Types of plasters for finishing facades
The most common is the finishing of facades with plaster of the following types: facade( acrylic, silicone), decorative and cement-sand. Let us consider each of them in detail.
Silicone facade plasters are a polymer coating and are made of silicone resins. The main advantages: high resistance to ultraviolet light, moisture resistance, resistance to temperature drop, hydrophobicity, as well as a long service life. The finishing of the facade of the house with silicone plaster is required when a durable coating is necessary. Of the shortcomings can be identified only one: its high cost.
Acrylic facade plasters are one of the most affordable and cheapest ways of finishing. Facing the facades with acrylic plaster is suitable for insulation of the facade with expanded polystyrene, as it does not allow moisture to pass through. In addition, the great advantage of this plaster is its high elasticity. Therefore, when there are temperature differences on the surface, all kinds of damage and cracks do not appear. The main drawbacks are a strong susceptibility to contamination and poor vapor permeability.
Cement-sand plasters are made of cement, sand and various chemical additives. Finishing facades with cement-sand plaster is suitable in cases where the surface is exposed to frequent changes in temperature. And also in conditions of low and high temperatures and at high humidity.
Decorative plasters are more intended for the implementation of various design ideas. With their help you can create relief and smooth surfaces of all kinds of shades. Also, decorative plaster can mimic other, more expensive types of finishes. This effect is achieved due to the fact that it often includes pigments, quartz sand, stone crumbs of various sizes, excavations from rocks and other components.
Facade plastering technology
- The work is carried out at relative humidity of air no more than 70 percent and at a surface temperature of + 5 ° C to + 30 ° C.
- Before the beginning of the plastering work, it is necessary to prepare the surface. To do this, remove the old layer of plaster, paint or any other coating. The surface is completely cleaned of dirt, dust, bituminous and grease stains.
- If the wall consists of stone, brick or blocks, then you should clean the seams to a depth of about 1 centimeter. Further on the facade are made expansion joints. They are necessary for better adhesion of the mixture to the surface.
- The next step is to prepare a mixture of plaster. The recipe is always written on the package. If the mixture is too thick, you can add some more water.
- The plastering of the walls is carried out by spraying. This is done as follows. On the surface you need to throw with force and sharpness exactly the amount of mixture that is needed there. The operation requires a certain skill. However, over time, it is easily purchased.
- At the last stage, the grouting is done. However, it is worthwhile to carry out the process when the plaster has dried out a little, but has not yet hardened completely. It is advisable to do grout after several hours after smoothing the plaster.
Recommendations for finishing the facade of the house with plastering
- These works are not carried out on newly erected buildings, since later there may be cracks in the shrinkage.
- The thickness of one layer should not exceed 2 centimeters.
- Do not apply the mixture containing gypsum directly to concrete walls. Since in this case the plaster can later fall off or swell. It is necessary to first apply a mixture of lime plaster with a total thickness of about 5 mm.