Facade finishing is one of the most important construction operations. Exterior wall cladding is exposed to precipitation, freeze/freeze cycles and harsh ultraviolet rays. Such difficult operating conditions put forward increased demands on the quality of the finish. Eliminating defects on facade walls is very expensive and time consuming. We will have to mount scaffolding, wait for good weather, remove construction debris. To prevent the occurrence of unpleasant situations, you need to take all measures to prevent them.
Finishing of front walls is carried out by various materials and technologies. The reinforcing stack is used in two cases.
To improve the performance of the plaster layer. For such purposes, it is better to use a metal mesh made of galvanized wire.
All-metal mesh
The fact is that among the many advantages of foam blocks, it is necessary to pay attention to one very significant drawback - low physical strength. Another problem is that concrete blocks begin to crumble when freezing / freezing in conditions of high specific humidity. As a result, cement plaster begins to peel off with all the negative consequences.
The reinforcing mesh allows the plaster to adhere to the wall surface. The talk that such a grid should be used with a large thickness of the plaster, that due to this, cracks do not appear on the plaster, have only a partial confirmation. First, there are simpler and cheaper methods to prevent cracks from appearing in thick plaster. The simplest is to throw the solution in a thin layer in several stages. Secondly, it is possible to increase the adhesion of the mortar with the facade wall due to a slight increase in the amount of cement in the mortar. If this is not enough, then a spray of cement milk is done.
To protect the insulation of facade walls from destruction. The reinforcing facade mesh is used during the finishing of foam insulation boards.
Not to improve the fixation of the adhesive to the surface of the expanded polystyrene and to prevent cracks, as some "sofa" builders write, but for mechanical protection.
Why do we say so? The surface of expanded polystyrene is protected from the negative effects of ultraviolet rays and, oddly enough, from damage by birds. For some unknown reason, birds are very fond of pecking foam, if left unprotected, then soon many large and small depressions will appear on the surface. Conclusion - polystyrene foam must be closed. The cheapest and most reliable method is to use glue.
By the way, the advertising characteristics of manufacturers of plastic reinforcing meshes “they are not afraid of UV” do not affect their actual performance in any way. The fact is that even the thinnest layer of glue or other cement-sand mixture does not completely transmit ultraviolet rays. Why should a consumer pay for properties they don't 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 physical properties, or a desire to earn more. We recommend using a 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 foam plastic so high. Mechanical damage occurs due to various impacts, careless chores near the facade wall, etc.
Types of facade reinforcing meshes
Facade reinforcing meshes are made of galvanized wire or polymers. The former are used for facade plaster, and the latter for universal use.
| Name | Cell sizes, mm | Roll dimensions, m | a brief description of | Approximate cost, rubles |
|---|---|---|---|---|
| Safety | 2×2 | 1×50 | Production material - fiberglass, used to reinforce plaster near door and window openings, to align the joints of insulation boards | 900 |
| OXISS | 5×5 | 1×50 | The mesh has a reinforced protection against alkalis, can withstand significant dynamic and static forces for a long period of action. | 1050 |
| Facade fiberglass mesh | 5×5 | 1×50 | For holding plaster of concrete facades and insulation boards. Withstands a tensile load of at least 1400 N/cm. | 1400 |
| STREN C5 | 22×35 | 2×25 2×50 | Withstands rough and fine facade plaster up to 5 cm thick. | 2750 |
| KREPIKS Facade 1300 | 4×4 | 1×50 | Fiberglass, there is protection against alkalis and ultraviolet radiation. | 1560 |
| KREPIKS Facade 1500 | 5×5 | 1×50 | Reduces the likelihood of cracking due to thermal linear expansion | 1970 |
| KREPIKS Facade 2000 | 4×4 | 1×50 | For reinforcing finishing plasters during the finishing of the insulation layer of the facade | 2300 |
| 6×6, Ø 0.6 mm | 1x15 | Increased strength, resistant to precipitation and sunlight | 1110 | |
| 10×10, Ø 0.8 mm | 1x15 | For rough facade plasters with a thickness of 3–5 cm | 1330 | |
| 25×25, Ø 1.0 mm | 1×25 | For strengthening facade walls, universal use. Hot dip galvanized wire, minimum coating thickness 20 µm | 1770 | |
| TsPVS grid | 20×20, Ø 0.5 mm | 1×25 | All-metal expanded metal. It has an increased area of contact with a solution of facade plaster. | 580 |
Modern facade mesh
Prices for construction reinforcing meshes
Construction reinforcing mesh
Metal mesh fixing technology
Metal meshes are used only for cement-sand facade plasters, foam insulation is not finished with them. The reason is the small thickness of the screed on foam boards. And the metal mesh cannot be aligned with such accuracy, it must be pressed with a thick layer of mortar. The metal facade reinforcing mesh is able to withstand great efforts, it is used if it is necessary to apply a thick layer of plaster on an uneven base.
