With all the variety of building materials used in the construction of walls, the most popular type of finishing is still plaster. Even if later it is planned to use other Decoration Materials, everyone is trying to do at least rough plaster.
In the 90s, the concept of “European-quality renovation” entered our lives. At the same time, everyone puts their own meaning into it. Some people mean high-quality finishing materials and expensive repairs, others believe that these are, first of all, perfectly smooth surfaces made in accordance with European standards. For, use a mesh for plaster.
However, the standards European countries do not necessarily require the use of reinforcing mesh. It is recommended to use it only in difficult places.
The mesh helps reduce the appearance of cracks, but does not ensure the integrity of the finishing layer.
Advantages when using:
- Applying the solution to the mesh can be done quickly, which makes plastering work easy, even without experience.
- If the mesh is securely fastened to the base, then you can be confident in the durability and strength of the finishing layer.
- The plaster applied to the mesh will, in fact, be monolithic design, which will not be subject to shedding and cracking.
- Grid plaster provides reliable adhesion to walls made of any materials.
What are they?
For various types grounds apply Various types grids:
Masonry
This mesh is made from polymers. The cells in the grid have dimensions of 5*5 mm. It is used for plastering.
It is used not only for plastering works ah, but also finishing works ah with the help. It is made from polyurethane. Several types are available: cell size 6*6 mm is considered small, 13*15 mm is medium and 22*35 is large.
Made from specially treated fiberglass. It is used for both plastering and finishing work. Cell dimensions 5*5 mm. This is the most resistant mesh to chemical influences. In addition, fiberglass tolerates elevated temperatures well.
This type is made of polypropylene. Resistant to aggressive environments. Has a cell size of 5*6 mm. Can be used for plastering internal and external surfaces;
Armaflex
The mesh is made of polypropylene, but additionally has reinforced cell corners. Cell dimensions 12*15 mm. It is used when plastering surfaces with a thick layer.
It consists of steel rods soldered at the corners of the cells. There is a range of steel mesh with different mesh sizes.
Due to its susceptibility to corrosion, it is only suitable for interior work. Just like steel ones, they have various sizes cells.
Galvanized
Unlike metal, it can be used for outdoor work.
Which one to choose?
In order to select the correct mesh, you need to use a level to determine the differences in the base. This will allow you to know approximately how thick the plaster layer will be.
There are several solutions for using a grid:
- If the expected plaster layer is less than 20 mm, it is recommended to use universal mesh. It will do an excellent job of fixing the mortar and preventing the appearance of cracks.
- If the plaster layer is more than 3 mm, a metal mesh is required.
- If the differences are more than 50 m, you should think about it.
How to install?
The installation technology depends on the material from which it is made.
To attach the metal mesh you will need self-tapping screws, dowels, metal scissors and galvanized mounting tape.
All work should be performed in accordance with the instructions:
- Using metal scissors, cut a piece of mesh to fit the wall and degrease it. To do this, you can use any solvent or acetone.
- Using metal scissors, cut the galvanized mounting tape into small pieces.
- The mesh must be installed from top to bottom, placing the canvas horizontally, starting from the ceiling itself. The upper edge of the first row is secured with self-tapping screws. Considering that the metal mesh has large enough cell sizes so that the mesh does not jump off the screws, pieces are placed under their caps mounting tape so that it presses one side of the cell against the wall. There are widened nuts on sale that can also be used for these purposes, however, they are much more expensive than mounting tape.
- If the mesh is installed on concrete or brick wall, then the fastening must be carried out in advance installed dowels. For this you can use regular plastic parts, which are quite inexpensive.
- Fastening must be done often enough in a checkerboard pattern so that the mesh fits tightly to the wall. The ideal distance between dowels is 500 mm.
- The mesh panels are attached over the entire surface of the wall with an overlap of 80-100 mm.
- Fastening plaster mesh made of fiberglass.
This mesh does not need to be attached over the entire surface: it is enough to securely attach it along the upper edge. It is also attached starting from the ceiling. The cell sizes of such a mesh are small, and it itself has little weight, which makes it permissible to use only self-tapping screws, without additional accessories such as mounting tape or nuts.
