Surface preparation
To begin with, a surface is prepared - cleared of dirt and dust, bituminous and grease stains. It is mandatory to cut off the protrusions of walls and concrete streaks, as well as the influx of concrete when dressing seeds and husks. If the projecting places or surface swings are too large, then the base must be covered with a metal mesh.
Usually used wire mesh "wire rod" or wire woven mesh. One way or another, fasten it with tension on the dowels and wire. At the same time, the grid should have cells no more than 10x10 mm, and the diameter of each wire rod should be about 6-10 mm.
Materials and tools
Like any construction process, plaster for concrete is carried out with the help of certain tools and materials. The main tools include: rule, level, wooden slats, screws and a mixture of plaster, which can have a different composition. For example, cement-lime or polymer-cement plastic mixtures are often used.
These or other formulations may be on a synthetic basis or on the basis of a dry mixture. Typically, they add organic plasticizers, which are designed to increase the mobility of the solution. In rooms with a humidity of up to 60%, two types of plasters are used: lime plasters( when plastering walls and partitions) and lime mortar with portland cement or other astringent components( when exterior decoration of concrete walls and ceilings is done).
Concrete wall plasters
A mortar is prepared for plastering walls according to the recipe specified on the package. The method of applying the solution is the same as for the finishing of brick walls( method "spraying" ).The only difference is that on a concrete surface the spraying must be leveled. The thickness of the plaster layer should be no more than 5 mm. However, just before the procedure itself, a number of other works are performed.
As already mentioned, if the surface is uneven, then tighten the metal mesh. If the walls are level, then begin to mount the slats, the distance between which should be no more than 1 meter. They are designed to divide the wall into sections and simplify the process of plastering walls. Next, the wall is moistened with water( for wet plaster) or lightly moistened( for synthetic).Then proceed directly to the "spray".
Apply the mortar from the corners, and then go to the sections. The rule is carried out along the slats in the direction from top to bottom while eliminating the excess solution. If somewhere on the contrary the solution is not enough, then it is added. So do with all the sections on the wall. After the composition should grasp and harden. Neatly remove the slats. The remaining grooves are also filled with plaster mortar. At the final stage, the grouting and smoothing is done.
Note! In addition to finishing the concrete walls with plaster for leveling the base, can also be used as "decorative plaster for concrete". And it is radically different from the first. Its main function is not the leveling of the walls, but the creation of a decorative surface that imitates the texture and color of concrete. Such compounds are often used to create a "techno" design or when decorating a veranda, basement, ancillary facilities. Plaster for concrete has other properties and performance characteristics. Therefore, be careful when buying and do not confuse it with the basic stucco mixture.