The fixation algorithm has several features, the implementation of which guarantees the expected effect. You can lay the grid in both vertical and horizontal stripes. For the strength of the plaster, this does not matter, decide for yourself how it is more convenient for you to work. How to properly fix the metal mesh to the facade wall?
Step 1. Take the dimensions of the wall, cut the metal mesh along them. Select the cutting tool according to the wire diameter. Universal tool - scissors for metal.
If they are not there, then a thin mesh with a wire diameter of up to 0.8 mm can be cut with ordinary scissors. True, after that these scissors will have to be sharpened, they will no longer cut the paper.
Prices for construction scissors for metal
Step 2 The metal mesh can be fixed with dowels, the length of the hardware should provide a strong fixation. For facade walls made of foam blocks, ordinary nails 80–90 mm long can be used. They are easily hammered into blocks with an ordinary hammer, working with them is much faster and easier. Nails are much cheaper than dowels, and the quality of fixation is no different. Use dowels only on brick or concrete facade walls.
Step 3 Using an electric drill with a hammer drill, drill the first hole for the mesh. The depth of the holes should be several centimeters greater than the length of the plastic part. Otherwise, it is impossible to insert the dowel to the desired depth - the hole is slightly filled with brick chips during drilling and reduces its effective depth. It is difficult to remove it from there, it is better to drill more.
Important. The height of the protruding part of the dowels should not exceed the thickness of the plaster. Follow this parameter on the entire area of the facade wall so that during plastering you do not have to adjust the dowels.
Step 4 Drill holes in one line at a distance of about fifty centimeters, hang a net on each dowel. Pull it a little, do not allow large irregularities. The position of the line does not matter, it can be vertical or horizontal, depending on the method of attaching the reinforcing metal mesh.
Step 5 Check the position of the opposite edge of the grid, if it is uneven, then move the grid to adjacent cells.
Plaster mesh fastening - scheme
Step 6 Everything is normal - continue to fix the grid, install the dowels in a checkerboard pattern. Most metal meshes are one meter wide, you will need three rows of hardware to fix them.
Important. In places where two rolls overlap, install the dowels at a distance of approximately 10 cm from the edge. Two strips of reinforcing mesh will be hung on these dowels at the same time.
Step 7 In places of window and door openings, the mesh is cut to size. But there is nothing to worry about if you do not cut it off, but simply bend it. Just make sure that the edges of the bent sections do not protrude beyond the thickness of the plaster layer.
During the plastering of such a facade wall, the mortar must be applied in several stages. For the first time, the mass should be a little thicker than for the final alignment. Specific values depend on several indicators and are determined individually, taking into account the practical experience of the master. The consistency of the mortar is influenced by the weather, the ability of the facade walls to absorb moisture, the linearity of the wall, the maximum parameters of the irregularities, etc.
Step-by-step instructions for fixing plastic meshes
The durability of its operation largely depends on the correct implementation of the recommendations for installing a plastic reinforcing mesh on a foam insulation. In all cases, do not rush, work carefully. We have already mentioned that there is no need to reinforce the entire wall in height, it is enough to protect only the lower vulnerable area. But these are our recommendations, if in doubt - protect the entire surface of the facade wall.
Any brand of glue is suitable for gluing the mesh. Read the instructions, it should have high adhesion with plastic materials. In most cases, a final layer of adhesive several millimeters thick is applied over the plastic reinforcing mesh. The final coating is done with facade paints or a thin layer of decorative plaster.
Step 1. Examine the surface of the plates. If they were fixed with dowels, then completely drown the caps and close the recesses. At the same time, you can close the slots, but this is not necessary. The fact is that the slots will automatically close during the application of the first layer.
Step 2 On the wall, draw a horizontal line along the height of the reinforcing layer. It will help to monitor the height of the application of glue. A thin layer of material dries quickly, and this not only causes an increase in material consumption, but also negatively affects the final leveling of the layer for painting.