It is important that there is a piece of mesh left in the corners to create a slight overlap.
The greatest strength can be achieved if the mesh is applied to the wall as a whole panel. Therefore, beacons must be placed along a grid already attached to the wall.
Ceiling mesh reinforcement
Several materials can be used to reinforce ceilings.
Just like for walls, they use a mesh made of fiberglass, metal, as well as shingles - a structure made of wooden slats:
- Plastic or fiberglass mesh It is recommended to use if the expected putty layer is no more than 30 mm.
- For height differences of more than 30 mm, it is better to use a metal mesh. It is much more expensive than plastic, but much stronger.
- Shingles have been used for many years. For its construction, a 20*8 mm rail is used, which is attached to each other in the form of slats. This is the simplest method of reinforcing the plaster layer, but is only suitable for wooden bases, simple design.
Before attaching the mesh, it is necessary to prepare a mounting tape, pre-cut into small pieces with metal scissors. The metal mesh should first be degreased using acetone or other solvents. As a last resort, you can simply wash it with any soap and detergent that can wash away oil or grease traces.
The mesh needs to be cut to the size of the ceiling. It is important to remember that one canvas should overlap the previous one by at least 12-15 cm.
Fastening:
- The shingles are attached very simply: you just need to nail the structure at the tops of the cells to the ceiling.
- Fastening a metal or plastic mesh can be done either with nails or with dowel-nails. They need to be arranged in a checkerboard pattern at a distance of 200-300 mm from each other.
- If you do not use a mounting grid, you can use nails with large heads or use washers.
The use of plaster mesh when sealing joints in floor slabs
To carry out these works, a strip is cut out of the mesh along the width of the area, adding 5-10 cm on each side. It is attached in the usual way and sealed with mortar.
In any case, the application of the solution should be started from the middle of the room, moving evenly towards the walls.
Price
- Metal mesh – 140 rubles per square meter.
- Plastic - 30-40 rubles per square meter.
- Fiberglass mesh - 50-60 rubles per square meter.
The use of reinforcing mesh allows you to make repairs more durable and of higher quality. Subsequently, it will be enough to carry out only redecorating: replacing wallpaper, painting the ceiling.
Plaster on mesh – effective method rough wall finishing. A particular advantage of this method is that it allows you to apply a thick layer of mortar, which during the finishing process will not slide or peel off under its own weight. What is the procedure itself, what types of mesh should be used in certain cases, and how to attach them? More on this later.
When plastering walls without using a reinforcing layer, there is a high risk that the applied solution will simply fall off the base. And when finishing brick and wooden surfaces the plaster may begin to peel and crumble even after repairs have been made. This usually occurs due to insufficient adhesion of the materials indicated above. The mesh allows you to form monolithic slab, which is not afraid of any loads. Different meshes are designed for a specific load, and the type of material used depends on the thickness of the plaster layer.
On a note! With the help of reinforcement, a durable coating is created that will not crack during long-term use. Even if the solution preparation technology is violated, the mesh will ensure the integrity of the plaster layer.
Types of grids
There are several types of products used for reinforcement, the main ones being the following materials:
- fiberglass;
- metal.
Types of reinforcing mesh: a – metal; b – fiberglass When applying a thin layer of mortar to a flat surface, fiberglass sheeting is usually used. For finishing curved walls, when the thickness of the plaster is more than 2 centimeters, only a metal product is suitable.
In its turn, metal mesh There are also several types:
- woven - durable and flexible material, which is made from wire of small cross-section. This product is used for both external and internal work. When choosing woven fabric for reinforcement, it should be taken into account that optimal size the cells in this case are 1x1 cm;
- wicker - also known as chain-link mesh. Best suited for finishing large surfaces. The most common cell size is 2x2 cm;
- welded - made from wire using spot welding. The rods located perpendicular to each other form square cells, the optimal size of which for reinforcement is 2-3 cm. Welded products are most often used for finishing buildings subject to severe shrinkage;
- expanded metal- made from sheet metal by forming diamond-shaped cells on a special machine. Such material is usually installed in cases where a small solution consumption is expected per 1 m2.
