When you need a grid for plaster. Plaster on metal mesh. How does the finishing process take place?

13.11.2019

When plastering surfaces, a reinforcing mesh is often used. The material allows you to apply a thicker layer of repair composition on the building base. To obtain a satisfactory result, it is recommended to familiarize yourself with the types of mesh, the selection rules and how the walls are plastered with a mesh, and video instructions for the work.

Wall plaster mesh is a material that is used to increase the strength of plaster, as well as prevent cracking, peeling of material and distortion finishing. The mesh improves the adhesion of the building substrate and the repair mortar. The material increases the resistance of the plaster to moisture, temperature changes and mechanical stress.

Do-it-yourself plastering of walls with a grid can be performed for:

facade finishing;
floor screeds;
fixing on the surface of materials with low adhesive properties, which include foam and other heaters;
hardening of surface areas where there is a risk of material peeling - slopes, corners and openings;
applying the product in a thick layer - more than 2 cm;
building shrinkage prevention.

Material types

The grid for walls under plaster has several varieties. To choose a material, it is recommended to familiarize yourself with the characteristics of each.

Polymer mesh

These are plastic nets. Such material is in high demand among finishers. The product is available with cells of different sizes. It is used even for uneven surfaces with large differences. The advantage of the product is an acceptable price.

Metal grid

This network is mainly used for exterior finish. The material has increased strength, it is used even for uneven walls with large differences.

Metal meshes are divided into several types:

Woven mesh is a fine wire product that is highly resistant to mechanical damage and flexibility. It is applied to reinforcing of surfaces in and outside of the room. Professionals advise using a grid with a cell size of 1x1 cm.
Woven mesh. Another name is net-netting. Masters use it to reinforce the construction base of a large area. Cell dimensions are 2x2 cm.
Welded - a mesh that is made of wire by welding. The rods are arranged perpendicular to each other and are welded at the joints. Cell dimensions - 2x2 or 3x3 cm. The material is used if the object shrinks.
Expanded-drawn is a mesh of sheet metal. The material is made by rolling sheets on a special machine. The grid maintains putting plaster with a thick layer. Distinctive feature grids - an increase in the bearing capacity of the object.

fiberglass mesh

Fiberglass mesh for plastering walls is a thin material with small or large cells. The first type is used for interior decoration. The mesh is fixed to the surface without large drops and defects. Usually the material is used for gypsum compositions. A large mesh fiberglass product is used for facades. Such materials can withstand increased stress.

PVC mesh

It is a thin fiber made of polyvinyl chloride. Distinguishing feature - increased stability to the action of chemicals. How to plaster on a PVC mesh is presented in the video tutorials.

What kind of plaster can you use mesh for?

If we talk about what kind of plaster the mesh is used for, then it all depends on the composition of the product and its effect on the material. If the product contains aggressive chemical compounds, then it is recommended to use a PVC mesh. For other materials, gypsum, cement-sand and cement-lime plaster are suitable.

How the grid is fixed

How to lay the plaster mesh depends on what type of material is used for reinforcement.

Installation of fiberglass mesh

Such material is fixed on the repair solution. A layer of plaster is applied to the prepared surface and, without waiting for it to harden, the mesh is laid. From above, a wide spatula is carried out so that the material drowns in the solution.

Before starting work, the mesh is cut into small pieces for ease of fixation. Then they overlap each other.

With the help of self-tapping screws - another option for how to stretch the plaster mesh. The method is relevant if the material is attached to a surface with complex geometry. If the grid is fixed on a wooden construction base, then a construction stapler is used.

Polymer mesh fastening

There are two ways to stretch a plaster mesh made of plastic.

for repair solution. The plaster is applied to the surface in a thin layer, after which a mesh is attached to the material. A wide spatula is used along the surface to drown the product in the solution.
Using self-tapping screws as described above.

Installation of a metal mesh

The mesh for plastering walls made of metal is attached in the following sequence:

cut into small pieces, taking into account the overlaps;
treated with compounds that prevent the occurrence of corrosion;
holes are made in the building base - dowels are fixed in them;
fastening the mesh starts from the upper corners - the material is applied to the surface and screwed with self-tapping screws, screwing the fasteners into the dowels.