Step 3 Prepare the adhesive according to the manufacturer's instructions. Always fill the container with water first, and then add the dry mix. This technology will greatly simplify the mixing process. Mixing can be done manually with a trowel or with a mixing attachment to an electric drill.
The second method is not only easier, but also more efficient. You need to mix for several minutes, and then leave the mixture to stand for another 5-6 minutes. During this time, the moisture will be evenly distributed throughout the volume, the smallest dry lumps of glue will completely disappear.
Step 4 The glue is applied to the wall with a spatula, the longer it is, the smoother the surface is in the end. Professionals work with spatulas up to 70 cm in size, beginners can use shorter ones at first.
Practical advice. If you are just learning how to apply glue to the surface, then it is better to immediately get used to working with both hands. One gets tired - connect the second hand. Believe me, it is not so difficult, you just need to show a little endurance and patience.
Apply glue to the spatula with a trowel in the center of the tool. The quantity will be determined empirically. While applying the layer, hold the spatula at an angle to the foam plates, press with medium force. Achieve a layer thickness of approximately 2-3 millimeters. Do not prepare a large amount of surface at once; for beginners, two meters per dyne is enough. If you do not have time to fix the mesh, the glue will harden, you will have to remove the old layer and make a new one.
Step 5 Try on the location of the plastic reinforcing mesh. If it does not fit into the window opening, trim the material.
Step 6 Glue one end of the grid, align it horizontally to the length of the prepared section of the wall. Make sure that the mesh lies flat without distortions and bends, be guided by a pre-drawn line on the foam.
Practical advice. The mesh should overlap with about ten centimeters. You can find recommendations not to smear the place of overlap of one line with glue, but to do it simultaneously for two rows. We do not recommend doing this, it only complicates the work. Glue the first row of mesh immediately across the entire width, including the overlap. The second line will be glued on top of the freshly applied glue. This method simplifies mesh fixation and has a positive effect on quality.
Step 7 With your hand, press the mesh to fresh glue in several places, check its position again.
Step 8 With a spatula, begin to press the mesh to the surface of the insulation. Make sure that the glue of the first layer protrudes over the entire surface and evenly covers the mesh cells on the front side. If there are places with insufficient thickness of the adhesive, apply it again over the reinforcing mesh. Such omissions may appear in inexperienced craftsmen. Over time, you will learn to determine the optimal thickness of the glue by eye and there will be no more gaps. Smear excess solution on free surfaces. You should not try to immediately make the surface perfectly flat, but you need to strive for such a result.
Step 9 Give the glue time to dry. It is better to leave it overnight, it is recommended to finish the surface grouting the next day.
That's the whole technology, the surface of the facade wall is prepared for painting or finishing with other materials. We remind you once again that plastic reinforcing mesh on insulated facades is used not to prevent cracks on the adhesive surface, but to prevent mechanical damage to the foam. Keep this in mind when making a decision.
Prices for popular types of putty
Putties
Facade mesh for building protection
Compliance with safety regulations during construction work on multi-storey buildings is one of the main requirements for all developers. This is especially true for objects being built within cities. The facade mesh is fixed on the scaffolding and prevents construction debris and tools from falling onto pedestrian walkways. For such purposes, the cheapest of the plastic reinforcing meshes is used; after dismantling, it is suitable for direct use.
"Emerald" - a new grid for scaffolding
Question answer
Is it possible to repair exfoliated sections with a reinforcing facade mesh? It is possible, but it is better not to allow such situations. Unfortunately, in most cases, delaminations appear several months or years after finishing the insulated facade walls.
How is the repair done?
- Revise the delaminated area. By hand, check the strength of the fixation of the mesh next to the exfoliated 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 cut it around the perimeter with a sharp mounting knife. Be very careful not to damage the foam. If during cutting the sect continues to flake off - excellent. In this way, you remove the entire problem area; in any case, it would exfoliate over time.
- Cut out a new mesh for the patch, the size should be slightly larger than the freed area for the overlap.
- Remove a layer of old glue from the surface of the foam.
- With 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, sink the mesh into it and apply the second layer of glue.
- After it dries, smooth it out. Pay special attention to the connection point. It should be as even as possible without sudden changes in height.
How does the quality of a plastic mesh depend on its price? Almost nothing. When choosing a grid, pay attention to the thickness of the canvas and the size of the grid cells. All other characteristics are nothing more than advertising ploys of manufacturers.