How to attach metal mesh?
To work with a metal mesh you will need self-tapping screws, construction dowels and metal mounting tape.
- Before installing the canvas, it is necessary to cut off the required piece, having previously measured the area on which the plaster will be applied in the future. To cut thin material, metal scissors will be enough. If the product is made of wire with a diameter of 2 mm or more, you will need a grinder. The cut fabric must be degreased by wiping it with a rag moistened with a solvent.
- Attaching the mesh under the plaster should begin from the ceiling. The top of the material is secured along its entire length with self-tapping screws, under the heads of which cut pieces of mounting tape are placed. Wide washers can also be used as spacers, but they are much more expensive than tape.
- When installing on a concrete or brick surface, you need to drill holes in the wall and insert plastic dowels into them.
- The distance between the screws depends on the size of the cells and the thickness of the mesh itself. But in any case, it is desirable that the fastening step be no more than 40-50 cm. In places of fixation, the canvas may come into contact with the wall, and in the spaces between fasteners it should not contact the surface, since in this case the quality of the plaster layer will deteriorate.
- At the joints, the material is installed with an overlap of 8-10 cm.
- A properly secured fabric should be well tensioned. If the material does not vibrate in places where there are no fasteners, then everything is in order. Otherwise, voids may form under the mesh, which will negatively affect the quality of the finish.
Installation of fiberglass sheeting
In this case, the plaster mesh is attached to the wall by fixing the material only along the perimeter of the canvas. First, using self-tapping screws, secure the upper edge of the mesh in several places, and then all other sides. Additional fasteners are usually not used, since later, when applying the solution, the mesh is securely fixed in the thickness of the plaster.
Commit fiberglass mesh on the wall it is possible only with a plaster solution; if difficulties arise, you can use self-tapping screws Since the mesh is initially rolled into rolls, for ease of installation it is better to unwind and fasten the material along the walls, parallel to the floor. You need to start fastening from the top, from any corner of the room. The joints are overlapped with an overlap of 15-20 cm.
You should know! It is best to cut the material so that you can stretch the whole fabric. This will ensure higher strength of the plaster layer.
Preparing the wall for plaster and installing beacons
Even when using a mesh, the surface requires preliminary preparation:
- First of all, the wall is freed from old decoration(if any) – paints, plasters, etc.
- Next, dust is removed from the surface. If there is fungus and mold on the wall, the affected areas should be cleaned with a wire brush.
- After this, the surface is treated with a primer, which improves the quality of adhesion, strengthens the base and prevents the formation of mold and corrosion.
After preparing the base and installing the reinforcing sheet, it is necessary to help form a smooth surface during the plastering process. A special profile is used as beacons.
Installation is as follows:
- Using a building level, set the outer profile in a strictly vertical position and secure it with two self-tapping screws.
- Next, the lighthouse is fixed using gypsum mortar.
- The next step is to install a beacon on the other edge of the wall. To mount all profiles in the same plane, a thread is pulled between the outer guides.
- Then the remaining beacons are installed, the distance between which should be less than the length of the rule.
Plastering the surface
After installing the beacons, you can proceed to the plastering process. Plastering walls on a grid is carried out in several stages, at each of which one layer of mortar is applied.
First stage. Plastering is usually carried out in 2 or 3 layers, depending on the material of the walls. The initial layer is applied by “spraying”. To do this, prepare a solution whose consistency should resemble sour cream. Ready mixture throw on with a trowel or ladle in any order. The solution can be spread, but the first option is easier and faster. The applied mixture is leveled with a spatula. The thickness of the “spray” layer should be about 10 mm.
Second phase. After the first layer has completely dried, a thicker mixture of dough-like consistency is kneaded. The solution applied using a trowel is leveled with a rule, which is pressed against the beacons and pulled from the bottom up. This layer should completely cover the reinforcing mesh. After the solution has set, the profiles are pulled out and the remaining furrows are sealed.
