Reinforcement of walls with mesh for plaster. Plastering on a mesh: why reinforcement is needed and how to do it correctly

Facade finishing is one of the most important construction operations. The coating of external walls is exposed to precipitation, cyclic freezing/freezing and exposure to harsh ultraviolet rays. Such difficult operating conditions place increased demands on the quality of finishing. Eliminating defects on façade walls is very expensive and time consuming. You will have to install scaffolding, wait for good weather, and remove construction debris. To eliminate the occurrence of unpleasant situations, you need to take all measures to prevent them.

Facade reinforcing mesh

What kind of technology

Reinforcement is an integral building material. Reinforcement strengthens structures and also extends their service life. When finishing structures, they often encounter defects that are difficult to hide. The only way out is to apply a thick layer of plaster. To ensure adhesion and strength of the coating, reinforcement is used.

It is recommended to use in cases where the coating layer exceeds 2 centimeters. Different materials are used for reinforcement. It is attached using the same technology. All that remains is to decide when it is better to use mesh for plastering walls, as well as which material to choose.

Why and when is it used?

Plaster mesh for interior work is used to solve various problems:

Elimination of irregularities. After building a house, we are often faced with uneven structures. This is especially true when construction work is carried out by inexperienced specialists. To remove defects, plastering is carried out. If the layer is large, then you cannot do without reinforcement. Otherwise, the plaster will swell and peel off. The use of reinforcement will increase the strength of the coating.
Increased adhesion to the structure. Compliance with all rules and regulations allows you to build structures that are even. Reinforcement with mesh for walls will ensure reliable adhesion of the cement-sand mortar.
Repairing cracks. Plaster mesh allows you to eliminate cracks in the structure. The technology eliminates the emergence of new defects that negatively affect the strength and integrity of the coating.

Reinforcement with mesh for plastering walls is an integral process in creating a durable finish that will last for years.

Features of choice

To make the right choice among such a variety of materials, you should initially proceed from the type of work that is supposed to be performed. Therefore, it is necessary to focus on the thickness of the plaster coating:

if it does not exceed 20 mm, in this case a mesh for plastering work is not required at all;
for coating thickness up to 30 mm, it is recommended to use fiberglass mesh;
If it is necessary to apply a coating 50 mm thick, it is recommended to replace plastering with another type of finishing. For example, on a ceiling that has significant defects, it is more advisable to install a suspended or tension structure.

In order to obtain a high-quality finish after applying the solution, you must adhere to certain rules during the work process. The main aspects include:

compliance with the required proportions;
ensuring the required level of humidity and temperature in the room.

In the absence of these conditions, the plaster coating will turn out to be of poor quality. The use of a mesh is a prerequisite when working with walls that have significant defects, as well as with clay surfaces. Because in this case it is necessary to apply a thick layer of plaster composition. The finishing that was done using this mesh retains its performance characteristics longer. This product is also necessary when reinforcing the surface of walls before wallpapering or painting.

Advantages and disadvantages

The advantages of the mesh include:

light weight, which allows it to be used on any structure, including light interior partitions;
ease of installation - different elements are used for mounting on the wall;
affordable price - depends on the material, as well as the manufacturer;
easy processing - easy to cut into pieces, which simplifies finishing work;
Convenient packaging - available in rolls, which simplifies finishing;
withstands significant weight of cement-sand mortar.

Each type has operational characteristics. Plastic does not rust, which prevents the formation of red spots on the finish. Metal cells are highly durable. Often used for finishing facades and structures with a large area.

The features also concern the weaknesses of the material. Metal mesh is susceptible to corrosion. You need to work with them carefully. Do not leave it outdoors for long periods of time.

Polymer materials are characterized by low strength. It is not recommended to use for applying a thick layer of plaster.

Types of material

Experts distinguish several types of material, each of which differs in performance characteristics, intended purpose and cost. Let's take a closer look at each variety:

Metal plaster mesh is used primarily for interior finishing work. The product is manufactured with cells of different sizes based on cold-rolled or stainless steel.
Universal - these nets are made on the basis of polyurethane. In turn, they are divided into three groups depending on the cell parameters (small, medium, large).
Masonry mesh – made of polymer material. The cells are small in size - 5x5 mm. This type is designed for working with a brick base.
Steel mesh - made of steel rods that are soldered at the nodes. The product may have different cell sizes.
Fiberglass mesh. To make this product, specially processed glass fibers are used, which are obtained by passing molten glass through small holes. The size of each cell is 5x5 mm. This type of mesh is quite popular due to its high strength and resistance to various chemicals and temperature changes.
Galvanized plaster mesh is a type of material that is produced by soldering galvanized rods into units. Suitable for all types of finishing. At the same time, it is durable.
Armaflex. The basis of this product is polypropylene. The mesh has reinforced nodes, so it is used when applying a thick layer of plaster mixture. The cells have average dimensions - 12x15 mm.
Plurima is also made from polypropylene. As a rule, the cells are small in size - 5x6 mm. It is resistant to aggressive chemical components. Used for external and internal finishing works.
Syntoflex - has a polypropylene base, medium and large cells. Suitable for all types of finishing.

