Reinforced plaster walls. Wall plastering technology with mesh. Metal for leveling

Carrying out work on plastering surfaces is an important and responsible task. It is imperative to observe the correct technologies that will allow you to securely fix the material on the wall without unnecessary difficulties so that it does not peel off under any circumstances.

A mesh reinforced for plaster is best suited to address this issue, since it can be used to create a special layer that, on the one hand, will improve adhesion to the wall, and on the other hand, it will reliably fasten the material together. This approach is used when performing a large number of construction work, and it has proven itself only from the best side. So it is used everywhere and are always satisfied with the result.

What is a plastering grid?

Reinforcing mesh for wall plastering fully corresponds to its name and is a special product that has small cells that effectively contain the solution so that it does not scatter in different directions and adheres to the wall as tightly as possible.

There are the following types:

• ... masonry mesh, which has cells measuring 5x5 millimeters and is used with brick walls... Manufactured mainly from polymers;
• ... mesh station wagon which can have different sizes cells and are used in all types of work where it is necessary to cover a large area at a time;
• ... fiberglass mesh, which has a cell size of 5x5 millimeters and is highly resistant to any kind of chemical attack, and also easily tolerates high loads that can be detrimental to other materials;
• ... plurim mesh, made of polypropylene and having a lightweight mass, which makes it easy to use without a strong increase in the load on the walls;
• ... armaflex is a polypropylene material with reinforced knots. It is used in those types of work where it is assumed elevated level loads;
• ... syntoflex - has "immunity" to chemical and mechanical stress;
• ... steel mesh - is one of the most durable models, but not suitable for outdoor use due to its low resistance to atmospheric precipitation;
• ... galvanized mesh - is a modification of the previous model. With the help of special processing, it received protection against corrosion, so it is applicable for any purpose, including operation in high humidity conditions.

The range of products is quite large, so you need to know how to choose the right material when buying. The sales assistant will try to sell the product that is beneficial to him, so it is better if the client himself understands the varieties.

How to choose a mesh for plastering work?

Inexperienced users often have a question, what mesh to reinforce the plaster with? Everything here will depend on the current working conditions, since there are not only universal models, but also narrow-profile products suitable for only one purpose. Therefore, you need to first consult with the masters or independently search for the necessary information. Right choice is very important for further operation, so you need to take it seriously.

Fiberglass reinforcement mesh for plastering is one of the best universal models, as it combines almost everything positive traitsthat such material should possess. It is not afraid of corrosion, since it does not contain metal elements, is not sensitive to moisture and temperature extremes, and withstands mechanical stress well. Therefore, many professionals advise purchasing this particular model.

In any case, the reinforcing mesh for wall plastering in its performance should not be inferior to the main material. This is especially true for strength, reliability and durability. The base simply must stand for no less time than finishing material, otherwise all sense in its use is lost.

How to work with mesh reinforcement?

Reinforced plaster mesh must be securely and tightly attached to the wall so that it does not upset the correct balance that will be established at the end of the finish. Its installation is carried out in a phased mode according to the following scheme:

• ... First, the working surface is divided into separate zones, in each of which a certain number of beacons are marked. They can be calculated using a standard formula, the main indicator of which is the squaring of the wall to be treated.
• ... Next, using a drill, holes are drilled and fasteners of the reinforcing mesh for plaster are inserted. They are quite standard screws, but with large diameter caps that will securely hold the mesh and press it against the wall.
• ... Next, a base layer of plaster is applied, without using a mesh.
• ... After that, the mesh is put on the fasteners and tightened as much as possible. But do not overdo it so that the material does not burst from excessive stress.
• ... On top of the installed mesh, finishing work final level. At the same time, the plaster will lay down evenly and adhere without any problems. The main thing is to smooth out the top layer well so that it looks beautiful.

The price of a reinforcing mesh for plaster will depend on the type chosen. Than bigger size cells, the higher the cost of the material, respectively.

In this article, we describe the possible and most popular facade systems (facades). Technologies and rules for installation and insulation. The sequence of laying films and thermal insulation. If you do not know how to insulate the structure of facades and walls, then this article will help you first understand the issue.

Facade system with vinyl siding cladding on timber frame

System Description:

The uprights of the system frame are made of either softwood or steel thermoprofiles.