Third stage. Final procedure - final alignment frozen surface. To do this, prepare a liquid solution and, applying it to the wall, rub it in a circular motion using a grater.
The above plastering technology is suitable for finishing any surface, regardless of what kind of reinforcing mesh is used.
Currently, plaster is considered one of the most popular finishing materials for interior surfaces of ceilings and walls.
Technology has stepped far forward, and not so long ago, shingles for plaster were used to strengthen the surface of walls. Nowadays, construction reinforced painting mesh for plaster is widely used.
1 Application features and types
The mesh for plaster is used to securely attach this plaster to the wall; its thickness can be different. The presented wall finishing technology involves the use of those products that have a certificate of conformity.
Usually, typical size and their aspect ratio is 10x10 mm. Such a mesh, measuring 10×10 mm, is attached to internal surfaces walls can be done quite simply and without much difficulty. Plastering mesh, 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 interior walls is not decisive, but The mesh for plaster performs its fastening function. In most cases, the mesh for plaster has dimensions of 10x10 mm. Before you start using it, you must make sure that you have an accompanying document such as a quality certificate.
The thickness of the product may vary within small acceptable limits. Such a product is used for plastering on the wall and must have a certificate.
This certificate confirms the product’s full compliance with all standards and requirements. It should indicate the thickness and dimensions(for example 10x10 mm). Such products can be made using polyurethane or metal, and should be attached 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 work performed. Fastening a product with dimensions 10×10 is done using special adhesives, self-tapping screws, screws, as well as other devices, the use of which is permitted 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 10x10 mm.
When purchasing, be sure to pay attention to the quality certificate. Depending on the method of applying plaster to the surface of the walls, fastening metal or analogues can be carried out with an orientation towards different ways implementation.
Certificate 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 must have required thickness and press the mesh lightly. The certificate reflects all these production points in their respective paragraphs.
The most acceptable option during which the last decorative layer will be applied will be the one during which the reinforcement will be attached to the wiped and dry surface using special devices.
The certificate allows the use of such technologies. In the case when the surface of the walls being processed does not have large area, the plaster mortar itself can act as a fastener to the wall.
At the same time, it should be applied to the surface of the walls to be treated in a dotted manner - this will help securely fasten the mesh.
After completing 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;
- plurim mesh;
- armaflex;
- syntoflex;
- steel;
- galvanized.
The presented types of products are distinguished by a wide range of functionality and exhibit a high degree of resistance to exposure high temperatures and harmful chemical exposure.
Some of the presented species are characterized by their chemical inertness and can be used for both external and internal finishing works. These products are distinguished by the presence of artificially reinforced components and are used in areas where they are subject to increased load.
2 Which mesh is best to use?
When choosing the presented products, the primary parameter is the value of its thickness. Before carrying out work, the lowest point located on the ceiling is located, and then its mark is made 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 specific actions are performed.
In the case when the plaster thickness parameter will not exceed the value equal to 20 millimeters, provided there are no rusts at the ceiling base, a plaster layer can be applied.
After this, you can proceed to installing beacons. If there are rusts on the ceiling, or the leading layer is 20-30 millimeters thick, 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 the formation of cracks.
If the layer has a thickness of 30 millimeters, then it should be applied.
It will be able to highly effectively prevent peeling under the influence of its own weight.
If the ceiling is uneven and the height differences are more than 50 millimeters, then plaster will need to be abandoned altogether.
2.1 Technical nuances of installation and application
When purchasing such a product, you need to take into account the fact that the cell size should be slightly larger than 5x5 millimeters, with a density value of 110 to 160 g/m².
In most cases, the presented material must have a quality such as resistance to the harmful effects of alkalis. At the same time, 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 accordance with the proportions and dimensions of the canvas itself. The size of the canvas will directly depend on the location of the grid. It can be longitudinal or transverse.
If there is rust on the ceiling, then the mesh is located there as one solid sheet with orientation to the location of each of the seams. In the case where there are no rustications, there will be no requirements for a special arrangement of products.