What is better than a plastic anti-corrosion coating of a metal reinforced mesh from galvanizing? Nothing, in addition, 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 much lower than to galvanized surfaces. As for the service life and bearing capacity, these indicators are absolutely identical.
Is it possible to do without reinforcing mesh when plastering uneven facade walls? Not only possible, but necessary. We have already talked about simpler and more efficient methods of working with such surfaces. Reinforcement with metal mesh is used not to prevent cracks, but to increase the bearing capacity of cement-sand mortars. It is needed during the floor screed. One more nuance. The parameters of linear thermal expansions of the metal and the solution are significantly different. This means that microcracks will definitely appear in the places where cement and metal mesh adhere, because outdoor temperatures fluctuate significantly. There are no such fluctuations in enclosed spaces.
Should reinforcing mesh be used on the plinth surfaces of facade walls? Use this technology only for foam-insulated plinths. In all other cases, it is not needed.
Photo - a pie 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 fully justified.
Video - How to glue reinforcing mesh
In order to level the wall with a plaster mixture, preliminary preparation is required, which consists in surface treatment and the installation of beacons. In this case, a metal or polyurethane mesh is often used. This material gives the surfaces high strength.
Application area
Metal mesh for plaster is quite in demand in the modern construction market for reinforcing surfaces. Long before this shingles were used for these purposes, now the metal mesh has completely replaced this material.
Using the grid allows you to:
- reduce the size of cracks on the surface;
- increase the service life;
- improve the quality of decorative finishes.
The scope of the grid for plaster depends on its type.
The plaster will lay down well if the walls or ceilings are previously well cleaned and primed. The use of metal meshes can only reduce the number and size of cracks, making them almost invisible.
For more information about the areas of application of the most common grids, see the table:
| Plaster | Brickwork | Floor screed | Tile laying | fences | Enclosures, frames, cages | Warm floor | |
| expanded metal | ++ | + | + | ||||
| Welded | + | + | ++ | + | + | ||
| masonry | + | + |
In order to choose a metal mesh suitable for work, you should familiarize yourself with the types of reinforced mesh for plastering in more detail.
Species and types
Metal mesh is mainly sold in rolls. It can be attached to surfaces with glue, screws, self-tapping screws and similar materials.
Plaster meshes can be of the following types:
- masonry;
- station wagon (small);
- wagon (medium);
- station wagon (large);
- fiberglass;
- plurima;
- armaflex;
- synthoflex;
- steel;
- galvanized.
masonry
They are made of polymers and are used, as a rule, for brickwork. The cell sizes are 5x5 mm.
Wagon (small)
They are made of polyurethane and are used to prepare for plastering all types of surfaces. Cell sizes are 6x6 mm.
Wagon (medium)
Similar to wagon (small) but cell dimensions are 13x15 mm.
Wagon (large)
Also made of polyurethane, can be used for surface preparation in large areas, such as warehouses and workshops. The dimensions of the cells are 22x35 mm.
Fiberglass mesh
Made from fiberglass. This kind of mesh is resistant to temperature and chemical influences. Differ in the increased degree of durability and are capable to maintain even big loadings. This material is popular for leveling any surfaces. R cell dimensions 5x5mm.
Plurima
This type of grids is made of polypropylene. Light in weight, it is convenient for reinforcing both indoors and outdoors. Cell sizes are 5x6 mm.
Armaflex
Made from polypropylene. Heavy-duty, it can be ideal for reinforcing areas of increased load of plaster layers. The dimensions of the cells are 12x15 mm.
Syntoflex
The mesh is polypropylene. Differs in small weight and resistance to chemical influences. The range of application of such materials is quite wide. Well suited for leveling work indoors and outdoors. Cell sizes can be 12x14 and 22x35 mm.
It should be remembered that a layer of plaster will not protect the metal mesh from moisture.
Steel
They consist of steel rods in which the nodes are fixed by soldering. They are used only for interior finishing work, because. As a result of atmospheric precipitation, steel suffers from corrosion.
Galvanized
They consist of galvanized rods fixed in knots. Cell sizes vary. A distinctive feature is durability and strength. It is applied to works in and outside of the room.
By type of execution, a metal plaster mesh can be:
- masonry;
- netting;
- welded.
The most commonly used mesh netting, characterized by its versatility.