Types of reinforcing mesh for walls

The mesh for finishing work acts as a frame that holds the entire structure from destruction.

Before using reinforcement, other building materials were also tested. Experts wanted to get strength, high adhesion, elasticity and durability from them. However, not all options survived testing. Special requirements are imposed on materials that are used for exterior finishing, because... Temperature changes, moisture and other climatic factors have a negative impact on the surface.

The following meshes are most often used for plastering facades:

metal;
fiberglass;
polyurethane;
fiberglass;
lavsan;
from modified basalt glass (only for wooden surfaces).

Basalt

Basalt mesh has become widespread in the reinforcement of buildings made of foam blocks. Benefits include:

low thermal conductivity;
resistance to mechanical stress and chemicals;
light weight;
durability;
environmental friendliness.

Basalt is not inferior in strength characteristics to metal reinforcement, but it is more durable and better resists corrosion.

Basalt mesh is more durable than metal mesh, because it is not subject to corrosion

Fiberglass

Fiberglass reinforcing mesh boasts all the performance characteristics of a plastic material. But unlike polymers, fiberglass exhibits chemical resistance, increased strength and higher tensile strength. The parameters of the fiberglass sheet largely depend on the size of the cells; also, to evaluate the characteristics of the mesh, the so-called density is used, which is measured in g/m2. Based on network density, they can be divided into three groups:

Density within 50-160 g/m2. Suitable for work inside the house. Grids are divided into plaster and painting - the latter demonstrate lower density, and the standard cell sizes are respectively 2x2, 3x3, 2.5x2.5 mm. In plaster sheets, the cell size is significantly larger - the most popular options are 5x5 mm, the density of such a product is also higher.
Density within 160-220 g/m2. – used for plastering and puttying on facade walls. The most common cell sizes are 5x5 and 10x10 mm.
Density within 220-300 g/m2. – this mesh is used for the basement and underground part of the building. The use of reinforcement provides the finish with anti-vandal properties, since it is able to withstand severe mechanical and impact loads. Due to the larger amount of material used in the production of such materials, their price will also be higher.

In order not to be mistaken about the purpose of the mesh, it is worth understanding the rules for marking such material:

C – network;
CC – fiberglass sheet;
N – exterior finishing;
B – interior decoration;
Ш – for painting work;
A – base anti-vandal;
U – with amplification.

Manufacturers indicate information about the technical characteristics of the material on the packaging.

In production, fiberglass mesh goes through the stage of increasing resistance to an alkaline environment, which is relevant for putty and plaster solutions. To prevent the fabric from dissolving in a weak or medium alkaline solution, the fiberglass is impregnated with a polyacrylic dispersion, which reduces the aggressive effects of an alkaline environment.

This mesh is sold in the form of a 1m wide sheet, sometimes the material is sold in the form of cut rectangles. The material is actively used for reinforcing seams, corners, etc.

Plastic reinforcing mesh

Modern polymer materials are very different from the first plastics. Thanks to this, not only massive products appeared, but also mesh ones that demonstrate high strength. This is how a new material appeared for reinforcing masonry and plaster coating. Polymer mesh fabric is made from polyurethane or polypropylene (for example, Plurim). In some qualities these materials are superior to metal ones.

For example, the advantages of plastic plastering mesh are as follows:

no fastening to the base is required, since polymer materials are lightweight;
light weight of rolls, ease of transportation;
moisture resistance (no corrosion or rust stains);
no rotting;
environmental friendliness;
resistance to vibration loads and elasticity;
retain properties when temperatures drop to – 40°C or rise to + 100°C;
lower price than metal and fiberglass products.

Flaws:

some plastics are not resistant to chemical “aggressors”;
A layer of solution thicker than 6-8 mm cannot be applied on top of a plastic mesh product.

Polyurethane mesh for plaster is inert to chemicals, therefore it is allowed for use in industrial buildings.

Products are distinguished according to two main parameters:

shape and size of cells;
degree of density (the maximum allowed load on the plaster coating depends on this value).

Polymer network meshes come in two configurations. For reinforcement, fabrics with cells are used:

square shape (the letters PCF or SQ are indicated in the marking);
diamond-shaped.

The latter are easier to manage when plastering is done alone. For interior work, mesh fabrics with 5 mm cells are used, for facade work - larger ones (from 10x10 mm).

In terms of density, products with values ranging from 70 to 165 g/sq.m. are universally used.

There is no need to attach the polymer mesh to the base with additional devices. It is enough to apply a layer of plaster or adhesive mortar to the wall, apply and straighten the canvas, running a spatula along the top with slight pressure, and “drown” the product into the layer. There should be no areas on the surface uncovered with the plaster mixture.

Serpyanka is the thinnest of the meshes. The scope of use is not limited to the cases already described. Serpyanka is used to cover the places where window and door blocks are attached to the wall.