The technology of plastering walls on a grid suggests that the gap between the wall and the metal product should be 3-5 mm.

The material is stretched so that there is no sagging (as in the photo below).

Wall preparation

Before plastering walls with mesh, the surface must be prepared: dismantle the old finish, dedust and degrease the surface. Next, the base is primed. The primer is applied twice and after each treatment a break is taken to dry the product. Then the grid is fixed on the surface.

Installation of beacons

After reinforcing the building base, beacons are installed.

Instructions for fixing guides:

via building level install extreme beacons and fix the products with self-tapping screws from above and below;
the fixation of the guides is reinforced with a gypsum solution;
a thread is pulled between the beacons;
the rest of the guides are fixed on the wall at a smaller distance than the dimensions of the rule.

Surface plastering

Grid wall plastering technology:

Knead the solution, the consistency of which resembles liquid sour cream. The product is applied to the surface with a ladle or a narrow spatula. Next, the material is distributed by the rule over the base and a break is taken to dry the solution. Layer thickness - 10 mm.
Knead the solution, the consistency of thick sour cream. The product is applied to the surface with a spatula. After the material has hardened, the guides are removed. The resulting voids are filled with mortar.
Prepare a liquid solution and apply the material to the surface. They take a break in work to dry, after which they clean the surface with sandpaper with a grain of P 100, P 120 or P 150.

The video in this article demonstrates how to plaster a building base with a mesh.

Wall plastering with mesh reinforcement is a finishing stage that allows you to level even a building base with large differences. The main thing is to act in accordance with the technique of using materials.

Tsugunov Anton Valerievich

Reading time: 5 minutes

Leveling various surfaces with ─ one of the popular ways to prepare walls and ceilings for painting or wallpapering. However, plaster does not always lie flat, without defects. Some surfaces have low adhesion, so the solution applied to them begins to crumble and peel off. Especially quickly the destruction of the protective and decorative layer is manifested on the facades of buildings that are exposed to the negative effects of climate and moisture. Using mesh for wall plastering, you can ensure a firm fixation of the mortar with the surface and improve the quality of the finish.

Application

The mesh is used for outdoor and indoor work, and helps to achieve the following results:

Increase durability decorative finishes due to the correct distribution of the load and reducing its impact on 1 m2. The grid is fixed pointwise on the base, and with its help the weight of the solution is kept.
Avoid cracking of the plaster by reinforcing the surface layer. Walls and partitions made of blocks and bricks are prone to shrinkage and deformation. The reinforcing fabric gives the finish plasticity and prevents the appearance of cracks and other defects on the surface.

Mesh types

For the manufacture of the grid, different materials are used, which, along with other parameters, determine its type, characteristics and scope.

Rabitsa. It is made from low-carbon steel wire by weaving and is a canvas with square or diamond-shaped cells and a size of 20 × 20 mm2. To protect against moisture and aggressive substances, the mesh is coated with a layer of zinc or polymer. The chain-link is used to work on surfaces of a large area, including wood or brick.

Welded. It is made from steel wire, which is superimposed at right angles on each other, and then fixed at the joints using spot welding. The result is a strong mesh with cells square shape different size. It is used to strengthen plaster with strong wall shrinkage, which is important for finishing new buildings or houses located on unstable soil.

Cut-and-draw. It is a sheet material with diamond-shaped cells and is intended for reinforcing walls with a small consumption of plaster. Expanded metal is made by cutting holes of the same shape and size into a sheet of metal, which is then stretched and formed into a plaster mesh.

If it is necessary to apply the solution as thinly as possible, it is advisable to use a plastic or fiberglass mesh.