Summing up, we can say that metal plaster meshes can differ in the following parameters:
- by cell size;
- by type of coating (black or galvanized);
- by wire diameter;
- density.
But, according to world standards, the main parameter is surface density. This is the main thing to pay attention to when choosing a mesh for indoor and outdoor work.
For indoor work, a reinforcing mesh is used for plastering walls with a density of 110 to 160 g / m2(if the cell size is 5x5 mm). Facade mesh for plaster should have a density of 160 g/m2, because the surface of the room is exposed to atmospheric precipitation and temperature changes. When façade reinforcement, it should be taken into account that depending on the floor, the mesh density should also be different.
In order to choose the best option, it is better to consult with the seller.
The main range of metal meshes produced for plastering can be seen in the table:
Working with the grid
The steps for working with a metal mesh are as follows:
- cutting;
- installation;
- applying plaster.
It is best to cut the mesh with a grinder, although a thin one can also be cut with wire cutters
cutting
Before you start working with the grid, you need to measure the dimensions of the surface with a tape measure. Having rolled out the roll, cut off a piece of the required size with scissors for metal. Can be cut lengthwise or across. It depends on how the grid will be located. It is possible to cut the mesh with a special machine designed for these purposes, but the principle of operation is the same.
Installation and application of plaster
Previously, to improve the adhesion of the plaster mixture, the surface should be prepared by cleaning it from various kinds of contaminants.
The procedure for installing the grid under the plaster is as follows:
- with a perforator make 6mm holes every 25-30 cm. The depth of the hole depends on the length of the dowel. It is recommended for convenience to make holes with a depth of 2-3 mm more than the length of the dowel;
- insert dowels into holes;
- apply a small layer of plaster over the entire width of the grid;
- attach the mesh to the freshly plastered surface and fix the mesh with mortar, which quickly hardens;
- slightly push the grid trowel;
- neighboring piece is overlapped by 10 mm;
- press the ends of the mesh with a spatula to the surface. If the ends of the mesh lag behind the surface in some places, it is necessary to additionally fix them;
- after the first layer has hardened, put on another layer 2-3 mm thick with a trowel or spatula;
- evenly level the surface;
- on the grid fix beacons.
Reinforced mesh can be fixed in different ways. The fixing solution is most often used in small areas. The solution is applied pointwise and in a small amount, subsequently, the plaster layer is evenly distributed over the entire surface. But you can fix the mesh on the surface not only with a solution, but also with the help of devices designed for this: screws, self-tapping screws, special glue.
It should be noted that the thickness of the plaster layer directly depends on the thickness of the mesh. For instance, with a mesh thickness of 0.5 to 1 cm, the thickness of the plaster layer should be about 5 mm.
The plaster layer from 2 to 5 cm can not be reinforced at all. But, as practice shows, this is not always advisable. With such a layer thickness, the plaster can shrink, and the foundation can settle, as a result, cracks form on the wall surface.
Reinforced mesh gives the wall elasticity and mechanical strength b. If it is planned to apply a plaster layer with a thickness of 30 mm or more, the use of a reinforcing mesh is mandatory. At the same time, it is better to do it in two stages. It must be remembered that the second layer is applied after the first has dried.
Forms of leave in stores, comparative cost
The price of the grid for plaster depends on the size of the cells, type and manufacturer. It is packaged in rolls and measured by running meters. So, the length of the welded mesh is from 1 to 120 linear meters. The most widespread grid the chain-link has the sizes: height - from 1 to 3 m, length - 10-30 running meters.
Average, mesh plaster metal 5x5 will cost 800 rubles, galvanized mesh is more expensive. On average, the price of a galvanized plaster mesh (20x20 or 10x10) will be from 1500 to 1950 rubles. Welded mesh is the cheapest. Its cost per linear meter is 80 rubles.
You can see more about the metal mesh for plastering in the video:
The mesh is a rolled building material used to reinforce internal and external surfaces for various purposes. The maximum effect is observed in new houses that have not yet passed the shrinkage stage, but in a number of works it is indispensable. Cell sizes, diameter and base are different, in each case it is important to choose the right option.
The material is used to strengthen the working coating, protect the applied mixture from delamination and cracking, and prevent deformations of the finish. Its installation at times reduces the influence of mechanical, humidity and temperature influences and increases the quality of adhesion of solutions to the bases. Plastering of walls on a grid (and other surfaces) is considered mandatory when:
- External façade cladding.