It is only enough that when performing work, all working surface will be evenly covered with the mesh.
It is best to trim with a margin of 10-15 centimeters in order to strengthen the existing seams located between the walls and ceiling. At the beginning of the work, the entire surface is covered with the very first putty layer. A plaster mesh is placed on top of it and slightly pressed in.
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, and the plaster will go 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, the mesh may slide to the edge, and not the plaster will be reinforced, but only its surface. The initial working stages are carried out taking into account the following algorithm.
In the construction of buildings and various types of finishing work, the use of metal mesh is becoming increasingly widespread. In order not to make a mistake when choosing a reinforcing metal mesh, you need to understand in advance all the pros and cons of its use. Knowing the characteristics of the types of this material will help you make the right and informed choice.
Peculiarities
Plastering building facades or interior spaces by using decorative compositions- one of the most common and cost-effective finishing options. A wide variety of high-quality mixtures, distinguished by a variety of colors and textures, allows you to be confident in the attractiveness of the tiled surface.
The only drawback is the not very high strength of this finish. To increase its reliability and durability, special reinforcing materials are used. Their use helps prevent the appearance of cracks during inevitable shrinkage or movement of a new structure, improves the adhesive base and plaster mixtures.
Reinforcing structures are made from various materials, as a result of which they acquire specific properties that determine their scope of application. Most often when performing plastering work the following are used:
- polymer;
- plastic;
- fiberglass;
- metal mesh.
The choice of one type or another, first of all, depends on the expected thickness of the plaster layer. You should also pay attention to finishing materials and the composition of mixtures for decorative coatings.
Reinforcing metal mesh
This material is the most universal reinforcing product. Its main functions are to strengthen and protect the plastered surface from mechanical damage. It prevents the possibility of cracking of the plaster layer due to sudden temperature changes. The rough finishing layer is more even and smooth, better prepared for finishing work.
Reinforcement with metal mesh helps to further strengthen structures that are not very strong and reliable.
In the production of this type of building materials, wire or metal rods are used. Depending on their thickness, meshes are divided into the following categories:
- lungs;
- average;
- heavy.
Advantages and disadvantages
Today the range of plaster mesh is very diverse. Constructions made of polyurethane, plastic and fiberglass have become available for use. But the most popular are those made from metals.
This is due to many features of their technical characteristics:
- The metal mesh is particularly durable, which helps it withstand heavy loads. If leveling a large surface area requires applying a thick layer of plaster, then it is better not to save money and purchase just such a material for reinforcement.
- Its use is possible when working on any base and with different compositions of rough finishing solutions.
- The application of the plaster layer is not limited by its thickness. When working with thin or light substrates, it is possible to apply a minimum layer of up to 20 mm. If it is necessary to equalize differences in surface heights on a vertical wall, then it is permissible to apply a solution with a thickness of more than 50 mm.
- In preparation for plastering a metal base, you can weld a reinforcing mesh to it, which will ensure greater reliability of the entire structure.
- To cut out individual pieces of a free configuration from a solid fabric, it is enough to use hand tools, for example, metal cutting scissors or wire cutters.
- Fastening such reinforcement does not require much time and effort. To create a strong connection with the base, it is enough to secure the mesh in only a few places.
The main disadvantage of this type of material is its significant weight. It can be strengthened only on surfaces that can withstand the total weight of the metal mesh and finishing leveling mixtures. You should not perform reinforcement on surfaces made of plasterboard or hollow brick.
Types of reinforcing metal mesh
Reinforcing mesh is used both for plastering and for creating cement screeds or concrete pads. In their production they use metal blanks, the thickness of which depends on the expected load on the lined surface. They also differ in cell size. For plastering work, lighter options are used, the wire thickness of which does not exceed 1.5 mm and with a cell size of up to 30 mm.
The most popular product sizes according to GOST:
- 10x10;
- 25x25 mm.