Tapes vary in:

material;
weaving density;
the presence of an adhesive layer (self-adhesive or without glue);
strip width;
place of use (indoors or outdoors).

Separate fastening of the serpyanka to the base is not required. It is applied to a layer of putty or plaster mixture, leveled with a spatula and, if necessary, an additional thin layer of composition is applied on top. Instead of serpyanka, fiberglass is sometimes used, the difference being that it does not have cells.

The tape, intended for interior work, has cells with a side of up to 4 mm. Serpyanka for facades has thicker threads and a cell size of 5 mm.

Metal

Metal facade mesh for plaster can strengthen not only the plaster layer, but also the walls themselves. This mesh is the most common option for finishing facades, plinths, and so on.

The choice of material is determined by its purpose, which determines the size of the cells, the thickness of the wire, and the method of fastening metal rods/wires:

When plastering, a woven metal mesh is used, the structure of which resembles the structure of fabric, only metal wire is used instead of thread. The main characteristics of this material are small cells measuring from 1 to 2 mm or more. The wire used for the manufacture of such networks is protected from corrosion destruction, and therefore can be made of either stainless steel or carbon steel, but with protection from a layer of zinc or polymers.
Chain-link is also considered in demand - due to its large cells, it creates a reinforcing relief layer that allows you to hold a thick layer of finishing material on the wall.
Welded mesh made of wire rods welded to each other is also used to strengthen the masonry of walls, installation work, strengthening load-bearing surfaces, foundations, and so on.
Masonry mesh is another version of a metal reinforcing material that is used for strengthening walls, plastering, pouring screeds, and so on.
Plaster network made of metal is used exclusively for plastering. It is made from hot-dip galvanized wire, and therefore is not susceptible to corrosion.

How to attach fiberglass mesh for plaster

Fiberglass mesh is used when applying coatings from 3 to 30 mm. When purchasing, you should pay attention to the compliance of the characteristics of this mesh with standards. The cells must be at least 5x5 mm in size and also have sufficient density. In addition, the product must be resistant to alkaline substances. Before installation work begins, the mesh is cut into fragments, the size of which depends on the method of arrangement. The product can be placed in a longitudinal or transverse position. If there are rustics on the ceiling, it is necessary to place mesh fragments along each seam. In their absence, the placement method does not matter much. But the mesh must cover the working surface completely. When cutting, it is recommended to leave a margin of 15 cm to strengthen the seams between the ceiling and walls.

Fastening is carried out as follows:

The first layer of solution is applied to the surface.
A mesh is placed on top, which needs to be pressed into the plaster.
Next, the next layer is applied. As a result, the mesh is placed in the middle of the finishing coating. When performing this operation, you can wait for the first layer to dry, but this is not a prerequisite.

When applying a thin layer, it is recommended to fasten using screws and staples. The work is performed in the following order:

Markings are applied under the beacons, according to which holes are drilled.
Next, dowels are inserted into them.
The screws are mounted level on each line of beacons.
After which the first layer is applied along the width of the mesh.
Then a mesh is laid on the covering.
Next, the adjacent canvas is attached. And in this way the entire surface is processed. The canvases overlap each other, the overlap of which should be at least 10 cm.
Then you need to put on metal beacons and apply plaster. When working with fiberglass mesh, the plaster composition is applied evenly over the entire surface, after which it is smoothed from the middle to the edges.
To fix the ends of the mesh, use rules or a wide spatula.

How to choose the right mesh for wall reinforcement

The choice of material depends on various factors:

composition of the plaster mixture;
material of plastered structures;
plaster thickness;
operating conditions.

To reinforce cement-based plaster mortar, a mesh that is resistant to alkalis is selected. When using gypsum solutions, any reinforcing material will do.

It is not economically feasible to use heavy-duty, expensive imported reinforcing materials. It is better to opt for domestic meshes, which are not inferior in technical characteristics to foreign analogues.

What is the function of the grid?

When plastering walls without using a reinforcing layer, there is a high risk that the applied solution will simply fall off the base. And when finishing brick and wooden surfaces, the plaster may begin to peel off and crumble even after repairs have been completed. This usually occurs due to insufficient adhesion of the materials indicated above. The mesh allows you to form a monolithic slab that is not afraid of any loads. Different meshes are designed for a specific load, and the type of material used depends on the thickness of the plaster layer.

Reinforcement of plaster with mesh

On a note! With the help of reinforcement, a durable coating is created that will not crack during long-term use. Even if the solution preparation technology is violated, the mesh will ensure the integrity of the plaster layer.

Which one is best to use for plastering?

Reinforcing mesh is produced for a specific type of work. To determine the choice, there are several rules:

A 3 cm layer of applied mortar should be made of fiberglass.
Metal gratings are used when applying a solution with a thickness of 3 cm or more. When carrying out external work. And also for plastering baths and swimming pools.
The plastic cell is designed for coating with gypsum solutions.
Serpyanka and other tapes are used to reinforce plasterboard joints and cracks.
Chain-link and fiberglass are used to finish the stove and fireplace. The first option is for cement-clay mortar, the second is for thin plaster.