- Reinforcing floor screed.
- Finishing smooth tile building materials with low adhesion, such as foam.
- Strengthening areas with a high risk of shedding plaster: openings, slopes, joints.
- Thick-layer application of the solution (over 2 cm).
- High risk of building shrinkage.
Types of grids, features and applications
The base material must be strong, alkali-resistant, as light and durable as possible, steel, plastic and fiberglass have suitable characteristics. Metal products, depending on the manufacturing method and type of web, are divided into thin and flexible woven (with a small wire diameter), woven, welded (the most rigid, recommended for high base mobility) and expanded metal, obtained by cutting holes in a stretched sheet.
Depending on the rolled products used, they are all divided into types of stainless steel and galvanized and non-galvanized wire. When using them as a grid for plaster, it is worth choosing a protected type, with a zinc coating, it better withstands the alkaline effect of cement and is less susceptible to corrosion.
Fiberglass fabric is obtained from threads of molten glass, to increase strength, flexibility and resistance to moisture, alkaline and biological effects, it is impregnated with special compounds. It is the thinnest, it is advised to choose it when finishing, applying a rough or finishing layer within 2-3 cm, arranging warm and self-leveling floors. The characteristic properties also include high thermal stability (up to 1500 ° C), this plaster mesh tolerates temperature extremes well. The intended purpose of fiberglass is determined by the size of the cells (for interior work, it is advised to buy a canvas 2 × 2 m, for facades and exterior - 5 × 5).
The polypropylene-based variety is universal, its advantages are lightness, compactness, strength and affordable cost. The specific option depends on the size of the cells: small (up to 6 × 6) is used to reinforce thin-layer plaster (up to 20 mm), medium (13 × 15) is advised to buy when strengthening coatings up to 5 cm thick, including loaded ones, large (22 × 35) - when working with large surfaces and uneven facades. This group includes many subspecies and brands: Plurima (based on polypropylene with high chemical inertness), Sintoflex (heavy-duty and geometrically stable brand), STREN (recommended for use under the influence of aggressive environments), Armaflex (reinforcing any type of masonry, including uneven). The cost per square meter depends on the quality, chemical inertness and strength of the plastic and varies from 11 to 110 rubles.
What grid to use and in what cases?
The main determining criterion is the thickness of the applied solution; when working indoors, a reliable base and thin-layer alignment (up to 20 mm), it can be abandoned. When facing facades, reinforcement is always carried out: a metal mesh-reinforcement for plaster is selected when the wall level deviates more than 30 mm, while with significant risks of destruction of the base or shrinkage of the building, it must be welded. In other cases, fiberglass or plastic with a density in the range of 160-300 g / m2 is sufficient to close the standard masonry. Smooth foam plates that insulate the facade are advised to finish on light fiberglass.
It is better not to save on external surfaces; these areas require varieties coated with zinc or impregnated with alkali-resistant compounds. To eliminate doubts, the material is checked by immersion in a soapy solution for several days, high-quality products do not spread and do not change color. When buying facade meshes, attention is paid to the value of the breaking load. On flat areas, a canvas with 1800 N and above is used, on curved areas - within 1300-1500.
When finishing the interior, the same rules apply - a thick-layer coating requires reinforcement with metal, a thin-layer one - with fiberglass or polypropylene. The latter type is also used as a masonry one: an elastic web with 5 × 5 cells is placed between bricks or blocks and increases the adhesion of rows and products. The recommended density range for synthetic meshes for internal plaster is 110-160 g/m2, which is enough to ensure crack resistance and keep the layer within 2-3 cm. adjoining the ceiling, reinforcing mastic roofs, serpyanka is well suited - a thin fiberglass with a cell size of 2 × 2 mm and a density in the range of 45-60 g / m2.
Do-it-yourself grid mounting nuances
The metal variety weighs the most and needs to be securely fixed with screws or nails. It is degreased (galvanized is simply washed with water or wiped with a rag) and cut with special scissors into pieces of the desired size, taking into account the obligatory entry into neighboring areas by 10 cm. In some cases, holes for dowels are prepared in advance, the step is 25-30 cm, on average m2 takes 16 fasteners. The edges, if possible, are fixed with a mounting tape (when working with coarse-mesh options, its use is mandatory).
It is better to finish metal-reinforced surfaces in two layers (not counting the spray), the second, thinner and leveling one is applied after the first has dried slightly. This view must be securely closed with a mixture, it is important to choose the correct cross section and method of connecting the wire, it is impossible to reduce the coating thickness below the recommended value.