The space between the frame racks allows the use of lightweight non-combustible heat-insulating plates (Rocklight, Technolight, Park, etc.), thanks to which the facade insulation system not only becomes economical, but also has a minimum wall thickness. OSB-3 performs the function of rigid ties in the frame structure of the building and is the basis for the installation of vinyl siding. To increase the service life of both OSB-3 boards and the facade system as a whole, a superdiffusion membrane is placed between the siding and the solid base. This material removes humid air from the facade and at the same time protects OSB-3 slabs from street moisture that got from under the cladding (rain, dew, fog). From the inside, the system is protected from waterlogging by a vapor barrier membrane, the overlaps of which are glued with a connecting butyl-rubber tape. The gap between the vapor barrier and the inner lining is intended for laying internal communications.

1 Thermal insulation (Basalt thermal insulation)
2 Vapor barrier for pitched roofs and walls
3 Vinyl siding
4 Superdiffusion membrane
5 OSB-3 plates
6 Building frame
7 Counter strip 40-60 mm
8 Internal lining of gypsum board or GVL

Plaster façade system with non-combustible basalt thermal insulation on a stone base

System Description:

The system has a high level of climate stability indoor spaces thanks to the location of the stone wall inside warm circuit... The various textures of the finishing plasters and the possibility of tinting give the system great decorative possibilities. Due to its high vapor permeability, the system is applicable on all substrates. The non-flammable properties of the heat-insulating material allows this system to be used on the facades of buildings for any purpose, including the facades of kindergartens, schools, hospitals, etc. Reinforcement of the base plaster with a special mesh increases impact resistance and reduces the risk of cracks. Maintenance-free service life of the system over 25 years

1 Thermal insulation (Basalt thermal insulation under plaster)
2 Facade paint (of necessity)
3 Decorative plaster
4 Glass cloth mesh
5 Base reinforcement layer
6 Disc-shaped facade anchor
7 Adhesive for thermal insulation boards
8 Quartz primer
9 Hardening primer
10 Outer wall

Plastering facade system with thermal insulation from expanded polystyrene on a stone base

System Description:

The use of polystyrene boards significantly reduces the cost of the plastering system, but due to the flammability and low vapor permeability of polystyrene, it is worth paying close attention when designing fire safety facade and ventilation of internal premises. Non-combustible mineral wool slabs made of basalt thermal insulation are used in the role of fire scatterers of the facade. The base of the system can be load-bearing, self-supporting and curtain walls made of monolithic reinforced concrete of masonry and reinforced masonry (with a density of at least 600 kg / cubic meter). The base plaster layer plays a protective role in relation to external mechanical and weather influences. Reinforcement of this layer with mesh increases impact resistance and reduces the risk of cracking. Structure (figure) topcoat is determined by the size and shape of the granular filler of decorative plaster, the tool used, and the application methods. Maintenance-free service life of the system is more than 25 years.

1 Basalt thermal insulation for plastering
2 Polystyrene PSBS
3 Facade paint (if necessary)
4 Decorative plaster
5 Quartz primer.
6 Glass cloth mesh
7 Base reinforcement layer
8 Disc facade anchor
9 Adhesive for thermal insulation boards
10 Hardening primer
11 Outer wall

Laminated facade system with decorative brick cladding

System Description:

Thanks to the brick cladding, the system has a classic appearance, while the structure is ventilated, which allows it not to overheat in the warm season and does not accumulate condensate in the insulation during the cold season. In multi-storey construction, the system is supported by a floor to ensure structural integrity. To prevent the formation of a continuous cold bridge, thermal liners made of extruded TECHNONICOL XPS expanded polystyrene are inserted into the ceiling during monolithic works. In low-rise construction (up to 9m high), the system can be erected as a supporting element of a building. In this case, the ceilings rest on the inner part of the wall, the outer masonry is erected continuously to the height of the building, and there is no need for a thermal liner system. The thermal insulation material of this system must have good vapor permeability and rigidity. These requirements are met by TEHNOBLOK thermal insulation boards. To prevent the collapse of the outer verst (masonry), it is connected to the inner verst with flexible connections made of basalt plastic. This element additionally supports the insulation in the design position. System service life over 50 years

1 TECHNOBLOCK
2 Extruded polystyrene foam TECHNONICOL XPS
3 Waterproofing cut-off
4 Flexible basalt-plastic ties with a gap fixer
5 Cladding brick
6 Load-bearing / self-supporting part of the walls
7 Support slab with thermal break system
8 Supply and exhaust openings (vertical seams)