These rules will help in choosing cellular fabric for certain jobs.

For interior work

For interior work, several types of mesh are used.

Polymer material. Used for plastering surfaces with gypsum-based mixtures. A 2x2 cell will withstand gypsum mortar and will not crack the surface.
Fiberglass. Mounted on a rough foundation made of brick or concrete. Holds cement mortar perfectly. It shrinks less, and when dry, cracks do not appear on the surface.

Attention. Using cellular fabric, the work goes quickly and easily. The surface is durable and has a long service life.

For outdoor

To work with outdoor surfaces, you need to choose the right mesh. To do this, follow the rules:

the choice depends on the plaster used;
dimensions of the surface on which the work will be carried out;
thickness of the mortar layer applied to the walls;
humidity, temperature changes.

Fiberglass cloth. Working with small square meters of facade surface.

Metal applicable:

The wall area is large;
a wall made of aerated concrete or brick, as well as wood;
if there is high humidity or sudden changes in temperature;
if the mortar used is cement-based;
if increased strength is needed for the walls of the building.

Reinforcing metal is available in the following options:

Chainlink.
Welded type.
Expanded metal mesh PVA;
Solid drawn PVA.

I use different types of meshes for different jobs.

For the ceiling

Light nets are especially suitable for gypsum plaster ceilings. When thin-layer plastering, the threads of synthetic products overlap more easily, which reduces the consumption of plastering materials.

Often the ceiling in old-type houses is “decorated” with rustics - they are sealed with mortar with sickle reinforcement, or a mesh fabric is placed in accordance with their direction. The entire ceiling surface must be covered with canvas (the joints overlap by at least 10 cm). The corners of the junction of the wall and the ceiling plane are also reinforced with overlap.

Which one to choose

When choosing a mesh for plaster, you should follow these rules:

if the plaster layer is no more than 30 mm, then the reinforcement is carried out with fiberglass cloth;
for a layer thickness of 30 mm or more, metal sheets with high strength are used;
plastic cells are often used to apply gypsum mortar to the wall;
sickle and tape are applied to the joints between the drywall;
The fireplace and stove are finished with fiberglass and metal sheets, as they can withstand the negative effects of high temperatures.

Reinforcing fabric is used for plastering walls outside and inside the house. Different materials are used for interior work. Polymer fabric goes well with gypsum mortar. It prevents the formation of cracks on the surface. Fiberglass sheets are fixed to concrete and brick walls. Maintains cement mortar and prevents cracking after drying.

When finishing external walls, metal mesh is often used. Fiberglass cells are suitable for processing small façade surfaces. Pay attention to the thickness of the layer, the size of the wall, the type of plaster composition and the climate in the region.

Technology of plastering walls on a grid

The technology itself is quite simple and if you have at least minimal experience, the process takes very little time. The main thing is to do everything in strict sequence in order to get a truly high-quality processing result.

Preparing the walls

First of all, it is necessary to prepare the surface of the walls for further treatment with plaster. Some may think that if a mesh is used, this stage can be skipped, but in fact this is not the case and preparation should never be skipped.

First, the wall must be freed from the old coating. Everything is carefully removed so that the surface is perfectly clean.
Then you need to try to remove the dust as efficiently as possible. If there is fungus or mold on the surface of the wall, each affected area is carefully treated using a special metal brush.
Only after this can you begin to treat the walls with a primer. Due to this, the quality of grip will be several times better. The base will be more durable, and in the future the risk of mold, mildew or corrosion will be much less.

It is very important to approach this stage responsibly, because the final result will largely depend on how well the facade surface was prepared.

Why do you need a reinforcing façade mesh?

Finishing of facade walls is carried out using various materials and technologies. Reinforcing stack is used in two cases.

To improve the performance characteristics of the plaster layer. For such purposes, it is better to use a metal mesh made of galvanized wire.

Galvanized welded mesh

Reinforcement is recommended to be used on façade walls made of foam concrete blocks; no additional measures are required for brick walls.

All metal mesh

The fact is that among the many advantages of foam blocks, you must definitely pay attention to one very significant drawback - low physical strength. Another problem is that concrete blocks begin to crumble when they freeze/thaw under conditions of high specific humidity. As a result, the cement plaster begins to peel off with all the negative consequences.

Foam block plaster

The reinforcing mesh allows the plaster to adhere to the wall surface. Conversations that such a mesh should be used when the plaster is thick, and that this prevents cracks from appearing on the plaster, are only partially confirmed. Firstly, there are simpler and cheaper methods to prevent cracks from appearing in thick plaster. The simplest one is to spread the solution in a thin layer in several stages. Secondly, the adhesion of the mortar to the façade wall can be increased by slightly increasing the amount of cement in the mortar. If this is not enough, then spray it with cement laitance.

To protect façade wall insulation from damage. Reinforcing facade mesh is used during the finishing of foam insulation boards.

