Plastering fireplace and stoves

Plastering fireplace and stoves Facing the fireplace and stoves with plaster - features of using the material

Plaster for stoves and fireplaces will be very different from those applied to wall surfaces and other structural elements of a building.

The mixture will have a special composition that is resistant to large temperature extremes.

You can even prepare it with your own hands, and if you have no experience, then ideally you should buy ready-made plaster (dry), which will be enough to knead in water before use. You will learn all the most important about facing the fireplace and stoves with plaster.

General information

Why it is necessary to plaster the fireplace outside

First of all, the exterior finish will give the structure a complete look.

When using standard red brick for masonry, a folded fireplace or stove does not look aesthetically pleasing. But beauty is not the only factor in the importance of plaster.

The need to plaster brick products (fireplace or stove) will be explained by two more important nuances:

  1. Plastering fireplace and stoves When burning brickwork, the stoves will be very hot from the fire, and a similar process will be typical for a fireplace. After the flame goes out, cooling will occur. Temperature changes will lead to the fact that bricks with small displacements in the process will crack at the seams.

    The solution will gradually spill out, and the smoke from the combustion chambers will enter the room. Plaster creates an airtight layer that prevents waste from filling the living room.

  2. Stoves in most private houses will be stacked on clay, and various insects love to settle in the material of natural origin in summer, when there is no need for heating. The plaster will act as a hygienic layer that can protect the room from pests. Plaster helps to keep the fireplace and stove neat.

    Without applied finishing, the clay solution will gradually spill out onto the floor, and then spread around the room like dust.

Now a little about the nuances of finishing.

Features of cladding stoves and fireplaces

Although the process is homogeneous, plastering the surface of walls in buildings will be very different from the actions that are taken for a conventional stove or fireplace. First of all, the feature will be the use of a special solution. The usual mixture based on cement and sand will not work here.

Please note that the outer surface of brickwork in a fireplace or a classic stove can be heated in some places to temperatures above +100 degrees.

Due to the strong overheating of the brickwork, temperature expansion will occur. Conventional cement plaster will crack and flake. The same will apply for standard clay.

So that the plastered surface can maintain its integrity for a long time, and a number of important requirements are presented to the solution for stoves and fireplaces that are heated with wood:

  • Even in hardened the form of plaster throughout the entire period of operation must maintain elasticity.

  • Thermal resistance will stand at the same position with elasticity, it turns out that the plaster is resistant to strong heat.
  • How long the decorative layer retains its aesthetic beauty will depend on its resistance to wear and tear. You can even make plaster yourself, but it will only partially meet the requirements. It is based on sand and clay, but there is no cement at all or it is in small quantities. Asbestos and lime can be used as additives.

Please note that asbestos is a dangerous substance for human health, and when heated it will release substances harmful to the human body.

There are several options for solutions, and the proportions for self-preparation are prescribed in the following table:

Material / solution Sand Clay Cement Lime Asbestos
Clay and cement 2 1 1 0.1
Clay and lime 2 1 1 0.1
Clay without additives 2.5 1 0.

2

Clay should be soaked for 24 hours to create a solution. The slurry with all the additives should be mixed with a mixer to prevent the formation of lumps. The optimal plaster will be considered to be thermally resistant for fireplaces and factory-made stoves. Decorating the fireplace with decorative plaster is important, but before using it, it will be enough to knead the solution with water, following the manufacturer's instructions. But even the highest quality plaster on its own cannot withstand large expansions of the warm type.

To prevent the decorative layer from crumbling from a brick stove or fireplace, it should be reinforced.

For this, two technologies are used:

  1. Special reinforcing fibers are added to the solution during kneading.
  2. Wire or mesh is pulled over the brickwork.

Which option is better is difficult to answer. Everything will depend on the complexity of the forms of the structure.

The stove is usually made of a rectangular classical shape with smooth walls. It will be easier to attach the mesh here, and fireplaces often have intricate curved wall shapes. It is difficult to attach the mesh, and it will be much easier to stretch the wire or apply an additive to the reinforcing fiber solution.

Process

Tools and materials

A float, trowel and trowel will not be enough for plastering work. This requires an extended set of tools.

You will need two hammers - a cam hammer and a plaster hammer.The first should be driven in special plaster nails, and the second can be hit with a chisel and the rest of the devices for breaking bricks. Cutting the reinforcing mesh requires metal scissors, and additionally requires a chisel, plumb bob, metal brush, building level and tape measure. From plaster-type accessories, prepare a trowel, a grater, a trowel, spatulas of different sizes, a trowel or a trowel.

Making a mixture for plastering

When using factory-made plaster with the creation of a solution, there should be no questions.

