Despite the rapid development of science in the field of building materials, gypsum plaster, which people have used for a long time, does not give up its position. The scope of its application remains quite wide. It is based on gypsum binders . It is used for finishing work in domestic premises (without high humidity) for leveling horizontal, vertical and other surfaces. It is used as the basis for applying finishing putty or decorative finishes.
Universal gypsum plaster is used for decoration of office, retail and residential premises. The use of this material allows to obtain excellent surface quality, which, if it does not exclude puttying, then minimizes them to the utmost. After finishing this plaster, the surfaces of walls and ceilings are almost ready to apply decorative coatings, such as structural or smooth paints, wallpapers, and decorative plasters. This material provides high adhesion with various decorative materials. Moreover, the occurrence of cracks in the gypsum layer is extremely rare.
Compared to other types of finishing materials intended for surface treatment, gypsum plaster has the following advantages: it combines in one step the work of plastering (leveling the surfaces) and preparation for applying decorative finishes (putty); Allows for one application to smooth the surface with rather thick layers (up to 10 cm) without the risk of cracking or peeling; its specific gravity is 2.5 p. less than cement plaster.
Gypsum plaster is non-shrinking, so no cracks appear in it. Solutions from it have high plasticity and mobility, providing increased labor productivity. For one shift, an employee with a manual application method can perform up to 25 sq.m., and with a mechanized one - up to 50 sq.m plaster.
Gypsum plaster is ideal for leveling ceilings and other horizontal surfaces. Since this material is porous, it allows moisture vapor in it or the room to be absorbed unhindered, which creates natural ventilation of the finishing layer and building structures. Thus, in rooms with such finishes, a balanced microclimate is created.
Unlike cement coatings, gypsum plaster has a lower coefficient of sound and heat conductivity. This finishing material is most suitable for the mechanical application method. In combination with various primers, it is able to solve the problem of plastering concrete surfaces and those that have smooth bases, without the use of a reinforcing mesh. Gypsum plasters can also be used on some soft substrates. When using them, there is no risk of delamination.
Gypsum plaster of manual drawing is intended only for drawing by hand tools. Typically, this method of decoration is used in small rooms. There is another type of this finishing material - universal gypsum plaster. It can also be used for mechanized application using special aggregates on large surface areas.
There are many varieties of gypsum plaster from different manufacturers. Almost all of them are environmentally friendly. Before applying to the surface, dry mixtures are diluted with water. The solution is used within an hour. Its average consumption is 1 kg / sq.m. (with a layer of 1 mm). Dry gypsum mixtures are sold, as a rule, in paper bags of different weights.