Plastering on foam plastic

Not to improve the fixation of glue to the surface of polystyrene foam and to prevent cracks, as some “sofa” builders write, but precisely for mechanical protection.

Reinforcement

Why do we say this? The surface of expanded polystyrene is protected from the negative effects of ultraviolet rays and, oddly enough, damage from birds. For some unknown reason, birds are very fond of pecking at polystyrene foam; if you leave it unprotected, many large and small depressions will soon appear on the surface. Conclusion - polystyrene foam needs to be covered. The cheapest and most reliable method is to use glue.

By the way, the advertising characteristics of manufacturers of plastic reinforcing mesh “they are not afraid of UV” do not in any way affect their actual performance indicators. The fact is that even the thinnest layer of glue or other cement-sand mixture does not completely transmit ultraviolet rays. Why should the consumer pay for features that he does not need? And one more nuance. Most often, builders fix the reinforcing mesh on the entire wall. We think that this is done either out of ignorance of the physical properties, or by the desire to earn more money. We recommend using reinforcing mesh to a height of 1.5–2.0 meters; there is no need to go higher. No one will damage the finish screed on the foam that high. Mechanical damage occurs due to various impacts, careless maintenance work near the facade wall, etc.

Methods for attaching different types of nets to walls

Each type of mesh that can be found on sale today has its own fastening features, which are very important to consider. Otherwise, the result will not please you, and the finish may soon begin to deteriorate.

Synthetic reinforcement products

In this situation, it is necessary to attach the material to the wall surface exclusively along the perimeter of the mesh. First, you need to securely secure the upper edge of the canvas using self-tapping screws, and then gradually attach all the other sides of the mesh used. There is no need to use any more additional products for fastening, because in the future the mesh will be secured as securely as possible using a layer of plaster.

As a rule, synthetic mesh is sold in rolls. To make installation take less time and require less effort, it is best to start fixing it along the wall parallel to the floor. You can start attaching the top part from absolutely any angle. It is worth paying attention to the fact that the joints must be overlapped with an overlap of up to 20 centimeters. Experts recommend cutting the canvas in such a way that a solid mesh is stretched over the entire wall. Due to this, it will be possible to increase the strength of the plaster layer several times.

Metal reinforcement products

In order to be able to work with metal materials, the additional use of self-tapping screws, construction dowels, and special metal mounting foam will be required.

All these materials should be prepared in advance.

Before proceeding with installation, you need to cut the required piece of mesh. In this case, the builder must measure the area of the area on which he intends to apply plaster in the future. Metal scissors are used for cutting, because the mesh is made of a fairly thin material. If wire with a thickness of more than 2 mm was used for the mesh, then it can only be cut using a grinder. The canvas must be thoroughly degreased. To do this, a rag is moistened in a solvent, and then the surface of the mesh is wiped with it.
The fastening in this situation will start from the ceiling. The top of the material must first be attached along its entire length using self-tapping screws. In this case, special cut pieces of polyurethane foam must be placed under the caps. You can also replace gaskets with wide washers, but the cost of such products is much higher than metal tape.
When installing the mesh on a brick or concrete surface, you will need to make a certain number of holes in the wall into which plastic dowels will be inserted.
The distance between the dowels used will depend on the exact thickness of the mesh used and the size of the cells. At the same time, experts recommend that the step width be no more than half a meter. In those places where the canvas is securely fixed, most often it is adjacent to the wall. In the case of those places that are between the fastenings, it should under no circumstances come into contact with the wall. Otherwise, the quality of the plaster layer will be several times worse.
It is worth paying attention to the fact that at the joints the metal mesh must be installed with an overlap of up to 10 centimeters.
If the canvas is fastened correctly, it will be very well stretched. If the mesh vibrates in some places, it means something was done incorrectly. Because of this, voids will form under the mesh, which will negatively affect the quality of the finish.

Question answer

Is it possible to repair peeled areas with façade reinforcement mesh? It is possible, but it is better to avoid such situations. Unfortunately, in most cases, peeling appears several months or years after finishing the insulated façade walls.

Repair of peelings

How is the repair done?

Inspect the peeled area. Using your hand, check the strength of the mesh fixation next to the detached area. Prepare materials: glue and a piece of plastic reinforcing mesh. If the facade walls are painted, then you need to have the appropriate paint.
Pull the peeled mesh towards you and use a sharp mounting knife to cut it around the perimeter. Work very carefully, do not damage the foam. If the sect continues to flake off during cutting, great. In this way you remove the entire problem area; in any case, it would peel off over time.
Cut a new mesh for the patch, the size should be slightly larger than the cleared area for the overlap.
Remove the layer of old glue from the surface of the foam.
Using a spatula, carefully remove the top layer of glue from the surface of the remaining mesh to the width of the new overlap. Apply the first layer of glue, embed the mesh into it and apply the second layer of glue.
After it dries, level it. Pay special attention to the docking area. It should be as smooth as possible without sudden changes in height.

