What is plaster of paris?

What is plaster of paris? If we want to achieve the effect of perfectly even walls, finishing coats seem to be a great solution. They will prove useful both during the house construction process and later, when we decide to carry out a major renovation. What exactly is plaster of paris? What types of plaster can be distinguished? What substrate do we most often polish? What is the use of finishing coat? The answers to these questions can be found in the article below, which we cordially invite all interested readers to read. 

What exactly is plaster of paris?

You do not need to be a construction specialist to be able to say that plaster of paris is actually a very popular building material that allows you to finish the walls in an effective way. Until recently, cement plaster with an admixture of lime was used, however, this solution was associated with the fact that a rough texture was created, which turned out not to be attractive to everyone. Additionally, even high-quality plaster cracked after several years, which distorted the aesthetics of the interior. The putty is a modern replacement that is able to create a flawlessly even surface, which is why it has gained so many fans. From a chemical point of view, plaster is simply a mixture, the basic ingredient of which is usually gypsum – it is a binding and filling element. Of course, there are also other ingredients in a given preparation, such as chalk or dolomite, as well as other substances that are designed to delay the setting of gypsum, which enables comfortable carrying out of all finishing works. It is worth realizing that on the market there are ready-made putty compounds in the form of a paste, as well as dry mixes. The decision in this case depends on individual preferences, as well as on the budget we have.What types of plaster can be distinguished?

In the construction market, we can distinguish several types of finishing coat, which at first glance differ only in packaging. In practice, it looks a bit different. The most popular are gypsum coats, which are made of ground natural or synthetic gypsum. The former are distinguished by the fact that they are much whiter, but the setting time is longer. The synthetic ones are very resistant to any mechanical damage.

There are also cement coats. It is difficult to create a white and smooth surface with their use, but compared to other materials, this one is extremely resistant to mechanical damage. Additionally, we can use them in rooms where the air humidity is slightly higher. The big plus is that there is no need to sand the walls, so the house will not be dusty.

The newest finish coats are the polymer ones. They can be dry, to be mixed with water, or ready-made – then they are packed in special buckets. Polymer coatings are highly flexible. Consequently, they can be used even on difficult surfaces that are subject to slight structural movements – the probability of cracking is low. What can we smooth? – the most common surfaces.

Plasters are by far the most common base for plaster. They have a protective function and at the same time level the walls, unfortunately their texture is granular and sand, hence the additional use of putty. It is worth mentioning that it is possible to smooth all types of interior plaster – lime, cement, gypsum, polymer and others. As a curiosity, it is worth mentioning that the ready-made plaster can be used on most typical construction substrates. Regardless of whether they are concrete blocks, concrete, aerated concrete, plasterboards or something else. It is also possible to smooth old paint coatings using emulsion or oil paints, and even wallpaper.

What is the use of finishing coat?

First of all, we must be aware that each type of finishing coat has different properties and applications. In the case of living and sleeping rooms, the most common solution is gypsum plaster. There is nothing strange about it, because the price is fully satisfactory and the end result is very aesthetic. In addition, it is a material that is suitable for virtually any substrate, even on raw concrete. In some rooms, the air humidity is slightly higher, therefore, special-purpose coatings should be used.

Then the lime mixture seems to be the bull’s eye – it is an excellent base for latex / acrylic paint. However, do not use this material if you are considering tiles, because the limestone coating will not cope with the excessive weight.What kind of putty should be used outside the building? Let’s consider lime or cement plaster. In practice, both mixtures cope perfectly with changing weather conditions. We must not forget that calcium-based preparations are slightly less flexible.

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