When working with fiberglass and polypropylene meshes for plaster, the mortar itself or self-tapping screws and screws can act as fixing materials. In the first case, the canvas is placed in the middle of two layers; to increase the density, it is better to unwind it directly on the spot, and not cut it into separate pieces (the exception is the foam plastic finish, where segments are better suited). Plastered in the direction from the middle to the edges.
In the process, it is important to avoid the formation of air bubbles and avoid stretching the plastic mesh.
But a more reliable and correct option is to fix the dowels on a still dry wall, followed by spraying and applying the first layer as a base. The number of fasteners is minimal (one per canvas with a uniform step of 1-2 m), with a significant level difference, they are used for mounting beacons. The first layer of the solution is placed along the width of the product, after laying it, they proceed to the next one, tracking the approach to each other by 10-15 cm. Plastering for the purpose of leveling should also be done from the middle to the edge. Avoid sudden movements with a spatula, especially when working with facade meshes, otherwise they depart along with the finishing composition. The correctness is checked visually - if they are visible under the leveling layer, then it is better to increase it by 1-2 mm.
Material cost
| Name, basis | Special properties, brief description | Cell size, mm | Roll size, m | Price for 1 m2, rubles | Price per roll, rubles |
| Stucco Woven Galvanized Wire Mesh | Wire diameter - 0.25 mm | 0.63×0.63 | 1×30 | 468 | 14040 |
| 1×1 | 208 | 6240 | |||
| The same - 0.4 | 2×2 | 162,50 | 4880 | ||
| 4×4 | 143 | 4290 | |||
| The same - 0.6 | 10x10 | 1×60 | 65 | 3900 | |
| 15×15 | 1×80 | 62 | 4990 | ||
| The chain-link is not galvanized | Wire diameter - 1.2 mm | 6×6 | 1×10 | 240 | 2400 |
| Welded galvanized | Wire diameter - 1 mm | 10x10 | 1×25 | 240 | 6000 |
| fiberglass mesh | Serpyanka with a density of 45 g/m2, white | 2×2 | 1×50 | 18 | 900 |
| Plaster impregnated with alkali-resistant polymer composition, 60 g/m2, white | 5×5 | 21 | 1050 | ||
| For facade, 160 g/m2, blue | 31 | 1550 | |||
| Plastic mesh Wagon S | Colors: khaki, black. Used for finishing and rough layers up to 1 cm thick | 6×6 | 2×100 | 14 | 2800 |
| Synthflex E | High-strength, flexible, biaxially oriented polypropylene, for reinforcing layers up to 5 cm | 12×14 | 65 | 13000 | |
| C1-3, polypropylene | Grey, for reinforcing plaster (up to 2 cm) and masonry | 13×13 | 1×30 | 21 | 630 |
Currently, plaster is ranked among the most popular finishing materials for interior surfaces of ceilings and walls.
The technology has stepped far forward, and not so long ago, shingles for plaster were used to strengthen the surface of the walls. Now reinforced construction mesh for plaster is widely used.
1 Application features and types
The plaster mesh is used to securely mount this same plaster on the wall, its thickness can be different. The presented wall finishing technology implies the use of those products that have a certificate of conformity.
As a rule, their typical size and aspect ratio is 10 × 10 mm. Such a grid, having dimensions of 10 × 10 mm, can be mounted on the inner surfaces of the walls quite simply and without much difficulty. A mesh for plaster, which has an appropriate certificate of quality or conformity, is used to fasten or reinforce walls from the inside of a building.
In this case, the thickness of the internal walls is not critical, but mesh for plaster performs its fastening function. In most cases, the plaster mesh has dimensions of 10x10 mm. Before you start its operation, you must make sure that there is such an accompanying document as a quality certificate.
The thickness of the product may vary slightly within acceptable limits. Such a product, used for plastering on the wall, must have a certificate.
This certificate confirms the full compliance of the product with all norms and requirements. It should indicate the thickness and dimensions(for example, 10×10 mm). Such products can be made using polyurethane or metal, and you need to fix it to the wall after reading all the relevant instructions.
In this and similar cases, the thickness of the walls does not affect the quality and pace of the work performed. Fastening of a product with dimensions of 10 × 10 is carried out using special adhesives, self-tapping screws, screws, as well as other devices, the use of which is allowed by the certificate.