Repair of a peeling area

How does the quality of plastic mesh depend on its price? Almost nothing. When choosing a mesh, pay attention to the thickness of the fabric and the size of the mesh cells. All other characteristics are nothing more than advertising gimmicks of the manufacturers.

Plastic mesh

What is better than a plastic anti-corrosion coating for metal reinforced mesh against galvanizing? Nothing, besides, the price of such a mesh is higher than with galvanized wire. You need to know that the adhesion of all cement mortars to plastics is significantly lower than to galvanized surfaces. As for the service life and load-bearing capacity, these indicators are absolutely identical.

Metal mesh with polymer coating

Is it possible to do without reinforcing mesh when plastering uneven façade walls? Not only is it possible, but it is necessary. We have already talked about simpler and more effective methods of working with such surfaces. Reinforcement with metal mesh is used not to prevent the appearance of cracks, but to increase the bearing capacity of cement-sand mortars. It is needed when screeding the floor. One more nuance. The indicators of linear thermal expansion of metal and solution differ significantly. This means that microcracks will certainly appear in the places where cement and metal mesh meet, because outside temperatures fluctuate within significant limits. In enclosed spaces there are no such fluctuations.

Should I use reinforcing mesh on the basement surfaces of façade walls? Use this technology only for foam-insulated bases. In all other cases it is not needed.

Photo - a cake made of insulation and mesh for reinforcement

How much does the cost of finishing facade walls increase due to the use of reinforcing mesh? The cost of finishing increases by no more than 3–5%. But if we take into account possible repairs due to mechanical damage to the foam, then a slight increase in cost is completely justified.

Options for plastering walls

A very important stage in finishing the facade is directly plastering the surface of the walls. It is necessary to approach this process as responsibly as possible, because the final result largely depends on it. Plastering walls on a grid should be carried out in several stages. At each stage, one layer of the solution prepared in advance will be applied.

Experts recommend doing two, or better yet, three layers of plaster. It is worth choosing the number of layers taking into account what kind of surface will be processed. The very first layer of finish must be applied by “spraying”. That is why, when preparing the solution, it is worth remembering that its consistency should be similar to fairly liquid sour cream. When the solution is ready, it must be applied to the wall surface using a special trowel. It is worth noting that this can be done in any order, whichever will be most convenient in each individual case. Of course, the solution can be spread on the surface of the wall, but the first method will take much less time. Then the mixture is leveled using a spatula. The thickness of the first layer should not be more than one centimeter.

When the first layer is completely dry, you can begin the second stage of plastering the surface.

To do this, make a thicker solution that will resemble dough. It is applied to the walls using a trowel and then leveled using a rule. It must be pressed against the installed beacons and carefully inserted from the bottom up. This layer must completely cover the mesh that was used for reinforcement. When the solution has set well enough, it is necessary to carefully pull out the profiles, and carefully seal the grooves that remain after them with the solution.

The last stage is leveling the surface of the walls. To do this, a fairly liquid solution is made, which must be applied to the walls in a circular motion with a trowel and thoroughly rubbed over the surface.

Installation of beacons

In order to properly install the beacons, you will need to use a building level. It must be set so that the outer profile is in a vertical position. Then the profile needs to be secured using two self-tapping screws. After this, the lighthouse is fixed by using a small amount of gypsum mortar. Only after this can you begin to place a beacon on the other side of the wall. In order for all profiles to be in the same plane, a thread must be stretched between the outer guides. After this, you can install all other beacons. It is worth paying attention to the fact that they should be set so that the distance is less than the length of the rule used.

Fastening the mesh using the correct technology

First you need to calculate the amount of canvas that will be required to complete the work. The method of fastening will depend on the type of base and the material itself. In any case, the cellular fabric must be secured strictly according to technology, avoiding strong tension or sagging.

Fastening the reinforced mesh

If lightweight products are easily fixed to the mortar by rubbing it in with a spatula, then thicker, more durable materials need to be fixed more securely. The operating procedure will be as follows:

measure the required amount of material, carefully cut off a suitable piece;
Secure it at the top with dowel nails, smooth out the corners and secure with self-tapping screws;
repeat a similar operation from below, ensuring the optimal degree of tension;
At the end of the work, attach the material in the middle so that it fits well to the rough base.

Installation of metal mesh under plaster

How to fix a product under a plaster base

Colored and other decorative fabrics are secured with simple self-tapping screws. At first, they are not completely screwed into the base at equal intervals according to the markings. Then put on the mesh and screw the screws into the wall completely. Sagging of the canvas must be completely eliminated! Small pieces of material or temporary coverings can be attached to the foam.

Fastening the mesh for drywall plaster

Coating with polymer sheets

Typically, such canvases are fixed with a mortar and a spatula. Cut the mesh into pieces of the required size, taking into account seam allowances. Apply a layer of plaster, carefully press a piece of material into it, and smooth it with a spatula. The fabric is overlapped so that one strip overlaps the other by 15–20 cm. If the walls have a complex configuration, the fastening is additionally reinforced with staples, screws or dowels.

