Insulation for facade plastering - 2 best options + installation instructions

In our review, we will tell you about the technology of facade insulation with mineral wool and foam. Materials have optimal characteristics that determine their successful use as insulation elements of the facade. Let's note the key advantages of mineral wool and foam.

Insulation for facade plastering - 2 best options + installation instructions

Insulation for facade plastering

Advantages of facade insulation with foam and mineral wool

Insulation for facade plastering - 2 best options + installation instructions

Mineral wool

Insulation for facade plastering - 2 best options + installation instructions

Polyfoam

Ideal for insulating facades of wooden houses. Here, mineral wool even surpasses foam in its characteristics, according to experts, since it allows air to pass through better.

The wooden structure will retain its durability precisely when insulated with mineral wool, which supports air exchange.

The material has high thermal insulation characteristics. It is ideal for insulating facades, as well as loggias with balconies, foundations and attics. It is widely used in modern construction, despite the production of more modern materials.
Mineral wool is able to withstand extremely high temperatures.

This is important when insulating the facades of bath complexes.

Craftsmen are more willing to work with foam. It has a transparent installation algorithm, allows you to work in a short time, with the highest quality.
When the installation of an insulating layer is expected to achieve excellent performance in terms of sound insulation, the best option is to use mineral wool. It surpasses foam in terms of sound insulation parameters.

As an insulating material, foam plastic attracts with its high wear resistance. It can withstand sharp temperature changes, negative environmental influences, while maintaining its original technical parameters. Thanks to this, a layer of plaster, correctly applied to the foam insulation surface, will look perfect even after several seasons of use in difficult climatic conditions.
Mineral wool is not as dense as foam. It is able to pass moisture, ensure its evaporation, and has convection properties.

In this regard, many specialists, builders and ordinary consumers - homeowners consider mineral wool to be more environmentally friendly than polystyrene.

Master builders note that when insulating the walls of bath complexes, saunas and buildings made of natural wood, foam plastic is inferior in terms of environmental friendliness to mineral wool. Polyfoam is not able to provide convection, it does not allow the insulated surface to "breathe", does not support good air exchange.

We gave a table, considered the advantages of both materials as an insulation layer for the facade, and made some comparisons.

Important! One conclusion can be drawn: when insulating the walls of buildings made of natural wood, mineral wool is of greater interest.

Due to its ability to maintain air exchange and moisture evaporation, it is ahead of the foam. At the same time, it is with polystyrene that the installation of insulation can be performed efficiently, as quickly as possible, with minimal time costs.

Insulation for facade plastering - 2 best options + installation instructions

Table - technical characteristics of mineral wool

Insulation for facade plastering - 2 best options + installation instructions

Roll sizes

Insulation for facade plastering - 2 best options + installation instructions

Sizes of slabs

In general, it can be noted that both materials have good performance, they are modern insulation materials, popular and in demand in the construction market.

Insulation for facade plastering - 2 best options + installation instructions

Polyfoam sheet

Insulation for facade plastering - 2 best options + installation instructions

Table of sizes of expanded polystyrene

Insulation of the facade with foam plastic

It is polymer materials that have become insulation with the longest periods of successful operation in difficult climatic conditions. Studies have been carried out, special tests have confirmed excellent results: the foam does not lose its original technical characteristics even under conditions that simulate 80 cycles of temperature change.

What are the unique performance characteristics of the foam? After all, almost all builders know: foamed-type heaters cannot boast of serious resistance to external influences. They do not tolerate the influence of ultraviolet rays, they can dry out quickly enough, lose their original structure and even completely collapse. But the facade of the building is just under the direct influence of ultraviolet rays.

Insulation for facade plastering - 2 best options + installation instructions

Thermal insulation of facades with foam

It turns out that the main secret of the effectiveness and practicality of foam as a heater is its combination with a layer of plaster. The material must be plastered in full accordance with the technological principles.

Then he will acquire excellent performance.

  1. A layer of plaster will protect the foam from the negative effects of moisture. The insulation itself dries for a long time, and with prolonged exposure to a humid environment it becomes too fragile, completely losing its operational properties. Plaster completely eliminates this negative factor, turning the foam into a durable insulation that is resistant to weathering.
  2. Polyfoam is a rather fragile material.

    A layer of plaster prevents the formation of dents, scratches, cracks and other damage to the insulation layer. Together with plaster, the foam is already reliably protected from mechanical influences.