The thickness of the products, in this case, must correspond to the technological conditions. For the most part, the mesh is sold in the form of rolls and can have different sizes, the most common among them is 10 × 10 mm.
When buying, be sure to pay attention to the quality certificate. Depending on the method of applying plaster to the surface of the walls, fastening of metal or analogues can be carried out with an orientation towards different methods of implementation.
The certificate of metal products may differ from the same document related to plastic products.
That layer of plaster on the wall, which is called the bottom layer, is reinforced with the participation of the selected mesh product immediately on top of the already applied mortar. The applied solution should have the desired thickness and slightly press the mesh. The certificate reflects all these production points in their respective points.
The most acceptable option during which the last decorative layer will be applied, it will be the one during which the reinforcement will be attached to the wiped and dry surface with the help of special devices.
The certificate allows the use of such technologies. In the event that the surface of the walls being processed does not have a large area, the plaster mortar itself can act as a fastener to the wall.
At the same time, it should be applied to the treated surface of the walls in a dotted manner - this will contribute to the reliable fixing of the grid.
After completion of this action, the entire thickness of the plaster layer is spread evenly over the entire surface area. Currently, there are a number of types of products presented, among them it should be noted:
- universal (small);
- universal average;
- universal large;
- fiberglass;
- mesh plurima;
- armaflex;
- synthoflex;
- steel;
- galvanized.
The presented types of products are distinguished by a wide range of functionality and exhibit a high degree of resistance to high temperatures and harmful chemical effects.
Some of the presented species are characterized by their chemical inertness and Can be used for both outdoor and indoor finishing works. These products are distinguished by the presence of artificially reinforced nodes and are used in areas where they are under increased load.
2 What is the best grid to use?
When choosing the presented products, the primary parameter is the value of its thickness. Before work is carried out, the lowest point located on the ceiling is located, and then it is marked using a laser or building level.
After carrying out such manipulations, it will be possible to assess the maximum thickness of the plaster layer, which will subsequently be formed. After a certain result is obtained, a series of certain actions are performed.
In that case when the plaster thickness parameter will not exceed the value, equal to 20 millimeters, provided that there are no rusts at the ceiling base, it is possible to apply a plaster layer.
After that, you can proceed to the installation of beacons. If the presence of rusts is observed on the ceiling, or the leading layer has a thickness of 20-30 millimeters, it would be most rational to use a mesh product made using fiberglass.
This is due to the fact that the main purpose of the presented meshes is to protect the entire surface from cracking.
If the layer will have a thickness equal to 30 millimeters, then apply.
It will be able to prevent peeling under the influence of its own weight with a high degree of efficiency.
If the ceiling is uneven, and the height differences are more than 50 millimeters, then the plaster will need to be abandoned altogether.
2.1 Technical details of installation and application
When buying such a product, you need to take into account the fact that the cell size should be slightly larger than 5 × 5 millimeters, with a density value from 110 to 160 g / m².
The presented material in most cases should have such a quality as resistance to the harmful effects of alkalis. At the same time, the indicator of the minimum thickness of the plaster layer when using a mesh made using fiberglass should be 3 millimeters, with a maximum value of 30 millimeters.
Before starting work, the product must be trimmed in compliance with the proportions and dimensions of the canvas itself. The value of the web size will directly depend on the location of the grid. It can be longitudinal or transverse.
If there is rust on the ceiling, then the grid is located there in one solid canvas with an orientation to the location of each of the seams. In the event that rustication is absent, there will be no requirements for a special arrangement of products.
It is enough that during the performance of work the entire working surface will be evenly covered with a grid.
Trimming is best done with a margin of 10-15 centimeters in order to strengthen the existing seams located between the walls and the ceiling. At the beginning of the work being done, the entire surface is covered with the very first putty layer. On top of it, a plaster mesh is applied and slightly pressed.
Next, the second layer is applied. According to the regulations, such an operation can be carried out in one go. Or you can wait until the intermediate layer dries. The fiberglass mesh is designed to be attached to the wall with screws or staples, the plaster will lie on top.
The presented method is applicable when it is planned to create a thin plaster layer. Then the product will be located right in the middle of the plaster layer.
If the layer thickness exceeds 10 millimeters, then the mesh can slide to the edge, while reinforcing not the plaster, but only its surface. The initial working stages are carried out taking into account the following algorithm.