The manufacturer will always provide detailed instructions on the packaging. A simple dry mixture should be simply diluted with water and kneaded with a construction mixer. When someone independently makes heat-resistant plaster for fireplaces and stoves, then first of all, each component in its composition should be sifted through a sieve to remove solid impurities. The second important condition will be the correct selection of the main binder and the calculation of the ratios. It differs in its fat content, and the higher the indicator, the more sand should be added.

Good advice! Experienced oven installers add a little salt to the clay solution, which will prevent insects from settling.

Before kneading, the clay should be moistened for a day. It is better if the process lasts two days. So, before finishing the stove with plaster, all hard lumps will have time to dissolve. The sand should be added sifted and dry, and this important condition helps to maintain the correct proportions.

Lime from additives is chosen much more often than other materials. the substance is a shaped plasticizer, and with lime, the viscosity of the solution increases, as well as adhesion to bricks. If cement was also chosen from the additives, then it is worth using the M-400 brand. This plaster will begin to harden on the stove / fireplace after 4 hours. Full setting will occur after 12 hours, and the plaster will gain final strength after a month.

Plastering the fireplace with your own hands - instruction

When all the work with the solution is over, it's time to move on to the main procedure. But you cannot immediately plaster the stove or fireplace. To begin with, you need to carry out preparation activities, on which the quality of the finish will depend. Surface preparation before plastering consists in preparing the surface of the brickwork. If the stove or fireplace is not new, already in use, then old plaster, paint or other type of finish will remain on the surface of the walls.

It should be cleaned all over, as well as to eliminate irregularities and repair cracks. the seams between the bricks need to be slightly deepened with a chisel or trowel.

After cleaning the walls of a fireplace or a simple stove, the rule is to check the evenness. Large differences will require a thick plaster coat. To prevent it from cracking, you will need to purchase a reinforcing mesh.

It should be fixed with nails or dowels, as well as drilling holes for them. Wide washers are put on them, and they are better able to fix the net. But at the same time, it should not fit snugly against the wall of the stoves or the chimney plane. To do this, under the mesh should be lined with any materials with a thickness of 0. 3 cm.

The final stage of preparation requires surface treatment of the deep penetration primer compositions.

Note that the gap between the reinforced mesh and the brickwork is required to completely immerse the mesh in the mortar. From this, the plaster will become much stronger.

Application of the composition

Plastering fireplace and stoves Before plastering, carry out two actions. First, the surface of stoves or flat fireplaces should be moistened with water.

Without moisture, the plaster will not adhere well, and the solutions are also prepared in such a portion, which is enough for a single use. Do not leave the mixed solution the next day. The plastering process consists of several stages. First of all, a liquid solution should be thrown onto the surface of the walls of the stoves or the plane of the fireplace. The process will be aimed at filling all types of voids, and the thickness of the first layer should not be more than 0.

5 cm. If the surface of the fireplace or stove is covered with a grid, then the grout is thrown with a trowel and a spatula. The throws should be sharp so that the plaster sticks to the brickwork and also fills in the gaps in the joints. In the absence of a reinforcing mesh, there is no need for this technology. The solution should be applied to the plane with a wide trowel.

Stretching is carried out from the bottom, and then begins to move upward. The excess in thickness should be cut off, and more solution is added in the depressions. After applying the first coat, wait for it to set. For further work, prepare a thicker solution, and the second layer of plaster is considered the main one. It is ideal for leveling the walls of the fireplace / stove.

The second layer will likewise be given a setting time. For the final finishing, an extremely high-quality plaster without lumps is prepared. The mortar should be applied with a wide spatula or even a trowel, and this way a perfectly flat plane is achieved.

Facing the fireplace with plaster when applying the third layer, wait until it dries, but not completely, and then start grouting. The work should be done with a float, moving it in sharp circular movements along the plastered plane.

The bumps are cut off with the side of the instrument. If cavities are identified, mortar should be added, and the force of pressing on the grater will depend on the relief. On the depressions, the tool is pressed less strongly, and in the area of ​​the bulges, the pressure should be stronger. Please note that the grout should not be done dry, the grater should be constantly moistened with water.

Decorating

The applied material is considered a rough finishing layer of the stove or fireplace.

Now it is required to decorate, and most often decorative plaster is used for fireplaces and stoves, which contains stone-type chips or other fillers. Apply a decorative layer to the hardened surface of the base. The plaster will be crusty by that time, but not completely dry, and you can press it with your finger to check. A small dent will appear from great effort. The method of applying the decorative layer will depend on the selected composition and is described in the manufacturer's instructions.

If desired, the stove walls or fireplace surfaces are painted. Special paint is used, water-based. If the paint material contains chemicals, when heated, they will begin to release into the atmosphere. In the video, you will see the decoration with plaster.

Conclusion

The agent for fireplaces and stoves after application must stand for at least a month.

You cannot immediately light a fire, and from a sharp heating, the solution will begin to dry out, without gaining the required degree of strength. From this, it will quickly become covered with cracks and crumble.

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