Mesh is a roll 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 cannot be done without it. Cell sizes, diameters and bases 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 deformation of the finish. Its installation significantly reduces the effect of mechanical, moisture and temperature influences and increases the quality of adhesion of solutions to bases. Plastering walls on a grid (and other surfaces) is considered mandatory when:

• Outer facade cladding.
• Reinforcement of floor screed.
• Finish smooth tile building materials with poor adhesion, such as foam.
• Strengthening areas with a high risk of plaster crumbling: openings, slopes, joints.
• Thick layer application of mortar (over 2 cm).
• High risk of building shrinkage.

Varieties of meshes, features and applications

The base material should be strong, alkali-resistant, as lightweight and durable as possible, steel, plastic and fiberglass have suitable characteristics. Metal products, depending on the manufacturing method and type of fabric, are divided into thin and flexible woven (with a small wire diameter), braided, welded (the most rigid, recommended for high mobility of the base) 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 mesh for plastering, it is worth choosing a protected type, with a zinc coating, it withstands the alkaline effect of cement better and is less susceptible to corrosion.

Fiberglass fabric is obtained from threads of molten glass, to increase strength, flexibility and resistance to moisture, it is impregnated with alkaline and biological effects special formulations... It is the thinnest, it is advised to choose it when fine finish, 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 purpose of fiberglass is determined by the size of the cells (for internal works it is advised to buy a canvas 2 × 2 m, for facades and external - 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 reinforcing coatings up to 5 cm thick, including loaded, large (22 × 35) - when working with large surfaces and uneven facades. This group includes many subspecies and brands: Plurimu (based on polypropylene with high chemical inertness), Sintoflex (an ultra-strong and geometrically stable brand), STREN (recommended for operation under the influence of aggressive environments), Armaflex (reinforcing any type of masonry, including uneven ones). The cost square meter depends on the quality, chemical inertness and strength of the plastic and varies from 11 to 110 rubles.

Which mesh to use and when?

The main determining criterion is the thickness of the solution applied; when working indoors, a reliable base and thin-layer leveling (up to 20 mm) can be omitted. When facing facades, reinforcement is always carried out: a metal mesh-reinforcement for plaster is selected when the wall level deviates over 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 of 160-300 g / m2 is sufficient to cover standard masonry. Smooth polystyrene plates that insulate the facade are advised to finish with lightweight 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, quality products do not creep or change color. When buying facade meshes, attention is paid to the breaking load value. On flat areas, a canvas with 1800 N and above is used, on curved ones - in the range of 1300-1500.

When decorating interiors, the same rules apply - a thick-layer coating requires reinforcement with metal, a thin-layer coating - with fiberglass or polypropylene. The latter type is also used as masonry: an elastic canvas with 5 × 5 cells is placed between bricks or blocks and increases the adhesion of rows and products. Recommended density range for synthetic mesh under internal plaster is 110-160 g / m2, this is enough to ensure crack resistance and keep the layer within 2-3 cm.For sealing joints of building boards (gypsum board, fiberboard or chipboard), strengthening window openings and areas of abutment to the ceiling, reinforcing mastic roofs is well suited serpyanka - thin fiberglass with a mesh size of 2 × 2 mm and a density in the range of 45-60 g / m2.

The nuances of installing the grid with your own hands

The metal variety weighs the most and needs to be securely fastened with screws or nails. It is degreased (the galvanized coating 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, the holes for the dowels are prepared in advance, the step is 25-30 cm, on average 1 m2 requires 16 fasteners. The edges are, if possible, fixed with mounting tape (when working with large-mesh options, its use is mandatory).

It is better to finish metal-reinforced surfaces in two layers (not counting spraying), the second, thinner and leveling one, is applied after the first has slightly dried. This type must be reliably 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 thickness of the coating less than the recommended value.

When working with fiberglass and polypropylene nets for plastering, the solution itself or screws and screws can act as fixing materials. In the first case, the canvas is placed in the middle of two layers; to increase its density, it is better to unwind it directly on the spot, and not cut it into separate pieces (the exception is the finishing of the foam, where segments are better suited). Plaster from the middle to the edges.

In the process, it is important to eliminate the formation of air bubbles and to avoid stretching the plastic mesh.