Manufacturers offer customers rolled and sheet reinforcing mesh. Each of these types is convenient to use in its own way. When carrying out finishing work on long areas, it is better to use rolled reinforcing mesh. This will require additional effort when stretching and fastening, but will significantly improve the quality and appearance finished coating - it will be more even, since the work uses a single piece of canvas, characterized by the absence of seams and overlays.
For artificial stone need to be selected small sizes coverings.
The technology for attaching the mesh differs depending on the base of the surface. It is enough to weld it to the metal using a welding machine. welding work. If the mesh is quite thin, then wooden base it is conveniently fastened with an industrial stapler that shoots large staples.
To secure thicker reinforcement, you will need screws or nails. Reinforcing material can be attached to brick or concrete bases using dowels and washers.
Currently, several types are most widespread on the market:
- welded;
- woven;
- expanded metal all-metal;
- chain-link
Welded
This material is increasingly popular among buyers due to its relatively low price and very High Quality, it can also be used at any stage of construction or finishing. Most often, welded mesh is used for the following types of work:
- strengthening the foundation of the building;
- reinforcement of walls made of bricks and various blocks;
- when performing finishing work on load-bearing surfaces;
- when installing a thermal insulation layer.
Made from metal rods different diameters by welding them. In this case, the distance between them can differ quite significantly. The weight of the mesh is small compared to other types.
Special attention should pay attention to the material from which it is made. It is optimal to use stainless metals and their alloys, since the resulting corrosion leads to premature destruction of structures.
The main disadvantage of this type of plaster fittings is the weakness of the welds - they can cause ruptures and rust. How smaller size cells, the higher the probability of destruction, since there are more of these seams. In addition, the mesh for a long time When stored in rolls, it becomes deformed, which significantly complicates subsequent work.
Woven
This type of metal mesh is universal building material. It is a fabric made of cross-woven wires with same size sections. It is produced on specialized looms from stainless and low-carbon steel, brass and other non-ferrous metals. Can be used in the production of painted steel threads. Cells can be different sizes and shapes, such as square or rectangular.
Stainless woven mesh is widely used in construction., made from the same material. Most often it is used as reinforcement to prevent cracking or sifting bulk materials in the production of mixtures of sand and cement.
Expanded metal mesh
On construction markets it can be found under the name “cutting” or the abbreviation TsPVS. This type of mesh is made from a solid sheet of metal, the thickness of which can reach 2 mm, but most often plates up to 1.5 mm are used. The manufacturing technology involves cutting holes and further stretching the material. As a result, cells are formed that are arranged in a checkerboard pattern. This gives the finished product special strength and flexibility. If one or more cells are deformed, the rest of the web is not subject to further destruction, but it is quite difficult to restore after storage in rolls.
This product is manufactured without the use of plastic protection, which can cause corrosion. The use of galvanized alloys significantly improves the anti-corrosion properties of the material, which is especially important in the aggressive environment of plastering compositions. On finishing stages finishing, no traces of rust appear. The shelf life also increases significantly.
Depending on the base, its weight may vary. Distinctive feature is fire resistance and can be used on any surface. The ability to withstand heavy loads allows it to be used when reinforcing concrete screeds.
The main tasks of the TsPVS:
- protection of the plastered ceiling and walls from mechanical damage and sharp fluctuations air temperature;
- preventing the appearance of cracks due to technological violations during finishing work;
- significant extension of the warranty service life of the plaster.
Chainlink
It is the most commonly used and most popular material among craftsmen around the world. The use of this mesh is not limited to its presence in fences - it is actively used as a reinforcing fabric.
The mesh for plaster is the key to the durability of the work performed. Plastering walls – traditional technology leveling and finishing. And not only - plastering is also performed for the purposes of fire protection and sound insulation, during repairs, as a decorative finishing layer or as preparation for finishing... but most often you need gypsum, cement-sand and lime plaster, just as finishing. The use of mesh for plaster is an important condition.
Reinforcement of products made from cement-sand mortars is a condition for their long service life, and the plaster layer is no exception. In order for the plaster layer to be durable and serve for a long time, it is reinforced by placing inside a mesh made of plastic, fiberglass, steel; there are a lot of types and materials of mesh. And you need to choose a grid based on certain conditions.