  3. When plastering foam, the level of fire safety of the object increases. Foam insulation ignites by itself, and plaster prevents the spread of fire. However, the builders point out that the professionalism of the plasterer will matter here: the layer should be even, solid, and have sufficient thickness.

  4. Exposure to the sun's rays is detrimental to polystyrene, since ultraviolet light destroys it, makes it brittle. But the option of foam + plaster completely solves this problem.

Obviously, when plastering an insulating foam layer, builders are primarily guided not by aesthetic, but by practical goals. The combination of foam with plaster significantly improves the performance properties of the latter.

Insulation for facade plastering - 2 best options + installation instructions

Wall insulation with foam plastic outside

Insulation for facade plastering - 2 best options + installation instructions

Plastered foam

Insulation for facade plastering - 2 best options + installation instructions

Perfectly plastered on foam plastic facade

Prices for foam

Polyfoam

Step-by-step instructions: we insulate the facade under plaster with foam plastic

It's time to consider the step-by-step instructions, in accordance with which you can qualitatively insulate the facade of the building under plaster using foam plastic.

The work includes the selection and collection of all necessary materials and tools. First of all, you will need to level the base for further insulation, make a mortar and fix the reinforcing mesh, and also perform high-quality grouting, priming and leveling of the plaster layer. Already at the final stage, the walls can be decorated with a decorative coating.

Here is an analysis of the stages of work on the insulation of the walls of the facade on the plaster. We will consider the nuances of the process, tell you about the materials and give useful advice from master builders.

Step 1. Prepare materials, tools

It is important to prepare everything you need in advance. The following materials are required:

  • decorative plaster for aesthetic facade finishing;
  • primer;
  • plaster mixture.

Insulation for facade plastering - 2 best options + installation instructions

Prepare everything you need

Also need a set of tools:

  • preparation container mortar;
  • trowel for plaster;
  • spatula;
  • reinforcing mesh;
  • trowel;
  • sandpaper for grinding;
  • drill with mixer;
  • level.

Prices for building levels

Building levels

Among modern building materials, you can find special plaster compositions that were designed specifically to work with foamed insulation.

The end result, durability and thermal insulation characteristics of the insulation layer largely depend on the quality of the plaster. Plaster mixes are mineral and acrylic.

Pay attention! Mineral plaster is more democratic in terms of cost, affordable, but professional masters always advise acrylic compositions, since their characteristics are much higher, fully justify the cost.

Insulation for facade plastering - 2 best options + installation instructions

Mineral plaster

Mineral-type plasters are made from sand with cement. In the first period, the material copes with its tasks with dignity, but the total period of successful operation is short and is about 2-3 years.

After this time, it is already possible to expect a violation of the integrity of the plaster layer, the appearance of cracks.

Insulation for facade plastering - 2 best options + installation instructions

Thanks to the cement in its composition, this plaster is the most durable among all types of this material

Insulation for facade plastering - 2 best options + installation instructions

Decorating the facade of the house with plaster

Acrylic plasters are more expensive than mineral plasters, but their cost pays off completely due to the long service life. One drawback can be distinguished: under the influence of ultraviolet rays, acrylic gradually loses its saturation tone. But the mixture has many advantages:

  • decorative coating, that is, additional aesthetic processing is no longer needed;
  • excellent protective, adhesive characteristics;
  • ample opportunities for the implementation of interesting design solutions: textured finish "rain", "bark beetle" or "lamb";
  • a good range of shades.

Craftsmen prefer acrylic.

Insulation for facade plastering - 2 best options + installation instructions

Acrylic plaster

Insulation for facade plastering - 2 best options + installation instructions

Acrylic textured plaster

Insulation for facade plastering - 2 best options + installation instructions

Acrylic plaster is usually sold ready-made

Step 2. Level the surface and fix the foam

Now we need to start leveling the walls. This is the first stage of direct work, very important. The overall quality of the insulation layer and installation work will depend on the evenness of the walls. Polyfoam is mounted with plates, and the joints between them must be strictly at the same level.

Otherwise, thermal insulation will not work. The evenness of the foam panels relative to each other is checked quickly: they are carried out with a wide spatula or with a rule.

