Having decided to repair, in any case, you will encounter the need for high-quality decoration of your home. In the overwhelming majority of cases, the role of finishing material is ordinary plaster. It is simple and cheap, and with proper operation, the result will be simply magnificent. However, even an experienced master from time to time may encounter certain difficulties in his work. This is especially true for walls made of foam block: mortar for plastering walls of this material has its own characteristics.
Firstly, the surface of this kind of wall should be checked for various chips and other mechanical defects. After thorough cleaning of the surface, priming can be performed. Evenly and gently distributing the composition on the surface of the wall, wait until it dries, and at this time dilute the
plaster mixture. But do not hope for easy work, since the foam concrete block is a very moody material in this regard. And the composition of the mortar for wall plastering should be compiled in accordance with all its requirements.
Take brick, for example. A brick wall absorbs moisture without problems, and does it evenly. The result is a strong bond between the wall material and the plaster itself. And what is the behavior of the foam block in this case? It absorbs moisture much better than brick, but here it is not in a hurry to give it away. As a result, there is no question of any uniform distribution of moisture. That is why wall plastering with lime mortar in the case of a foam block is completely unacceptable! Lime absorbs moisture well, and after drying it simply falls off.
If there is no primer mixture at hand, you can spray the wall with a plastering mortar. Reliability and efficiency of this method have been tested for decades. The material can be applied only after the layer of the mortar dries slightly. Thanks to such a simple reception, it is possible to provide excellent adhesion of the finishing composition to the foam block wall. This effect is due to the fact that moisture from the primer or its substitute is perfectly distributed on the surface of the wall. It is possible to dilute mortar for wall plaster with conventional mixtures for surface pretreatment.
Let's go back to a simple primer mix. Are there any differences in the use of primer and mortar? There are, and quite substantial. First of all, acrylic primer is not suitable. Its disadvantage is that during its hardening it strongly dries the surrounding surfaces. It is clear that this is completely unsuitable for the capricious foam block.
If you put acrylic plaster on the foam block , then it will not last long. Due to the need to maintain moisture during drying of the surface, the temperature should not exceed +27 degrees Celsius. In addition, such a solution for wall plastering is best dried in conditions of slightly increased humidity, allocating more time for this.
In a word, the simplest method using plaster mortar should be recognized justified from an economic point of view. In general, this is all the wisdom on the refinement of the walls of the foam block exhausted. If you approach the matter wisely, then there is nothing complicated in this, and the mortar for plastering the walls will last for years.