But the option with fixing the dowels to a still dry wall, followed by spraying and applying the first layer as a base is considered more reliable and correct. 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 mortar is placed along the width of the product, after laying it, they proceed to the neighboring one, tracing the approach to each other by 10-15 cm. Plastering for the purpose of alignment should also be done from the middle to the edge. Avoid sharp movements with a spatula, especially when working with facade meshes, otherwise they go away with the finishing compound. 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, short description	Cell size, mm	Roll size, m	Price for 1 m2, rubles	Price per roll, rubles
Galvanized Wire Plastering Woven 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	10 × 10	1 × 60	65	3900
		15 × 15	1 × 80	62	4990
Non-galvanized chain-link	Wire diameter - 1.2 mm	6 × 6	1 × 10	240	2400
Welded galvanized	Wire diameter - 1 mm	10 × 10	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 the facade, 160 g / m2, blue			31	1550
Plastic mesh Station wagon S	Colors: khaki, black. Used for finishing and roughing layers up to 1 cm thick	6 × 6	2 × 100	14	2800
Sintflex E	High strength, flexible, biaxially oriented polypropylene, for reinforcing layers up to 5 cm	12 × 14		65	13000
C1-3, polypropylene	Gray, for reinforcing plaster (up to 2 cm) and masonry	13 × 13	1 × 30	21	630

19.04.2014 17:30

In the last few decades, we have such a definition as a European-style apartment renovation. This means that there are some European standards recommended for execution in the process of performing European-quality repairs. One of these norms was wall plastering with reinforcement, that is, plastering surfaces using a reinforcing mesh.

Many believe that plaster reinforcement is used to increase adhesion (adhesion) of surfaces and protect them from cracks. This is true, but only partially. To increase and improve adhesion, special compounds are used, with which a primer is made. Reinforcement of plaster is mainly done to hold the plaster layer together, which prevents it from cracking.

Reinforcing mesh can be metal, plastic and fiberglass. Plaster reinforcing mesh made of metal has large cells with a diameter of more than 4 mm. Metal reinforcing mesh is used when leveling walls with a large amplitude of curvature, when the differences in some cases can reach 4-5 cm.To plaster such curved walls, plaster is applied in a thick layer, which, after drying, often swells and moves away from the surface. Reinforcement avoids this.

Plastic mesh is less durable and can be chemically attacked by cement-sand plaster. Plastic reinforcing mesh has cells of 2-3 mm, mainly used under gypsum plaster when applying a layer of small thickness. Its use is advisable when applying a layer of less than 20 mm, when finishing more or less smooth walls.

Usually a layer of gypsum plaster is not more than 15 mm and is applied in one layer. Reinforcement of plaster on the walls is often done not with a continuous coating, but partially and only in problem areas. However, when plastering ceilings and walls in new buildings, which are still shrinking, reinforcement is done over the entire surface. Painting plastic reinforcing mesh on the walls and ceilings of the new building protects the plaster walls and ceilings from cracks.

According to the observations of European manufacturers of gypsum plaster mix, the use of a reinforcing layer on the walls of new apartments subject to deformation, the risk of cracks throughout the thickness of the entire plaster layer is significantly reduced. Let's consider a concrete example. After the new brick building was put into operation, rough work was carried out in it. The walls and ceiling were plastered plaster mix for construction cement-sand plaster. A paint net was used, in some places even in two layers. Within three years, small cracks appeared in the upper filler layer along the surface of the ceilings and on the walls in several places. Such cracks can be easily repaired.

Today we'll talk about why and when you need plaster reinforcement. For the last decades we have adopted a conditional holding of premises, the so-called "renovation". It allows you to more thoroughly finish surfaces, applying both European standards and modern materials, and be limited only to materials, not paying much attention to the standards of the repair.

European regulations recommend, but do not oblige, the use of mesh reinforcement in difficult cases. These reasons are misinterpreted and passed into the category of legends. It is believed that reinforcing the plaster is necessary to improve its adhesion to the wall and prevent cracking. This is not entirely true. To improve the adhesion of the plaster, it is necessary to thoroughly clean the wall and apply appropriate primers. Reinforcing mesh reduces the visibility of cracks, rather than preventing their formation. Let's take a closer look at this issue.