Insulation for facade plastering - 2 best options + installation instructions

Installing the base / plinth profile

Insulation for facade plastering - 2 best options + installation instructions

Base / plinth strip for foam

Insulation for facade plastering - 2 best options + installation instructions

Option for fastening the corners of the profile - at 45 degrees, using a plate and screws

Insulation for facade plastering - 2 best options + installation instructions

Install the beacon. We will rest on it a sheet of foam

Insulation for facade plastering - 2 best options + installation instructions

Apply a thin layer of glue

Insulation for facade plastering - 2 best options + installation instructions on the primed wall

Scheme of applying glue to the sheet

Insulation for facade plastering - 2 best options + installation instructions

The sheet is installed on the profile and pressed against the beacon

Insulation for facade plastering - 2 best options + installation instructions

We pull the cord to control the plane

Insulation for facade plastering - 2 best options + installation instructions

Align the row by tapping the sheets with the rule. We check that the gap is the same

Insulation for facade plastering - 2 best options + installation instructions

Set the second row to the first

Insulation for facade plastering - 2 best options + installation instructions

It is not recommended to install more than two rows at a time - you need to wait for the glue to set

Insulation for facade plastering - 2 best options + installation instructions

Check the board level

Insulation for facade plastering - 2 best options + installation instructions

Sheets are staggered

Seams between foam blocks must be ideally sealed.

All excess foam is removed. The base is thoroughly cleaned after leveling.

Insulation for facade plastering - 2 best options + installation instructions

After the glue dries, install plastic dowels.To do this, we drill holes with a puncher

Insulation for facade plastering - 2 best options + installation instructions

Insert and hammer in the dowels

Insulation for facade plastering - 2 best options + installation instructions

Fixing the sheet with a dowel

Insulation for facade plastering - 2 best options + installation instructions

Dowelling pattern

Insulation for facade plastering - 2 best options + installation instructions

Plates are fixed dowels

Important! The rough surface should be perfectly leveled. In the process of plastering, it is extremely difficult to hide defects, almost impossible.

In addition, the unevenness of the surface of the foam plates will lead to a loss of the thermal insulation properties of the insulation layer.

Remember the advice! Expanded polystyrene is a fairly smooth material, its adhesion is low. This makes it difficult to glue the surface. The optimal solution is to quickly increase adhesion by making many small pores on the surface. You just need to gently walk over the insulation with a needle roller.

The glue will penetrate perfectly into the smallest pores.

Step 3. Preparing the mortar

It is advisable to use ready-made building mixtures designed specifically for plastering foam. Craftsmen highly appreciate products from Ceresit, Ecomix. It is common practice to use one mixture at a construction site.

Insulation for facade plastering - 2 best options + installation instructions

Mesh adhesive

Ceresit adhesive prices

Adhesive Ceresit

A good solution is to find the most suitable two-in-one composition: a universal adhesive plaster can be used to fix foam boards to the facade, as well as to create a protective surface. Separate compositions are also presented on the market: one mixture is prepared for fastening, and another for plastering.

It is important to correctly calculate the amount of required building mixtures. If we talk about one square meter of the surface of the reinforcing mesh, then 6 kg will be spent on leveling, and 4 kg on plastering.

Mix the solution in full accordance with the recommendations in the instructions.

The only advice: experienced craftsmen believe that the solution can be made a little more liquid, then it will have increased penetrating abilities, it will saturate the insulation well.

Insulation for facade plastering - 2 best options + installation instructions

Mixing the glue

Step 4. Install the plaster mesh

First, the mesh must choose the right one. Since we are talking about the insulation of the facade, that is, external work is being carried out, it is advisable to choose the most dense mesh. The denser the mesh, the better the plaster layer will apply to it.

There is a drawback: the corners will be a little more difficult to shape. But masters with experience will cope with this easily, they will just spend a little more time. Look for alkali resistant mesh. Good mesh density for foam insulation is 130-160 g / m2.

Insulation for facade plastering - 2 best options + installation instructions

Reinforcing mesh for foam insulation

Insulation for facade plastering - 2 best options + installation instructions

Facade mesh

Remember! Do not apply the plaster layer to the styrofoam! The plaster will quickly begin to crack and collapse.

Only reinforcement with a mesh ensures the durability of the insulation-protective layer, consisting of foam and plaster.

First you need to strengthen the door, window slopes, as well as the corners of the building. This is done according to this algorithm.

  1. To reinforce the corners, take a mesh with a width of 0.3 m, a length of 1 m.

  2. The mesh is neatly bent in the middle.
  3. The mortar is applied to the facade using a wide spatula. The length is equal to the strip of the net, but the width should be 10 cm more. The strips will overlap, so a margin of 5 cm is left on both sides.
  4. The mesh is carefully applied to the corners and carefully smoothed with a spatula.

