Warm Plaster

Warm plaster is the new face of old building material. New, not yet well known to everyone. This is what we'll talk about today.

First of all, warm plaster, like its calcareous progenitor, is a mixture. But the mixture is based on cement mortar, for which pumice powder, perlite sand or expanded polystyrene granules are used. And here are some more types of fillers.

Expanded vermiculite is obtained by heat treatment of vermiculite rock. The result is a lightweight mineral aggregate with excellent antiseptic properties, suitable for both exterior and interior applications.

But sawdust plaster - for interior work. The filler is made of sawdust, but also cement, clay and paper. Such a composite kit provides very good thermal insulation, but requires two weeks of ventilation during the drying process. Otherwise, new plaster can be threatened by fungus and mold.

But the most common filler is based on expanded polystyrene granules. In addition to it, it also contains lime, cement and additional additives or aggregates. Such plaster can be effective both outdoors and indoors.

The list of scopes of such a coating is quite wide. First of all, finishing of facades, walls and ceilings in all cases when thermal and sound insulation is required. But warm plaster is also used when finishing the slopes of window and door openings, risers, and so on.

Plastering on a wall is a fairly straightforward process. First, the wall is prepared, that is, they remove dust and residues of coatings that were previously used, apply penetrating impregnations, strengthen in some places with reinforcement, but mainly with plaster mesh. Before starting the application, the surface is abundantly moistened with water.

The entire package of the mixture is placed in a container with a volume of at least fifty liters, diluted with water and mixed using a mixer. After preparation, the mixture should be applied to the wall no later than two hours. The consistency of the mixture must be such that it does not fall off the surface of the trowel when it is turned over.

Application of the mixture to the wall can be either manual or machine. The layer should not exceed twenty millimeters. The next layer can be applied no earlier than after a four-hour break. This is necessary to completely dry the layer laid earlier. A drop in temperature and a drop in humidity during autumn rains will increase the drying time.

Comparative characteristics of warm plaster, as well as mineral wool, foam and extruded foam, are given below.

Min. cotton wool Styrofoam Extr. foam prop. Warm. pieces. KT 0.041-0.044 0.033-0.037 0.028-0.032 0.063 PL 30, 40, 60 11-35 30-45 200-340 VdPg 70 1.5-3.5 0.1-0.4 70 GrGy NG (non-flammable) G1-G4 G1-G4 D1 ST from 20 from 5 from 20 layer 25 mm - 35

Where CT is the coefficient of thermal conductivity, W / m C; PL - density, kg / m3; VdPg - water absorption in percent by weight; GrGr - flammability group; St - the cost in USD for one square meter.

Warming with plaster, as can be seen from the table, is much heavier than other options. This must be taken into account when calculating the foundation. And one more important circumstance: the maximum layer of plaster is 50mm. Therefore, to obtain the required thermal insulation effect, a layer with a size of 50 to 100 millimeters is obtained from both sides of the wall - internally and externally.

The advantages of a solution based on warm plaster include the following:

• no wall alignment required;
• work is done very quickly; one plasterer per day can lay from one hundred and twenty to one hundred and eighty square meters of the layer;
• the plaster fits well (high adhesion) to any wall material without additional measures for surface preparation;
• applied without the use of reinforcing meshes, exceptions may be typical for particularly difficult places, cracks in the wall surface, corners of the outer or inner contour; this is important not only from the point of view of application technology, but also for high-quality thermal insulation, which is difficult in the case of metal reinforcement;
• the plaster is not susceptible to biological influences, rodents and insects do not start in it.

And the disadvantages are as follows:

• warm plaster is more expensive than the competitive options discussed above;
• it is necessary to complete the wall finishing - priming and painting or decorative plaster.

Thus, warm plaster is most beneficial when sealing joints, cracks, slopes of window and door openings, various irregularities of profiles in walls and ceilings. It is also effective for additional insulation of interior walls, if the exterior cannot be sufficiently insulated for various architectural reasons. Warm shukaturka is irreplaceable when insulating basements.