Plastering walls with polymer canvas

Metal coatings

For a layer of plaster equal to 3–5 cm, a metal mesh is usually used. It weighs quite a lot, so it must be securely fastened. Before starting work, the canvas is degreased to remove dirt and lubricant residues. Traces of rust on carbon steel are treated with an anti-corrosion compound. Cut out pieces of the required size depending on the placement method (crosswise or lengthwise) using metal scissors or a grinder.

In the structure, holes with a diameter of 6 mm and a depth of 3 mm greater than the length of the dowels are drilled using a hammer drill. The approximate distance between the holes is made equal to 25 cm. The mesh is fixed to the wall with an overlap, starting from the top corner, and the edges are fixed with new dowels. The material is not pulled too tightly so that after plastering it can take an optimal position. Afterwards, the plaster is applied in several stages with intermediate drying of the layers.

Fastening the chain link to the wall

Meshes from popular manufacturers

The Italian concern Tenax produces mesh for plastering walls and other structures. In the product line:

Armaflex is a biaxially oriented network made of polypropylene for plaster coatings with a thickness of 1-3 cm. Weight 100 g/m2. Withstands tensile load –
Armatek – plastering fiberglass mesh. Density 110-138 g/m2.
Polypropylene Sintaflex E can fully replace hardware in terms of strength. It is used for plastering walls up to 7 cm thick, reinforcing concrete screeds, and also for protection against moles.
Plurima is a polypropylene product with small cells 5x5 mm. The area of the rolled fabric is 250 m2. Roll weight – 10.4 kg. Chemically resistant. Used for thin layers of decorative plaster and brickwork.

All products are universal, chemically inert, resistant to UV rays, and geometrically stable.

As for the plaster facade mesh sheets Valmiera, Alabuga, Bautex Eurofacade, Vertex, Textile Glass, they cannot be used inside the plaster layer, since they do not strengthen, but separate the plaster into two layers. They are used only by placing them inside a reinforcing layer of polymer glue, into which they are embedded.

Experience shows that the mesh for plaster is a very important element that helps prevent the appearance of cracks and destruction of the plaster layer under vibration loads and settlement of the building. It also protects facades covered with thermal insulation from destruction. The correct choice of reinforcing product and adherence to technology guarantee durability and long-term preservation of the appearance of the finish.

Purpose of reinforcing materials on the wall for plastering work

Plaster reinforcement is an effective, time-tested technology for improving the characteristics of a leveling coating.

Painting mesh for plaster performs the following functions:

Helps create a coating layer of greater thickness than specified by the manufacturer. This allows you to solve the problem of uneven walls. Sometimes, to create a uniform and smooth surface, it is necessary to apply more mortar than the structure can withstand.
Creates conditions for the formation of a solid layer, protects it from shrinkage cracks and their consequences. This is especially important for finishing ceilings, door and window openings. The reinforced mesh helps prevent peeling and subsequent collapse of the finish.
Increases the durability of the finishing layer. Thanks to the mesh, the coating can withstand heavy loads. For example, this is important if cabinets or heavy shelves for books and other items are mounted on the wall. Thanks to the reinforcing layer, the load on the wall is reduced.

Reinforcement is subject to a solution of any composition whose thickness exceeds 3 cm.

Cases when you need a façade mesh for plaster:

when performing work with a large thickness of the mixture - partially or over the entire base;
if the building is located close to other buildings and complexes, which, in turn, have a vibration effect on it;
if neighboring premises have undergone redevelopment and the specific weight of the structure has been redistributed;
to modify the initial durability characteristics of the coating - increases the load-bearing capacity for placing attached household equipment and furniture.

Question of price

The price of reinforcing mesh depends on the material, technical and operational parameters and manufacturer.

In different stores and construction markets, reinforced lattice of even the same type can vary significantly in cost.

To purchase the material at a favorable price for you, it is better to contact the manufacturer.

Average prices for 1m2:

metal, made of galvanized wire Ø 0.25 mm - 470 rubles;
welded galvanized, made of steel Ø 1mm - 250 rubles;
fiberglass - 25 rubles;
plastic - 20 rubles;
polypropylene - 22 rubles;
foam propylene - 65 rub.

You can take advantage of sales and seasonal discounts that large shopping centers offer at the end of the construction season.

Any reinforcing material is suitable for strengthening the plaster layer. The main thing is to choose the best option for your premises.

Finishing the wall with a gypsum-based composition

The use of gypsum as a basis for plaster composition has its own characteristics. Advantages of the material :

Natural composition , does not harm the environment at all.
Light weight . Any type of reinforcing material can be used.
No shrinkage. The wall becomes smooth from the very beginning, there is no need to wait for hardening.
Moisture resistance . Gypsum can be used in bathrooms, bathhouses and other rooms where the plaster will come into contact with steam or water. This is not recommended according to building regulations, but is acceptable.
Plasticity . The composition is easy to apply, easily levels out any unevenness, and is suitable even for inexperienced plasterers.

