The main requirements for external plasters

Our climate quite aggressively affects the external surfaces of the buildings, partially destroying them. Firstly, the walls going outside are rarely dry. Wet snow, fogs and rain saturate the outer surface of the wall with moisture.

Dissolving, the components of the plaster begin to move to the outer surface of the wall. There they partially dry out, partially interact with carbon dioxide and form not very beautiful white spots on the walls – highs.

Secondly, the walls are subjected to cyclic alternating temperature influences all year round. In the afternoon, when the sun shines, they warm up to positive temperatures, and as soon as the sun sits down, they begin to cool and freeze. Freezing at the pores and capillaries, the water increases in volume and expands its container. The internal stresses arising in this case lead to the formation of microcracks and the disclosure of pores.

Therefore, the cruel world of the outer environment is presented to the plasters for external work high requirements. They should be durable, water, frost and atmospheric, not to let water inside and, at the same time, let the steam out. It is desirable that they are elastic in order to compensate for seasonal thermal deformations of wall materials. With all this, they should be durable and delight the eye with freshness of color.

Technical norms set forth in SP 42.13330.2011 Urban planning., They will help novice architects and urban planners to understand the intricacies of urban construction planning. Developers can also be guided by technical norms and comprehend the nuances.