Reinforcing mesh can be metal and plastic. Fiberglass mesh is also popular as an analogue of plastic. Metallic is used for plastering with strong irregularities and protrusions, sometimes exceeding 4-5 cm. When leveling, there is a thickened layer of plaster, which, after complete drying, can swell and move away. This is especially true when plastering with clay without using filler. To prevent this from happening, reinforcement with a coarse-mesh (more than 4 mm) metal mesh is necessary. It's actually a plaster mesh. Why not plastic? Because plastic is less durable, corroded by aggressive cement-sand plaster and is usually used under gypsum plaster of small thickness. That is, this is a painting grid with a cell of 2-3 mm, which is reasonable to use on the finishing of the wall with putty or plaster with gypsum mixtures on relatively flat walls, with a thickness of plastering less than 20 mm.

In accordance with both our SNiP and European building standards, the thickness of the plaster layer, made with a gypsum mixture, averages 15 mm. Such plaster, in fact, is applied in one layer. When reinforcing, the mesh is embedded in a freshly applied plaster layer to a depth of at least 2/3 of the entire layer without the formation of folds, with an overlap of at least 100 mm (in the places where one structural element adjoins another - at least 200 mm).

Reinforcement of plaster on the surface of the walls in most cases is not continuous, but only at the junction of various finishing surfaces and structural elements... But when applying a plaster layer to the surface or when working in a freshly erected building that has not yet shrunk, it is recommended to reinforce the entire area.

Studies conducted by European manufacturers have established that in the case of using gypsum plaster in new buildings subject to structural deformations, it is possible to reduce the risk of cracks on the surface of the plastered plaster provided that the plaster is applied in the form of a layer of 20 mm thick and reinforced with a plaster mesh. My practical experience confirms these studies. So, when finishing an apartment with an area of \u200b\u200b100 sq. meters on the seventh floor of a nine-story brick new building, immediately after the house was commissioned, the walls and ceilings were reinforced with a plastic paint net. Some of the walls and ceilings, when working with gypsum plaster, were reinforced even in two layers. Plaster and gypsum mixtures were carried out on the cement-sandy plaster remaining after the builders. The walls were being prepared for painting. Within three years after the completion of the renovation, barely visible cracks appeared in the putty layer on the ceilings of all large rooms and on some walls. Such cracks will be easily repaired during the next cosmetic repair, for example, when repainting walls or gluing wallpaper. It is easy to guess that saving on reinforcing mesh during finishing work in a damp, freshly built building would lead to the formation of cracks throughout the thickness of the plaster layer and would force at least redo the putty layer throughout the room.

Plaster mesh. why do you need plaster reinforcement.

Leveling walls with plaster mixes requires preliminary preparation associated with surface treatment and the installation of beacons. Plaster mesh is often used for finishing - metal, plastic or fiberglass. In what cases is plaster reinforcement necessary, and which mesh is suitable for this?

According to European standards, plaster mesh is recommended for use as a reinforcing material. There is an opinion that it is necessary to reinforce the plaster for better adhesion of the solution to the wall surface, or that the use of meshes 100% guarantees the absence of cracks. In fact, the mortar adheres well to the surface if the surface is cleaned and primed. And the use of plaster nets allows you to reduce the number and size of cracks, which are invisible.

On the Ukrainian market among building materials plastic, fiberglass and metal plaster mesh available. The mesh creates the frame of a layer of starting or finishing plaster applied to the wall. It must meet certain requirements. It should be 150-170 g / mcv.

Conventional plastic (painting) mesh is only suitable for gypsum plasters that do not contain cement. The fact is that it is subject to corrosion by alkaline environments. Therefore, it is used for finishing plaster. In other cases, for a small layer of plaster (up to 20 mm), fiberglass nets and nets impregnated with special compounds can be used.

A metal mesh for reinforcing plaster is used in cases where the surface of the wall is so uneven that the drops are 4 or more centimeters. When dry, the thickened layer of plaster behaves unpredictably and may swell and come off. In this case, even preliminary priming of the walls does not help. If cement is a part of the plaster mixture, then it is worth using steel meshes, because in comparison with other materials, metal is most resistant to corrosion by alkaline media.

Reinforcement with metal is also recommended for clay plastering. For clay, it is better to use a large mesh - 50x50 mm. For external plastering of the walls of the first floor, a metal mesh is also used, because this part of the wall is often subjected to mechanical stress.

