Plaster for exterior works

Plastering is now one of the most popular methods of wall finishing.

Plastered outdoor works areapplying a relatively thin ball of cement or lime-cement mortar to the outer surface of the exterior walls for decorative finishing or for protective purposes. Mortar - plaster for outdoor work is done on the basis of cement, sand and water. Cement serves to bind individual particles, and sand is the main mass of the mixture. A good quality mortar adheres to any kind of masonry material. Adjust the strength of the solution by changing the percentage of cement and sand, or adding lime, but so that the mixture is not stronger than the materials on which it will be applied. Cement hardens under the influence of a chemical reaction - hydration, which begins when water is added to the dry mix. For setting, the cement does not need to dry completely, and hot weather can dry it too quickly, so it is necessary to maintain the humidity of the cement at too high air temperature, spraying it with water or covering it with plastic wrap to preserve moisture and slow down the drying process.

Plaster for outdoor works is divided into several types according to its properties:

• Protective and finishing plaster.Used for finishing the surfaces to give them an expressive architectural texture and reliability in operation. After this type of plaster, no staining is required.
• Special plaster. This external plaster necessarily has soundproof, heat-insulating, fireproof and radiation-absorbing properties.
• Plaster for exterior works, answeringhigher requirements. Such a plaster can be water repellent, water-retaining, can have increased strength to abrasion or to compression. It is used for leveling the surfaces of elements of building structures.

Also, the plaster for outdoor works differs by types according to its location in the building:

• Plaster applied to the outer surface of the roof;
• Plaster applied to the walls of the basement;
• Plaster applied to the plinth;
• Plaster applied to the substrate above the plinth.

The plaster of the outer walls is made according torules of the plaster system, which regulate the interaction of plaster layers with the substrate and its integrity. To conduct high-quality finishing work, first of all, you need to pick up the composition of the plaster balls. They must be resistant to loads arising between the layers or between the base and the layer due to thermal expansion or shrinkage. To fulfill these conditions, it is necessary that the layers have the same strength or that the top layer has less strength than the inner layer. Considering these rules, plastering systems are made for finishing the outer walls.

According to European standards, plaster for exterior walls should have:

• The uniform adhesion with the base and between the layers throughout the perimeter of the contact.
• High level of adhesion to the substrate.
• Low capillary water absorption.
• High permeability (not less than the other layers).
• High resistance to cracking.
• Low shrinkage.
• Resistance to atmospheric phenomena.
• Frost resistance.

There are also types of plaster on the composition of the mixture:

• Mineral.
• Acrylic. Can be applied to all types of mineral bases.
• Silicone. They have high vapor permeability and atmospheric resistance.
• Silicate. Can be applied to all types of mineral bases.
• Basement. It can be used for leveling and protecting aggressive environments under active influence.