How to plaster the stove so that it does not crack? Heat-resistant plaster for furnaces and fireplaces: tools, technology

Plastering the oven is not such a simple task as it might seem at first glance. Incorrectly applied finish due to constant temperature changes necessarily cracked or completely disappears pieces. In order to plaster the stove correctly, it is first of all necessary to mix a suitable solution. Actually, the very procedure of finishing should be done with observance of a certain technology. How to plaster the stove so that it does not crack - we'll talk about this later.

What is it for

Finishing stoves and fireplaces can be made using a variety of materials: tiles, artificial stone, heat-resistant plasterboard, etc. However, it is plaster has always been considered optimal in terms of price / quality ratio of the material. Looks like this trim very carefully. In addition, in the case of accurate compliance with the technology of application and it can last a very long time. The stove for the oven allows:

• Align the surface of the masonry and make it beautiful;

• Increase thermal inertia.

In addition, the plaster also closes the seams in the masonry. And this, in turn, prevents the accumulation of household dust in them.

How to plaster the oven, so as not to crack: a traditional solution

Most often for finishing fireplaces and stoves is used not cement-sand mixture, but clay. This material is able to maintain its properties at temperatures above 100 ° C. Like cement, clay for finishing furnaces is mixed with sand. The latter is pre-screened carefully through a fine grate. The amount of sand necessary for the preparation of a quality mixture depends primarily on the fat content of the clay. The higher this index, the more plastic the mixture. Therefore, the more sand should be added to it. With its lack, the mixture will dry after drying.

Typically, the ratio of fatty clay and sand in the stucco solution for furnaces is 1: 3 or 1: 4. To strengthen the composition in it, you need to add straw or hemp. Qualitative stucco clay furnace can be made and if the solution will be mixed a little fiberglass (0.2%). In any case, the mixture should be brewed in such a way that it is as homogeneous as possible. The clay itself must first be soaked for at least 3 days.

Other types of solutions

Answering the question about how to properly plaster the stove so that it does not crack, it is worth considering the use of other options for heat-resistant mixtures. The method of preparation of a solution considered above is far from the only one. There are many recipes for such plasters. If desired, you can make a heat-resistant solution, for example, mixing:

• Clay, sand and cement in proportions of 1: 2: 1 with the addition of 1% asbestos;

• Gypsum, lime and sand in a ratio of 1: 2: 1 plus 2% of fiberglass;

• Clay, sand and lime in a ratio of 1: 2: 1 with the addition of 2% asbestos.

Purchased heat-resistant mixtures

Also for finishing can be used and finished plaster for the oven. There are many varieties of such mixtures. But the most popular are Pechnik and Terracott. Advantage of such plasters in comparison with cooked hands is a high degree of heat resistance. "Pechnik" and "Terracotta" are able to withstand temperatures up to 200 degrees.

Whichever mixture is used for the plastering of the stove, whether it is purchased or homemade, there is no need to cook a large amount of it immediately. The volume of a single serving should not exceed 8-10 liters. In any case, it is necessary to develop a solution for a maximum of 2-2.5 hours.

Fiberglass mesh plaster as additional reinforcement

To ensure that the solution on the furnace is subsequently kept as firmly as possible, it is not enough to use reinforcing additives in the form of straw or pakli. When finishing, use a special fiberglass mesh. This material can now be purchased in almost any building supermarket.

It is worth a mesh of glass fabric plaster is very inexpensive - about 30 rubles per 1 m ² . Finishing while using it on the stove lasts much longer. Instead of fiberglass for reinforcing the solution, you can take a metal mesh.

Preparatory activities

Before proceeding to the actual plastering of the oven, its surface should be thoroughly cleaned. Do not apply a solution to a smoky or dusty brick in any case. Otherwise, it will not last long after. After cleaning, the stove should be heated. But too much firewood or coal in the furnace while you do not need to pawn. Plaster is applied for stoves and fireplaces only on a warm surface.

It is impossible to work out the stove immediately after finishing its masonry. You need to wait at least two weeks. Masonry must be hardened before plastering.

Before starting to apply the mortar, among other things, you should choose the seams between the bricks at 10 mm. In this case, the heat-resistant mixture for stucco furnaces will stay on the surface better. Also in the clutch you need to drive in small carnations, which in the future will be stretched reinforcing mesh.

What tools will be needed?

In addition, before proceeding to plastering the oven, among other things, you should prepare:

• Solution tank;

• Trowel;

• Emery for grouting;

• Broom or brush;

• bucket with water;

• construction level.

Technology of plastering

Well, the preparatory measures have been completed, and the tools have been prepared. Now let's see how to plaster the stove. In order not to crack the applied mixture and do not fall off, it is necessary to carry out this work correctly. Plastering is usually carried out in several stages. Preliminary, the surface of the oven is wetted with clean warm water. You can moisten it with a conventional broom. Then:

• Spraying the solution;

• padding;

• Covering.

Spray the mixture

The first plaster layer is necessary in order to level the surface of the furnace. Nabryzg, as already can be judged by the name, is performed with the help of the same broom or brush. The thickness of this layer should eventually be 3-5 mm. After the spray has been leveled, on the surface of the oven it is necessary to stretch the pre-cut fiberglass mesh, slightly pressing it into the solution.

Padding

The second layer of plaster can be applied after drying the first. Its thickness should also be 3-5 mm. Priming layer should be carefully aligned and wiped. Nabryzg while, as it will dry out on a hot stove quickly, you need to periodically moisturize. A solution for the primer layer should be used slightly more liquid than for the first one.

Cover

The last layer of plaster is necessary in order to level the surface of the stove completely. Primer before applying it should be quite abundantly moisturized. The solution in this case should be used even less dense than for the first two layers. The mixture must fill absolutely all the cracks and irregularities that remain on the surface. The thickness of the covering layer can be from 2 to 5 mm. The stove can not be leveled in planes in planes. In the end, the total thickness of the finishing layer should not be more than 1-1.5 cm. Laying out brick furnaces for the house with their own hands, this should be borne in mind. The walls in the performance of this work should be tried to initially do as smooth as possible.

How to properly plaster corners

To make the stove look neat, carefully leveling the surface of the plaster is not enough. In addition, it will be necessary to decorate the corners nicely. In order to make them as neat as possible, you should use leveling rails. After drying the solution, they should be simply removed. Instead of racks, you can also take an aluminum profile, designed for fixing drywall. It is fixed to the oven with a mortar and flush flush. Of course, both the slats and the profile should be displayed using the building level.

Oven staining

So, now you know how to plaster the stove so that it does not crack. Of course, after the applied solution dries, its surface must also be whitened. Use for this purpose is best milk-chalk mixture. This whitewater tolerates temperature changes well and is not spoiled. In order to cook it, you just mix 1 kg of crushed chalk with 2 liters of milk. You can paint the oven and ordinary lime. This finish also will not deteriorate due to the high temperature. In order for lime to stay on a hot surface, it is possible to add a little salt (35 g per 1 kg).

Do not paint stoves and fireplaces using oil paint. The linseed oil in the LMC at high temperatures will evaporate and an unpleasant smell will appear in the room.

Instead of concluding

Today brick ovens for the house with their own hands erect many. The description of the technology of assembling such structures, as well as their drawings and diagrams, can easily be found in the specialized literature. However, putting the stove or fireplace right is just half the battle. Plaster on the surface of the heating equipment of this variety also needs to be applied, adhering to the laid technology. Otherwise, the furnace or fireplace will not perform its functions effectively. And even in the interior of a modest country house harmoniously they will fit hardly.