How to fix plaster mesh to the wall? To do this, you need a dowel-nails with an outer diameter of 6 mm and a self-tapping screw of 4.5 mm. We drill holes for fasteners, cut off a piece of mesh along the wall height. Further, from the bottom up, we fix the mesh with dowel-nails, simultaneously straightening and pulling it. Washers can be used for fixing, but this is costly. Much more profitable than galvanized perforated tape, which is easy to cut. When attaching the mesh to the wall, make sure that it does not lag behind the wall by more than 1 cm and does not sag. An overlap must be done at the docking points.

The company "Metiz-service" produces and sells steel plaster nets of all types: expanded metal mesh (CPVS), welded mesh, as well as mesh netting with small and large mesh. Knitting wire and galvanized punched tape are also on sale.

Reinforcement of plaster (external and internal finishing)

When reinforcing coatings, the mesh is attached with any in a convenient way directly to the surface wall covering... The base can be a wall of concrete blocks, brickwork, wooden surface... the size of the cell and the stiffness of the mesh depends on the thickness of the plaster layer and the reinforced surface.

The plaster mesh is stretched by leveling the walls with plaster if there is no confidence in the strong adhesion of the plaster to the base or the layers exceed 20 mm.

Before stretching under the ceiling, holes are drilled through 20-30 cm. Wooden corks are hammered into them (furniture dowels of a suitable diameter are very good for this). Carnations are hammered into these plugs. Then a piece of mesh is cut to the height of the room. It is hung on the nails with a bend towards the inside of the room, so it will be easier to level it. The nails are bent, and then holes are drilled through the holes in the mesh every 20-30 cm in height and length. Corks are clogged in them and nails are pressed against the wall. Be sure to fix all the edges. If the mesh in places leaves the wall, then additional fastening is made in them. When drilling holes, keep in mind that there may be pipes and wires in the walls. They are usually 10-20 cm from the ceiling or corner. If there are pipe leads on the wall, then it is better not to make holes along the horizontal and vertical axes relative to them.

The amount of mesh corresponds easily based on the area of \u200b\u200bthe surface to be plastered and the width of the mesh. Plugs and nails need about 25 pieces per 1 square meter.

Is plaster reinforcement required? - apartment renovation library.

Given the fact that in Russia it is customary in most cases to produce renovation work for renovation and this type of repair assumes, first of all, its compliance with European standards, in the future we will also point to the building rules adopted, in particular, on the territory of Germany in relation to work on the reinforcement of plaster.

Reinforcement of the inner plaster layer is usually carried out using plaster mesh... Its purpose is to reduce the impact of the underlying base on the finishing layers and to minimize the risk of cracks associated with the mobility of such layers.

Plaster mesh does not apply to increase the adhesion strength of the plaster layer to the base. To do this, use special solutions such as "Betokontakt" (see also materials for finishing work).

The use of such a mesh is not expressly provided for by the current Russian building regulations. In turn, European standards, although they do not prescribe reinforcement of the plaster layer without fail, indicate that the use of plaster mesh is possible in the case when it becomes necessary to reduce the risk of cracks in the plaster layer. At the same time, the reinforcement of the plaster layer, within the meaning of European building standards, cannot serve as a means to prevent the formation of cracks caused by the influence of structural processes (for example, deflection of floors, shrinkage, creep load-bearing structures or their deformation caused by temperature differences) (see DIN V 18550 item 4.3, paragraph 2 and item 6.3).

Reinforcement of surface finishing layers allows, among other things, to reduce visibility cracks, which, due to various kinds of processes, appear in the underlying layers.

In accordance with the thickness of the plaster layer, made with a gypsum mixture, on average 15 mm (which corresponds to European building regulations). Such plaster is applied in one layer... In the case of reinforcement of the plaster layer, the mesh is established (recessed) into a freshly applied and leveled plaster solution to a height of at least 2/3 of the entire plaster layer (for example, to a height of at least 10 mm with a total thickness of the plaster layer of 15 mm) without wrinkling and is covered even before the crust forms on the surface of the main layer the next layer of plaster, having a height of no more than 1/3 of the total layer thickness (technology of applying "wet layer on a wet base" or "wet on wet") - thus virtually all plastering work is performed in one layer.

Plaster mesh is laid with an overlap not less than 100 mm (in the places where one structural element adjoins another - not less than 200 mm).