Fiberglass. Indispensable for finishing ceilings, facades and walls in the presence of depressions, grooves and depressions on their surface. It is lightweight, durable and resistant to temperature changes, and can be used for facades. Fiberglass mesh is not susceptible to moisture, so it is used for reinforcing roofs and plastering bathrooms and pools.

polymer mesh. It is produced by extrusion from polymer raw materials, which is most often used as polypropylene. With the help of molding machines, the plastic melt is converted into a mesh fabric, the cell size of which is determined by the modification of the material. The plastic mesh serves to hold plastering works on the surface of facades and internal partitions. Since, over time, a mixture of sand and cement destroys the polymer web, it is advisable to use it for finishing. Grid with cells 2×2 mm2 is indispensable for applying finishing putty.

Mesh laying technology

For finishing work, several types of plaster mixtures are used, which differ in composition, application nuances and the degree of impact on various materials. In addition, when choosing a mesh, you should consider:

the thickness of the applied layer;
base material;
conditions for finishing and operating the coating.

metal

When choosing a metal mesh for reinforcement, it is worth giving preference to galvanized mesh: it prevents corrosion and prevents the appearance of rust spots on the walls. In addition, it is easy to cut and simple enough to fix on the surface. Before work, the metal mesh should be degreased, and the galvanized mesh should be simply rinsed with water. The formation of the reinforcing layer occurs as follows:

Using scissors for metal, the mesh is cut into separate sheets, the size of which depends on the orientation of the material on the surface. In the presence of rusts, a reinforcing layer for plaster is placed along each seam with a solid canvas.
Drill holes with a diameter of 6 mm using a puncher. Their depth should exceed the length of the dowel by 2-3 mm, and the step should be 25-30 cm.
Dowels are inserted into the holes obtained, and then the mesh is fixed to the surface of the walls with mounting tape and screws. For reliable fixation, the canvases are overlapped, overlapping each other by about 10 mm.
Beacons are installed, and the first layer of plaster is thrown using a trowel. In this case, the solution must be pressed in such a way that it passes through the reinforcing fabric and is fixed on the surface. After that, the finishing layer is evenly distributed over the surface of the wall or ceiling.
The second layer of plaster is applied when the first one dries. If the basis is a facade with insulation, then it is advisable to use a chain-link to reinforce the surface. It is also necessary for the decoration of wooden walls.

plastic

If necessary, to protect the plaster from cracking, use plastic mesh. It is especially in demand in those cases of interior decoration, when shrinkage of the base is possible. The algorithm of actions is this.

Mesh for plaster internal walls allows you to perform interior decoration with better quality. This technology prevents the solution from peeling off the surface, makes the coating harder and doubles its service life.

Plaster on the grid - what is it and why is it needed?

Plaster on the grid is one of the ways to finish the walls. This method is needed to strengthen the facing layer on uneven surfaces. Basically, it is used for external surfaces of civil buildings and industrial structures. This is especially true for new, still draft houses. But sometimes rooms are treated in this way. In this case, it is necessary to distinguish between types of reinforcing material for external and internal work.

The cellular material may be fiberglass, polymer or metal. It all depends on where it is applied. To grids under internal plaster present their requirements. Such material must be alkali resistant. For this reason, it is impregnated with a special solution. If this is not done, then over time, cracks will appear on the lining. This means that the base has decomposed, and the plaster layer has lost its strength.

In addition to impregnation, the mesh for plastering interior walls must maintain strength and elasticity. According to SNiP, its density should correspond to the parameters of 150-170 g / m2. This will enable it to withstand the mechanical, wind and other loads experienced by the building as a whole. Usually, builders use a metal mesh to protect the walls of the first floor when performing plastering work.