Application of plaster mesh
Although the technology is simple - you need to place a mesh approximately in the middle of the solution layer, there are some nuances. Two factors are important - the thickness of the plaster layer and the material of the surface on which it is applied. The most complex cases- this is a thick layer of plaster - more than two centimeters, and a finishing surface that does not have good adhesion to cement - sand solutions, that is, metals, wood, some types of panels. If one or both of these factors are present, then it is important not only to ensure adhesion of the plaster to the wall, the reinforcing mesh must also be firmly fixed. It is not enough to simply lay it in the plaster layer - the result of such work can be a durable layer of plaster that comes off the wall in a single layer.
Fasteners for plaster mesh
The types of fastenings for mesh also depend on the material of the walls - to concrete and brick, although they have good adhesion, the mesh is fastened with dowels, using large washers, to wooden walls- sometimes with nails, but it is better to fasten with self-tapping screws. If you need to plaster metal surface– choose one of the types of steel mesh, and then fix it by welding. The thicker the layer of applied solution is required, the more powerful the mesh is needed; sometimes Chainlink is used. It is clear that thin woven metal mesh is not suitable in this case.
Inexpensive and widespread meshes made of fiberglass and polypropylene are used for plasters that are not extreme. The thickness of the applied layer is 15-20 mm plus the surface material that is combined with plaster solutions- and you can perform work without fasteners.
Preparing the surface for plaster
Preparing the surface for plaster is very important. It doesn’t matter whether the layer is reinforced or not - cleaning, dust removal, removal of all old peeling finishes, as well as treatment with penetrating primers or primers - required condition. Properly prepared surface with good adhesion, flat wall, which does not require a thick layer for leveling - if all these conditions are met, then a thin, strong and elastic mesh should simply be correctly placed in the body of the plaster layer. First, a layer of about 5 mm of mortar is applied to the wall, then the mesh is pressed into it with a wide spatula. The fine-mesh mesh holds up well in the solution. Then this first layer should dry and set. And last, finishing layer, made with the same plaster composition - completely levels the surface.
Brief overview of plaster mesh
There are a lot of plaster meshes, and new ones are appearing, from the most different materials. Gone are the days when there was only one way to strengthen the plaster on the wall and ceiling - wooden shingles. It also happened that they hammered nails and pulled wire over them. But modern expanded metal and woven steel mesh, with or without galvanization, is undoubtedly much stronger and more technologically advanced.
Plastic plaster mesh
They are used not only for plaster, but also for brick and block masonry for the same purpose - reinforcement. The strength of the mesh provides reinforcement to the masonry - the mesh has high tensile strength. Material – polymers, cell size is usually 5*5 mm, release form – rolls. Technological, light in weight, and easy to cut, but at the same time very durable. Suitable for plaster layers with a small thickness - up to 20 mm.
Polyurethane plastering mesh with fine mesh
Universal, suitable for walls and ceilings, for reinforcement thin layers from solutions of any composition. Cell up to 6*6 mm. Meshes with a cell size of up to 15*15 mm are considered medium.
Large polyurethane plaster mesh
Used for mechanized finishing large areas– warehouses, hangars, public facades and industrial buildings etc. mesh 20*20mm, 30*30 mm, 35*35 mm, mesh is available in rolls.
Fiberglass plaster mesh
In terms of strength it has best characteristics, how plastic mesh, withstands significant breaking forces. Another advantage that many types of plastics do not have is that glass fiber is completely chemically inert, and the temperature range of its use is practically unlimited.
Classification of fiberglass plaster mesh
Fiberglass mesh is divided into groups according to density - the higher the density in g/cm2, the stronger the reinforced layer.
For interior plaster Painting and plastering fiberglass mesh is used. The name painting speaks for itself - this type of mesh is the lightest and thinnest, with a density of approximately 45-55 g/cm2. The cell is small - 2*2 mm, 3*3 mm. Plaster mesh for interior decoration have a higher density - up to 180 g/cm2 and a cell from 4 * 4 mm, 5 * 5 mm.