Reinforcement of plaster on the surface of the walls in most cases is not continuous, but only at the interface of various finishing surfaces and structural elements. When applying a plaster layer to the ceiling surface, it is recommended to reinforce the entire area of \u200b\u200bsuch a layer.

When facing the surface of the walls with tiles, the reinforcement of the plaster layer is not performed. In this case, the thickness of the plaster layer in accordance with European standards is 10 mm versus 15 mm, provided for the subsequent pasting of the surface or covering with paint layers.

Plastering work should be carried out on condition that massive the moisture content of the underlying base is no more than 8% (Russian SNiP) or the residual moisture is no more than 3% (V DIN, Germany).

Our Austrian colleagues at one time carried out detailed research and found that in the case of using gypsum plaster in newly built houses subject to structural deformations (for example, in the form of shrinkage), it is possible to reduce the risk of cracks on the surface of the plaster provided that the plaster is applied in the form of a layer of thickness 20 mm and its reinforcement with plaster mesh.

Currently, there are stacks of actual plaster and painting... The first one has a cell measuring 5 x 5 mm and is used to reinforce the plaster layer. The second has a smaller cell - 2 x 2 mm and is used when applying putty. In addition, the so-called "cobweb" - fiberglass, which is also used to reduce visibility cracks that may form in the underlying layers.

You might find it helpful:

• Stages of repair in the apartment.
• Types of apartment renovation.

Reinforcement of plaster with metal mesh

When plastering walls and ceilings, one has to deal with strong irregularities and protrusions. When leveling, a thickened layer of plaster appears in places, which can swell and come off over time. To avoid this, you need to use reinforcement. It is recommended to take such measures when the thickness of the plaster is more than two centimeters and on strongly surfaces. What materials can you use for this? Usually they use expanded metal, welded and braided metal mesh, with a fine mesh. There are also plastic plaster nets, which are cheaper, but less durable. eroded faster by aggressive plaster. During installation, such a mesh sags and twists, so experience is needed. The metal mesh has a more rigid and, at the same time, elastic structure and is easy to assemble.

For the plaster frame and to prevent the appearance of microcracks during the subsidence of the foundation, galvanized expanded mesh is ideal. Judge for yourself: it is elastic and adheres well to the wall, repeating its geometry, strong and does not have welded seams, protected from corrosion, and has a low weight. Expanded mesh production is waste-free, so it has a low price. It is made by cutting and simultaneously stretching a galvanized sheet of iron into diamond-shaped cells arranged in a checkerboard pattern. This mesh is durable, easy to install and inexpensive.

To attach the mesh to the surface, you will need a dowel-nails, a puncher, knitting wire, beacons and metal scissors. The surface must be cleaned of dirt and grease, primed. It is important that the solution sticks to the wall, otherwise the plaster, along with the mesh, will lag behind, and it will float. We cut off a piece of mesh along the height of the wall and fasten it with dowel-nails from the bottom up. In multi-layer heavy systems, the entire load falls on the dowels and mesh and this must be taken into account when choosing them. It is convenient to fasten the mesh with wide washers or two-centimeter segments of the remaining beacon. You can buy special galvanized mounting tape or punched tape and cut it into pieces of suitable length. Some simply do not hammer in the nails completely and bend them, fixing the mesh. There is also a way to fix the plaster mesh with knitting wire: we do not completely hammer the dowels, we tie the hats with wire in the shape of the letter Z and then we finish. With any method, we do the fastening with a certain step. Somewhere for 1 square meter there are 20-16 dowel-nails. We stretch the mesh well and press it as tightly as possible against the wall, bulges of more than 1 cm are unacceptable. At the joining points, we put the mesh with an overlap. Door corners and window openings need to be additionally secured with pieces of mesh 300x500mm in size. Then we set up beacons.

After that we will plaster the wall. Apply the first layer with a more liquid solution, with sharp movements. This is necessary in order for the solution to adhere well to the wall through the small mesh cells. After that, we leave it to dry. Throw in the second layer with a thicker solution and stretch from bottom to top.

Whether or not to use a reinforcing frame for plaster is up to you. A layer of plaster up to two centimeters does not need to be reinforced. But some argue that even with a layer of five centimeters, no cracks or detachment appeared. However, don't experiment. Often such experiments go badly. The plaster shrinks, the foundation sinks. and the walls are cracking. And the reinforcement gives the surface elasticity and mechanical strength. Subject to all technological standards, the reinforced plastered wall is sufficiently protected.