of this solution can be distinguished long-term viability after cooking, a strong surface after drying, as well as low cost. It should be noted and versatility, because such compounds are suitable for both internal and facade work.

Long-term vitality facilitates work, because you can mix several bags at once using a concrete mixer and without fear that the mortar will seize before you have time to work it out. Such mixtures are very suitable for inexperienced masters. And after drying the surface turns out to be resistant to mechanical influences.

If you choose such a dry mix for plastering walls, then you should be ready for some disadvantages. Among them - poor adhesion with concrete and smooth surfaces, the inability to perform a large amount of work per day due to heavy physical exertion, as well as the formation of a large amount of dirt. Cement will cure for a long time, so the repair work will stretch, and further finishing can be resumed only after 2 weeks. The works provide for the necessity of preliminary puttying of the walls. During drying, the room will retain a high humidity, to crystallize the particles need water, so during drying, you need to spray the surface with water, which complicates the process. If the room has wooden structures, then high humidity can cause them to deform.

Since the solution will have to be thrown on the wall, a large part of it will fall to the floor, forming a lot of dirt, in addition, this can lead to over-consumption of the mixture. But this is not the only source of dust, because when kneading a solution, the cement particles will rise into the air, getting into the respiratory tract, which is known to be harmful to health.

Cement-lime plaster

If you are pondering over the question of which plaster is better, you can pay attention to cement-lime mixtures, which consist also of sand. Advantages are the possibility to use the composition for internal and external works, as well as for rooms, the conditions of which are high humidity. After applying to the walls, the cement-lime composition gives them antibacterial properties, excluding the development of the fungus.

The composition is convenient to apply, since it has an elastic consistency and fits well with the surface. But the plaster solution will dry for about 4 months, in addition, the mixture is demanding to comply with the technology. If the surface preparation is not carried out correctly or the drying recommendations are not followed, the wall will crack and become loose. Dust from lime plaster is no less harmful than from the above described composition. If the solution gets on the skin, it can cause irritation and ulceration.

Gypsum plaster

Gypsum plaster mixture has fillers in the form of mineral additives. The color of the composition can be gray, white or cream. It dries quickly, which allows you to shorten the time of finishing works. For the preparation of walls, they do not need to be putty, the mixture is ductile, it does not slip off the surface during operation, and it can be applied in two layers, which makes it possible to treat about 40 m ² per day. Mud and dust will be formed less, among other things, the composition is non-shrinkable and is not covered by cracks after drying.

Disadvantages of gypsum plaster

If you are faced with the question of which plaster is better, then perhaps it is worth considering whether to acquire a plaster composition, as it has many shortcomings. Among them it is necessary to single out: small viability, instability to mechanical influences, and also moisture. The prepared mixture you will have to work out within 40 minutes, which requires the presence of professionalism and special skills of the master. Gypsum compounds are not used for external works, since they are unstable to atmospheric influences.

Adhesive plaster

Mixture for plaster walls can be glued. It includes polymeric additives, sand, special fibers and cement. As a rule, this mixture is used to install a heater, but it can also be used for plastering walls using a mesh. Due to the fact that the adhesive plaster has a high cost, the area of its application is very limited.

Preparation of plaster by yourself

Having studied the ratio of ingredients, you can create a solution for wall leveling on your own. The proportions of the lime plaster are as follows: 1 part of the calcareous dough, 3 parts of sand. The proportions can be slightly changed if the fat content of the lime is excessive or insignificant. Thus, for one part of the lime, 1 to 5 parts of sand may be needed. After the ingredients are combined, the composition should be mixed, gradually adding liquid and sand.

Cement-sand plaster: preparation

Materials for plaster on cement-sand base are also connected in accordance with the proportion. To carry out the work you will need cement, sand, lime and water. First, a part of the cement and 4 parts of sand are mixed, after which 0.1 part of the lime can be added. Gradually, the liquid is added to the solution until it is possible to obtain a mixture of the desired consistency. Depending on the brand of cement, the proportions can vary. If you want to prepare a mixture for plaster walls of cement grade M200, then sand and cement should be combined in a ratio of 1 to 1. When using M500 cement, prepare the sand in an amount of 5 parts and cement in a volume of 1 part.

Other criteria

If you still can not find the right mixture for plastering walls, then the materials based on them should be guided. In the presence of a foam concrete surface that has a porous structure, it is best to purchase a gypsum mixture. You can buy cement mortar. But it should be noted that the foam concrete has good absorbency, and the plastered surface will require water spraying. If you have to work with wooden walls, then they are best suited plaster on the basis of cement and lime, which is applied to the shavings from shingles. At a price, gypsum plasters cost more compared to cement plasters. However, if we take into account the consumption of gypsum plaster, the cement plaster will cost much more. After all, if you put the first option in a centimeter layer per square meter, then it will take 10 kg, while the cement composition will be used up in the amount of 16 kg.

When choosing a mixture for plastering walls, do not buy it in large quantities. First you need to take two packages, and then test them in the work. If the setting time corresponds to the instructions, you can purchase the right amount of the mixture. It is important to exclude improper storage of gypsum plasters, since in this case it will solidify within 10 minutes after the addition of water. But if the necessary quantity of cement is not reported to the cement plaster, it will creep along the wall during the application process.

Choosing the best plaster by manufacturers

As experts recommend, you should not buy mixtures that are made by little-known manufacturers. The most popular product on the market today is the one supplied by the German company Knauf. It produces quality blends, and the price for this product is slightly higher compared with domestic products. Among the latter, the companies Starateli, Founding, Eunice, Volma and Kreps have proved themselves. The quality of "Starateli" is not inferior to Knauf. But if you buy a large batch, then the difference for a package of 30 kg can become tangible.

Characteristics of gypsum plaster of the brand "Knauf Rothband"

If you decide to prefer to level the walls in a mixture of "Knauf Rothband", you should familiarize yourself with its characteristics. It is intended for high-quality plastering of walls and ceilings that have a solid base. Here you can include cement plaster, concrete, bricks and surfaces made of expanded polystyrene. Smooth concrete surfaces are particularly suitable for processing. You can use this composition for finishing rooms with normal humidity and in bathrooms, as well as kitchens.

Plaster of gypsum "Knauf Rotband" (30 kg) is applied by a layer, the thickness of which can vary from 5 to 50 mm. With a 10 mm layer, you will need 8.5 kg per square meter. When mixing, approximately 20 liters of water per 30 kg bag will be taken. The surface will dry for 7 days, but the ready solution should be used in 25 minutes. The compressive strength will exceed the index of 2.5 MPa, while the flexural strength is 1.0 MPa. Plaster gypsum "Knauf Rotband" (30 kg) is a universal mixture that provides increased adhesion to almost all materials. Packing of the above-mentioned volume will cost the consumer 370 rubles. If you have to work with highly absorbent surfaces, then they are primed with a primer.

Characteristics of gypsum plaster "Volma-layer"

Plaster "Volma", the price of which is 280 rubles., Does not require preliminary puttying and can be applied by hand. On a square meter with a layer thickness of 10 mm will take approximately 9 kg of dry composition. Such a layer will dry up within 24 hours, and as a rough surface, brick, gypsum or cement plaster, concrete or gas block can be used. It is necessary to make the solution after cooking for 45 minutes. For the facade works the plaster "Volma", the price of which is quite acceptable, is not used. Apply it can be a layer from 5 to 60 mm.