How and what to plaster a brick oven

The stove appeared in a person's life earlier than the hut. At the beginning of its existence, it looked like a hearth with a kettle hung over it. The constant development and improvement of the hearth has turned it into a work of art.

Furnace evolution over time

The modern stove no longer has anything to do with a campfire. The first stoves, like the ancient huts, were made of clay. Over time, a brick oven became the most important attribute of each hut. In the five-walled huts, the stove was erected in such a way as to heat both rooms. It was installed in a wall opening, positioned so that one side of the stove was pushed towards the bedroom. The main part of it was in the light room, where the whole family gathered. Now in homes this method of installing a stove is often used. In the highlands of the Carpathians, you can find houses with a stove that heats 4 rooms.

The latest technologies make it possible to obtain bricks for ovens with a fairly acceptable appearance. And yet, most housewives want to see their stove plastered. The stucco stove looks aesthetically pleasing and attractive. In the villages, it is hand-painted with folk ornaments. In order for a painted stove to please the eye for a long time, it must be properly plastered. Then the surface of the furnace will remain intact for a long time, without cracks, chips and other errors.

How to plaster the oven

Since ancient times, a natural material called chamotte clay has been used to plaster the stove. In a simple way - fireclay. Although fireclay initially has special properties, if it is improperly prepared for coating the furnace, the results of work may not meet expectations. Before preparing the solution, the clay must be soaked for at least 3 days. While the clay is soaking, it should not be pierced or stirred. The clay flooded with water is left alone until it is completely soaked.

To determine if the clay is soaked, you need to take a pinch of the resulting gruel and rub it between your fingers. If it crawls under the fingers, the lumps are easy to press, then the clay is ready. It's time to prepare a solution from it.

It can be prepared in several ways. The folk composition of the solution is clay, sand and water. It should be borne in mind that the amount of sand in the solution is directly proportional to the fat content of the clay. With oily clay, three, or even all four, measures of sand are added to one measure of chamotte.

Another mixture consists of one measure of clay, the same amount of lime and two measures of sand. It is called a lime mixture. Another composition for plastering a furnace is called cement clay sand. It contains the same amount of cement and twice as much sand for one measure of clay.

There is another solution in which clay is not present - lime-gypsum. It includes two measures of lime, one measure of gypsum and the same amount of sand.

The table shows the proportions of the ratio of the constituent solutions for the plaster of the oven.

Furnace preparation and plastering tips

It must be remembered that before plastering the stove it should be heated several times. When heating the oven for the first time, do not bring it to a very hot state. The first heating should be gentle. The next time you need to warm up the stove more, then even more. This is necessary so that the new stove shrinks and at the same time does not crack along the masonry.

Of course, you can always buy a ready-made composition in the store, but it will be more expensive than preparing it yourself.

Binder asbestos fiber is added to the soaked clay solution. Sometimes straw or burlap.In this case, care must be taken that the oven does not overheat. Chopped fiberglass can be added. Sometimes salt is added to the solution as a binder, but this method has not yet been fully understood.

The addition of asbestos to the solution must also be treated with caution. Asbestos, of course, has non-combustible properties, but its low thermal conductivity can significantly reduce the efficiency of the furnace and, as a result, lead to excessive consumption of fuel.

The lime added to the solution is carefully selected, extinguished in the pit for at least a month. The longer the slaking process lasted, the better and more elastic lime is.

When using plaster, it should be remembered that it hardens quickly. Its setting occurs already after 5 minutes to half an hour, which must be taken into account when plastering. You can use white plaster, which remains elastic all the time while it is in motion. By constantly stirring the solution, it is not allowed to harden. The moment of plaster hardening is receding, and there is no need to rush during the work.

Sometimes the oven is reinforced with a mesh. However, this option is questionable. Since the expansion coefficients when plaster and metal are heated are different, there is a risk that the plaster will peel off from the stove and hang on the reinforcement, forming an air gap that prevents heat exchange between the stove and the plaster, and then with the air in the room.

Before plastering, prepare all the necessary tools: spatulas, brushes, rules, trowels, floats - everything that is more convenient for you to work with. When the plaster dries a little, it should be covered with lime milk. This will prevent the plaster layer from drying out quickly and causing cracks.

The plastered oven must be left to dry. The room should be free of drafts and heaters. Allow your creation to dry naturally and get a positive result.

Let the stove please the eye and create coziness and warmth in your home on winter evenings for many years.
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