What is the mesh for plastering interior walls

The plaster layer on concrete, brick and wooden facades cracks and flakes off. To avoid this, the walls are reinforced with mesh. There are 4 types of metal meshes:

Woven mesh is a flexible and incredibly durable material. According to its structure, it consists of a woven wire of different sections. Ideal for DIY wall decoration. Has squares of cells 1x1 cm with zinc coating. Sold in building stores in rolls.
Chain-link or woven mesh is suitable for reinforcing multi-layer plaster. Cell size 2 cm.
Welded mesh with square cells is made by spot welding of intersecting wires located perpendicular to each other. Low-carbon, polymer-coated or galvanized steel wire is used for production. It is intended to prevent cracking of the finishing layer during the period of active wall settlement. To prevent cracks in the plaster, a mesh with 2/3 cm cells is used. It is sold in rolls 1 meter wide.
Expanded mesh is produced by pressing from sheet metal. First, holes are cut through, and then the sheet is stretched to obtain diamond-shaped cells arranged in a checkerboard pattern. Apply under a small layer of solution. Rolls can be of different lengths, but the standard width is 1 meter.

Under a very thin layer, a polymer mesh or fiberglass element is used, most often when needed or, as it is also called, "Venetian". This type of material has increased resistance to various kinds of chemical influences and does not spoil the final coating with spots during operation. Methods for attaching such nets can be different. If the wall is concrete or brick, then you can apply a little mortar on it and press the reinforcing material into it. On wooden or porous surfaces, you can fix the network with a stapler.

Preparation and start of finishing works

Before you start decorating the walls, you need to prepare everything you need: tools, remove debris, think and decide which type of mesh is best to use.

Important: a metal mesh is best suited for applying a mortar with a thickness of 3 cm or more. The chain-link is used when reinforcing walls that have not previously been plastered.

So, after you have prepared everything, you can proceed to the five steps.

Measure the height from floor to ceiling. Spread the mesh and use scissors for metal to cut the required number of panels.
Straighten and attach the mesh to the primed surface with nails or screws. At the same time, do not forget that the canvases should overlap with a width of 10 cm.
Get ready. Add an antiseptic to it so that there is no mold on the plaster in the future.
Throw a preliminary layer of mortar with a trowel, then level it with a rule. Let the fresh plaster set, then apply a leveling coat. Because it is thinner, it should be smeared directly with a trowel. To do this, take a small amount of mixture on the working surface of the tool and, pressing it against the wall, pull it from the bottom up. If the grid is visible, then repeat the procedure.
Let it dry, then cover the bumps with a spatula and rub these places with a grater. After curing, fine-tune the irregularities with fine sandpaper or a sponge moistened with water.

When plastering with the use of polymer types of grids, a solution should be applied from the middle to the edges of the canvas, as if you were sticking wallpaper and expelling air from under them. Networks made of polymeric materials are elastic and stretch. When working with them, you need to be careful and make sure that bubbles do not appear on them. Now, depending on what the plaster was done for, you can either paint it or do it. decorative cladding.

Stucco cladding

Wall painting was the most widespread. Before proceeding with this type of cladding, you need to evaluate the quality of the surface: remove all cracks, make sure that the plaster layer is strong and does not lag behind the wall surface. After the putty has dried, it is necessary to treat the plane before painting with an aqueous primer.

Be careful with the choice of paint, which are going to paint the plaster.

Remember: fresh plaster, as a rule, has an excess of alkali, therefore it is highly undesirable to use compounds containing solvents. Please note that the plaster must be protected with a synthetic primer before applying organic solvent paints.

For painting walls, it is best to use a roller. It is necessary to process the surface carefully, do not leave gaps, and after the coating has dried, it should be painted over again. Acrylic, alkyd and latex compounds are best suited for painting facades.

No less popular is the method of interior decoration with wallpaper. In order for them not to peel off, you need to properly prepare the plastered surface. Remove all old wallpaper material from the walls and make sure the plaster is holding up well. Then the cleaned surface should be washed with water and inspected for cracks. If you find them, then they will need to be puttied and allowed to dry. Then treat such places with fine-grained sandpaper.

The choice of wallpaper glue depends on the type of wallpaper and the surface on which you are going to stick it. Usually on the rolls there is an instruction with recommendations on which glue is best to use. In general, the technique for pasting plastered walls is not much different from the technique for other surfaces.

Out of ignorance of how to do this or that type of repair, you can not only spend a lot of time and effort, but also ruin expensive materials. We hope that the tips given in the article will help you to carry out repairs correctly and avoid many mistakes.

