Building plastering principles
Plastering or whitewashing the building is one of the important steps of joinery. Simple plastering is one of the steps of most of the construction projects, which is used for both indoor and outdoor spaces.
According to building news, plastering is one of the primary works in the interior design of the building. In order to be able to do any decorative work on the walls and roof of the house and building, these surfaces must be plastered.
How is building plaster?
Gypster required for construction is obtained after baking and grinding gypsum stone, it should be mentioned that gypsum is one of the most important and practical materials in the construction industry, which is placed in the fifth row of the periodic table. If you touch this material, you will notice its excessive softness. In general, gypsum is a very soft mineral. It is recognized by the formula CaSo4, 2H2O. It is interesting to know that gypsum after extraction from The lime mines will be placed in special furnaces, which will heat them up to 180 degrees Celsius in order to gradually lose more than half of their water of crystallization molecules, and eventually become one of the most important materials. be used in the construction industry.
What is a building plastering?
Plastering is an action that takes place in building construction. Actually, after completing the brickwork of the walls and also completing the roof, the builders go to plastering. In fact, covering the walls with plaster prepares the building for habitation.
Important Practical Tips on How to Plaster
* Gypsum has two main characteristics: fastness and increase in volume when it hardens. These characteristics require special solutions for working with plaster.
* Plaster is not resistant to water and moisture and in this sense it works very poorly. Therefore, these materials should not be used in wet areas.
* Gypsum is lighter than other ceramic building materials and this is considered an advantage.
* Plaster quickly reacts with water, crystallizes and hardens. Due to the fact that its setting speed is very high, working with it requires a lot of precision and it is necessary to prepare the appropriate amount of plaster mortar.
* To slow down the plaster, it can be done by kneading a lot and increasing the amount of water. This mortar is called dead plaster and it is used for the final coating in whitewashing the walls. (Gypsum powder should be sprinkled on water so that all the particles of gypsum are in the vicinity of water.)
* It should be kept in mind that when working with the trowel, it must be placed diagonally to the wall.
* Plaster increases in volume by one percent when it is set, so it does not leave any holes and creates a smooth and hygienic surface.
* When using plaster, it should be kept in mind that plaster sulfates metals, so metals should not be in direct contact with plaster.
* It should be noted that the strength of plaster depends on the amount of water in it and the temperature of its curing time.
* The presence of gypsum in the soil of the project site (about more than four percent) causes major problems in construction and reduces the useful life of the structure.
* Plastering plaster on the work surface in the traditional way involves a lot of waste. For this purpose, polymer plaster can be used, which, in addition to having many advantages, also prevents the wastage of plaster.
* If soil is used in mortar, attention should be paid to the proportion of plaster and soil. This ratio can be from half to twice that of gypsum. This amount depends on the strength of the plaster and the fastness of the plaster, the faster the plaster is, the more soil it needs.
* It should be kept in mind that with the amount of 40 kg of plaster (approximate weight of each bag), you can plaster about 2.8 square meters of the area of a wall with plaster and soil, and about 12 square meters for joinery and final coating.
* For the preparation of dead plaster, it should be noted that soft and very fine plaster must be used and mixing should continue for 10 to 15 minutes.
* In plastering interior spaces, the best type of plaster and tools should be used to get the best result.
Benefits of plastering
The advantages of plastering include the reasonable price, the whiteness of the color, which is very suitable for decoration and other compositions, the malleability of plaster, the availability of materials, the appropriate tensile and compressive strength, and the little time it takes to implement projects. plastering is needed, he pointed out. In addition to these cases, when the plaster is drying, it increases in volume, which covers the cracks and holes, and for cases where you want to prevent the penetration of insects through small holes, plastering Simple is very suitable. One of the very good properties of plaster is its resistance to fire. Plaster structures last two to three hours against fire. In addition to all these things, 60 to 70 percent, a plastered room will be sound insulated compared to before.
Plaster
Spray plaster is obtained from the combination of building plaster, polymer additives, hydrated lime and perlite and is applied using a plastering machine. Compared to the traditional method, this method has advantages such as higher speed and low waste of materials. Spraying plaster is usually used in large plastering projects. In addition, it is also a good sound and thermal insulation and works better against wear and moisture than ordinary plaster. Among its other advantages, we can mention its high strength and adhesion, high setting time, and the possibility of surface finishing to reduce cracking and create a uniform surface due to full penetration in all pores. For plastering with spray plaster, first the entire surface of the ingot is taken Then, the mixture of plaster and water is sprayed on the desired surface using a special device and with the help of air pressure. At the end, the surface is smoothed by sandblasting and surface polishing is done by adding a little moisture and troweling with a sponge and metal trowel.