There are also disadvantages:

Gypsum hardens quickly, so it must be formed quickly.
The material is quite expensive.

How to properly plaster reinforcing fragments with gypsum compound:

The wall is thoroughly cleaned of traces of previous coatings. Degreasing with solvents (white spirit or similar) is used if necessary.
The wall is drying out. Gypsum is moisture resistant, but does not like excess water at the time of application.
Strengthening reinforcing mesh. For this, glue can be used (if the coating is thin-layer, light) or self-tapping screws on dowels (for thick layers).
Plaster is applied. Since gypsum is a quickly hardening compound, application must be done quickly and in small areas.
When the composition has hardened, but has not yet completely hardened, the sagging is removed. This is done using beacons (guides), manually aligning the wall by eye or using a tightly stretched thread.
When the plaster has hardened, final grouting is carried out. If the plastering work was initially carried out efficiently, this can be avoided. If not, the surface is covered with a liquid creamy solution, which is manually brought to an absolutely even state using circular movements.

Attention

Gypsum plaster can be applied with or without beacons. But the latter method requires the highest qualifications from the master.

Possible mistakes

Novice craftsmen often encounter mistakes that can lead to peeling of the solution and reduced surface quality:

No primer. The primer increases the adhesion of the material. It must be used to ensure that the mortar adheres securely to the wall.
Violation of proportions. Lack of water leads to increased density. Such plaster slides under its own weight and cracks.
Adjustment of consistency with powder. The consistency of the working mixture should only be changed with water. To do this, it is administered in small portions, bringing it to the required volume.
Refusal to reinforce joints and walls in new buildings. Joints made of different materials have different technical characteristics. They differ in behavior under changes in temperature and humidity. Therefore, cracks often appear at the joints. Reinforcement helps to avoid them.
Incorrect position and fastening of the mesh. It is enough to secure the lightweight fabric around the perimeter. When using metal sheathing, fasteners are made over the entire area.
Attaching beacons to a continuous layer. To install beacons, straps with a given pitch are used.
Failure to comply with drying conditions. It is unacceptable to dry walls in direct sunlight, with a heat gun or at elevated temperatures. This leads to uneven drying of the mixture and cracking.

Drying the wall with a heat gun leads to uneven drying of the mixture and cracking. Frequent mistakes also include too thick a mixture, an excessively thick or thin application layer, and the use of low-quality materials.

Types of plaster mesh

Today, manufacturers offer two main varieties:

metal,
fiberglass (plastic).

The question of which one to choose comes up often. To determine the need for use, you will need to examine the surface of the wall for differences and irregularities. If the difference is within 5 cm, then it is better to use a metal product. If within 2-3 cm, then fiberglass will do.

Synthetic product for plaster

Recommendations from experts

It is possible to obtain a high-quality and reliable wall only if you follow advice from experts:

Alignment. The walls should be carefully leveled. The level is checked using a plumb line or laser. The better the work is done, the better the finishing is.
Taking into account the characteristics of materials. Compatible materials should be selected. Aggressive solutions are capable of dissolving the reinforcing structure.
Taking into account the maximum load and possible shrinkage of the building. In the case of new buildings and facades that are severely deformed, it is recommended to use metal reinforcement.
Final revision. Plaster is not a finishing coat. To give it decorative properties and prepare it for subsequent finishing, it requires sanding and sanding.

Experts recommend that you always sand the walls after applying plaster.
Reinforcing mesh is a necessary element for rough finishing of house facades and walls in new buildings. Its correct fastening and adherence to the technology of applying plaster allows you to create a reliable and strong coating that will last a long time.

Sources

https://mirbetona.info/finishing/setka-pod-shtukaturku
https://1beton.info/shtukaturka/setka-shtukaturnaya
https://PoShtukaturke.ru/steny-vnutri/shtukaturka-vyravnivanie/oshtukaturivanie-sten-po-setke.html
https://1pofasady.ru/shtukaturka/setka-dlya-shtukaturki-sten
https://DekorShtukaturka.ru/instrumenty/setka-dlya-shtukaturki-sten
https://oshtukaturke.ru/raznovidnosti/armiruyushhaya-setka
https://arbolit.org/sovety/tehnologiya-vypolneniya-shtukaturki-po-setke.html
https://1pofasady.ru/shtukaturka/tehnologiya-shtukaturki-fasada-po-setke

Technology

This technology itself is not very new: in old houses, especially wooden ones, you can often find walls covered with a lattice of thin wooden planks, on top of which plaster has already been applied. Now the choice of materials is much richer; it is not limited solely to wood.

Problems solved by reinforcement:

The adhesion of the plaster solution increases.
The coating becomes stronger. Having hardened in a single layer, the plaster turns into a monolithic layer.
This method helps to some extent correct the master’s flaws. Even with an ineptly applied mortar, the reinforcing mesh will hold the plaster, preventing it from crumbling (read what to do if the plaster begins to crack and crumble here).