Plaster net increases the strength of the solution when applied to large areas and transitions between different materials walls. Especially needed mesh façade plastering when working in new buildings, the walls of which are still sagging.

The reinforcing material can be metal, polymer or fiberglass. Its choice depends on the application.

What can be plaster mesh

Applied to concrete, brick and wood facades, the plaster cracks and flakes, often later. To prevent this from happening, the walls facade before plaster reinforce grid.

Samples plaster meshes

There are 4 metal types:

Woven mesh. This is a thin, but strong and flexible material, woven by weaving from wire of various sections. woven net , having square cells 1×1 cm and zinc coating. Sold in rolls.

Wicker mesh or netting. Such a material, with a cell diameter of 2 cm, is purchased before strengthening the plaster, when it is supposed to apply significant layers of it.

Welded mesh has square cells. It is produced by spot welding of the intersections of the wires, which are located perpendicular to each other. The material is galvanized or polymer-coated light low-carbon wire. A welded mesh is used to prevent cracking of the plaster during active wall settlement. To prevent cracks in the plaster, a mesh with cells of 2/3 cm is best suited. It is most often sold in rolls, 1 m wide.

Expanded mesh. It is made on a special press from sheets of metal, in which holes are cut, then the sheet is stretched. The resulting material has diamond-shaped cells, which are staggered. Used when relative is assumed. Rolls have a width of 1m, and their length can be different.

If it is planned that the layer will be thin, then plaster walls mesh facade fiberglass or polymer.

Facade plasteringon a grid

Use a metal mesh when applying a plaster layer of 3 cm or more. The chain-link is taken to reinforce with nothing else, that is, with a clean base.

Unroll the mesh roll. Measure the height of the walls from the roof to the ground with a tape measure. Cut the desired number of panels with scissors for metal.
Straighten and fix the mesh with screws or nails on the primed wall. Adjacent canvases should overlap each other by 10 cm.
Knead plaster mortar. To prevent mold from appearing on the plaster in the future, you can add an antiseptic to the mixture.

It is worth noting that almost all conventional ready-made dry mixes already contain such substances.

Plastering walls mesh facade chain link

Throw the first primer layer of the solution with a spatula or trowel, and then level it with a rule. Let the mixture dry and apply a second leveling coat. It is thinner, so spread it with a trowel or a large spatula. The mesh shouldn't stick out, so you may need a third layer as well.

If the plaster does not lie very evenly, then after it has completely dried, you can use the finishing putty. When it hardens, touch up uneven places with fine sandpaper.

Polymer mesh often used when applying textured plasters with your own hands. It is resistant to chemical influences, therefore it does not spoil the finish coating with stains during operation.

Measure with a tape measure and cut the mesh webs. You can fasten it different ways. If the base is dense, then apply a thin layer of mortar to the wall and press the reinforcing material into it. If the walls are porous or wooden, then you can fix the mesh with a stapler.

After fixing it, spread the plaster evenly over its entire surface so that the net does not peek out.

When is produced grid plaster - the technology of working with its polymer types is as follows: start applying the solution from the middle of the canvas and continue moving towards its edges, as if you were gluing wallpaper and driving air out from under them.

Note! Polymer meshes are elastic, so they stretch. Work carefully and do not allow the formation of bubbles from the reinforcement material.

Stucco cladding

The most common method of applying a finish coating, both on plastered external walls buildings, and on the interior - this is their color. Before that, evaluate the quality of the foundation. Repair cracks if necessary. Make sure that the plaster layer has a strong bond with the wall and does not peel off. Next, putty the walls.

After the putty has hardened, sand the surfaces with sandpaper. Before painting the plaster with adhesive paint, treat it with an aqueous primer.

Carefully consider the choice of how to paint the plaster.

Note! If the plaster is fresh, then it may have an excess of alkali, so the use of solvent-based formulations is undesirable. When using organic solvent-based paints, keep in mind that the plaster must be protected beforehand with a synthetic primer.