Fiberglass mesh for exterior finishing and facades. Density from 180 to 220 g/cm2, cells 5*5 mm – 10*10 mm.
Fiberglass mesh for plastering on plinth
In addition to the base itself, they are also used for the part covered with soil. And also for plastering underground structures and elements. Very strong and dense mesh, for extreme conditions work and heavy loads, belong to anti-vandal building materials. The price is much higher than for thin meshes. Density up to 300 g/m2, and this is not the limit. The mesh markings indicate the density and tensile strength, as well as the purpose of the mesh.
A feature of fiberglass is its poor resistance to alkaline environments. The main construction finishing mortars are alkaline - they are classified as weak and medium alkali. Therefore, all fiberglass meshes undergo special treatment - impregnation with polyacrylic dispersions. The result is long-term protection. Unprotected fiberglass cement mortar capable of dissolving and “eating” over a period of approximately several months to several years.
Fiberglass mesh is produced both in rolls and in strips of different widths. It is possible to buy them in canvas usually meter width, and even with ready-made fasteners from corners - for reinforcing horizontal and vertical angles. Tapes are used for finishing gypsum board and gypsum fiber board cladding, and for other surfaces made of panels, sheets or blocks, including foam plastics and expanded polystyrene.
Fiberglass mesh is used not only for plastering surfaces and strengthening joints between walls and blocks of windows, doors, ventilation ducts etc. In structural “pies” with heat and waterproofing, as well as for strengthening concrete screeds and self-leveling floors, these meshes have proven to be excellent and are very popular.
Steel mesh for plaster
Many types of metal wire mesh are produced. The cell sizes vary, usually up to 50 mm. Steel mesh is intended not only for reinforcing the plaster layer, but also for strengthening walls. Steel mesh is used very widely - both indoors and outdoors, for reinforcing and decorating surfaces made of reinforced concrete and lightweight concrete, brick and stone.
Metal woven plaster mesh
It is made by weaving from wire, like fabric from threads - twill and linen. The cells are small, from 2*2 mm to 15*15 mm, produced in rolls of a meter or 1.5 meter width. The wire used is galvanized and stainless, less often black.
In terms of strength, woven metal mesh is divided into light, medium and heavy, depending on the thickness of the wire used. The main diameters of the wires are from 0.32 mm to 0.8 mm, less often 1 and 1.2 mm.
Rabitz
They also produce galvanized and colored polymer coatings. They are used not only in the construction of fences, partitions or screens. To strengthen adobe and clay walls under plaster, elastic chain-link with high relief is irreplaceable. The cells hold large volumes of plaster, creating a monolith of reinforcing and finishing layers, and the Chainlink itself is easily attached to the wall surface.
Welded metal mesh for plaster
They are produced black, galvanized and with polymer coatings. Used not only for masonry, concrete screeds and foundations, as well as for strengthening structures with a thick layer of thermal insulation and for finishing surfaces under load.
Can be used for walls made of stone, brick and concrete, as well as for wooden surfaces, with a thick layer of plaster, uneven walls and for loaded surfaces. Welded mesh has a huge range of applications, cells from 5*5 to 100*100 mm, other sizes are possible, wire thickness is usually up to 3 mm. Output – depends on the thickness of the steel, rolls or sheets.
Mesh with galvanization and heat treatment
For plaster it is also produced special type plaster mesh – galvanized and heat treated. The grids are designed to distribute and hold solutions on vertical surfaces without loss. Cells from 10 mm to 100 mm, many standard sizes of meshes with rectangular cells. Output – rolls and sheets, depending on wire diameters.
Expanded-exhaust plaster mesh
Available in both woven and solid metal sheets 0.5 -1.0 mm thick by drawing and perforating the sheet. Widely used, including under plaster, along with welded mesh and a mesh netting. They perform the tasks of holding and adhesion of finishing layers, strengthening them and significantly increasing the resistance to cracking during shrinkage of buildings.