Facade painting on plaster

Paint the walls with a roller, carefully and without gaps, processing their entire surface. After the first coat of paint has dried, apply the second. Tip on the topic: how to paint the facade plaster. Alkyd, acrylic and latex compounds are best suited for this.

Indoors, the second most popular finish is wallpaper. It is very important to know how to prepare specific surfaces such as plastered walls for them.

First, remove the old wallpaper, if any. Before applying wallpaper to plaster, make sure it adheres well to the walls.

Rinse the cleaned surface with water and inspect for cracks. If they are, cover with putty.

Prepare wallpaper paste. Choosing it before wallpapering the plaster depends on the type of plaster and the type of wallpaper you want to use.

The rolls always have instructions for gluing the material and recommendations for the selection of glue. The technique of working with wallpaper on plastered walls is almost no different from similar operations on other surfaces.

When finishing ceilings and walls, plaster and mesh under plaster are often used.

Plaster may not always lie perfectly on the surface. In order for the plaster layer to fix better, you can use a plaster mesh.

Previously, wooden shingles were used for these purposes (for wooden surfaces), brick was plastered without preparation - its roughness and seams were a sufficient condition for good adhesion of the plaster layer to the wall.

Scope and characteristics

The mesh under the plaster is used to ensure that the plaster layer holds firmly. The fact is that even with a carefully prepared surface for plastering, the solution can sometimes not lie as it should. This can happen if some errors are made during plastering: non-observance of proportions, temperature and humidity levels in the room ...

In order to avoid such errors, it is necessary to use plaster meshes, thanks to which the negative consequences of plastering are significantly minimized. These nets are designed to take on the load that may result from misuse of the space.

Grids are used to reinforce walls before painting (pasting with wallpaper). The mesh gives the plaster the greatest strength, increasing the service life. Especially appreciated is the use of grids for walls with significant defects, when it is necessary to apply plaster in a thick layer.

Before you buy a grid for plaster, you need to choose the one that is suitable for a particular job.

Mesh types

There are a lot of types of mesh for plaster. When choosing the one that is needed for certain work, you need to focus on the features of the type of grid and the size of its cells.

There are different types of mesh:

Masonry grid. It is made from a polymer material. The size of each cell in the grid is 5x5 millimeters. Used for brickwork.

Grids station wagon are made of polyurethane. Used for plastering and finishing works. There are types of station wagon grid: small - cell size 6x6, medium - 13x15 and large - 22x35.

Fiberglass. Manufactured from fiberglass, which is specially processed. Cell size - 5x5 mm. This mesh is particularly durable and resistant to different temperatures and chemical exposure. Has wide application./li>

Plurima. This mesh is made of polypropylene. Cell size - 5x6 mm. Possesses chemical inertness. It is applied to internal and external finishing works.

Armaflex. It is made of polypropylene and has reinforced knots. The cell size is 12x15. It is used when plastering the surface with a thick layer.

Syntoflex. Also made of polypropylene. Cell sizes 12x14 and 22x35. Suitable for interior and exterior decorating.

Steel mesh. The basis of this grid is steel rods, which are soldered at the nodes. A wide range of cell sizes is available.

Metal grid. Cell sizes vary. It is used only for finishing work inside the building.

Galvanized mesh. It is made of galvanized rods, which are soldered in knots. Cell sizes may vary. Differs in the high durability and durability. It is applied to external and internal finishing works.

Which one to choose?

When choosing a plaster mesh, you need to pay attention to what type of work you are going to perform. That is, you need to know the thickness of the layer of future plaster. Namely:

With the required thickness of the plaster layer up to 20 mm, you can not use the grid at all.

In the presence of rustication and the required thickness of the plaster layer is from 20 to 30 mm. The most acceptable would be the use of fiberglass mesh.

With a plaster layer thickness of 30 mm. A metal mesh is required.

If it is necessary to finish an uneven ceiling, in which the height differences are from 50 mm, it is better to abandon plastering altogether, replacing the plaster with a suspended or stretch ceiling. This will make it much easier and cheaper.

Make your choice, and let all the finishing work be done perfectly.