    It is necessary to guide the spatula from the center to the edges, from top to bottom. The mesh must be completely immersed in the solution.

Insulation for facade plastering - 2 best options + installation instructions

Reinforcement of corners

There is also an algorithm for fixing the reinforcing material on the walls of the facade, which is followed by all professional builders.

  1. First of all, the mesh is cut. Remember not to make pieces longer than a meter.

  2. Fasten the mesh in small pieces to achieve maximum adhesion. This is important because building mixes dry quickly. The normal size of one fragment is 100 by 90 cm. The craftsmen usually leave another 10 cm for gluing the joints.
  3. The mixture is applied with a spatula, only on one area.

  4. The mesh is applied to the facade and smoothes well.
  5. Watch the amount of solution! If it is not enough, the mixture is not completely immersed in it, you need to add the mixture with a spatula, level again.
  6. You need to work with a gradual sideways displacement, and fix the mesh sections with an overlap.

Insulation for facade plastering - 2 best options + installation instructions

Reinforcing mesh laying

Insulation for facade plastering - 2 best options + installation instructions

Fasten the fabrics with an overlap

Insulation for facade plastering - 2 best options + installation instructions

Photo - mesh gluing

Insulation for facade plastering - 2 best options + installation instructions

Cutting off excess mesh

Step 5. Rubbing the mesh

The reinforcing layer must be rubbed.

To do this, use special plastic floats or emery cloth. Mashing is carried out in a circular motion. If the emery gets wet mortar, it must be replaced.

Very important! Grouting should be carried out only after the building mixtures have completely dried. When it is cloudy outside, it will take at least a day to dry, and in hot weather, mixtures and plaster dry for 2-3 hours.

Insulation for facade plastering - 2 best options + installation instructions

We clean the nodules

Video - How to properly glue the reinforcing mesh on the walls

Step 6. Priming and leveling

The leveling layer is applied in the next step. It is also necessary to prime the surface.

  1. Apply the mixture with a small spatula to a large one.
  2. Then the wall is treated with a solution.

    Movements should be confident, smooth, precise. When you get the best quality grout, you will need much less time and plastering material for leveling. Even two millimeters of plaster is enough.

  3. Follow the joint lines of the leveling layers. They should not go along the joints of the mesh.

    This way you will be able to make inconspicuous seams.

When the surfaces have already been treated with plaster, trowel down.

Tip. Building mixtures must not dry out. The plaster layer is rubbed off after a maximum of three days so that the leveling layer does not have time to dry out.

This makes work faster, easier and more efficient.

Priming must also be done. Professional, responsible craftsmen never miss it. It is the primer that is able to increase the adhesion of the finishing surface and protect it from fungus. Masters recommend using a special primer: it can prevent the surface from getting wet, the formation of mold and mildew.

Apply the primer with a roller. A foam roller or a short nap model will do.

Insulation for facade plastering - 2 best options + installation instructions

Primer application

Deep penetration primer prices

Primer deep penetration

Step 7. We carry out decorative finishing

Remember! Before carrying out decorative finishing, you must wait until the soil is completely dry.

It is necessary to choose special plaster mixes developed for facades.

They are highly resistant to atmospheric and temperature extremes. The characteristics of the plaster determine the additional components, as well as the type of binder. Silicate, acrylic and mineral plasters are presented.

Algorithm for applying a decorative layer of plaster

  1. Prepare a building mineral mixture. If you are using a ready-made acrylic-based compound, it must be mixed well.

    Insulation for facade plastering - 2 best options + installation instructions

    Preparing plaster mortar

  2. Apply a plaster layer. Remember that the layer should not be too thick. The maximum thickness is 4 mm.

    Insulation for facade plastering - 2 best options + installation instructions

    Apply plaster

  3. The next layer of plaster should be applied after the previous one has completely dried.
  4. The next step is grouting.

    When the surface is half dry, you can start mashing. That is, it is important to feel the degree of drying: the plaster is already well fixed, but at the same time it is still easily corrected. Rub the layer using a special grater.

    Insulation for facade plastering - 2 best options + installation instructions

    Plaster grouting

    Insulation for facade plastering - 2 best options + installation instructions

    Grouting process

Remember a few more important points! Atmospheric indicators are of great importance. There should be no strong wind, the maximum air humidity is 70%, and the temperature should be from 5 to 25 degrees.

Insulation for facade plastering - 2 best options + installation instructions

Result of work

We use mineral wool for facade insulation

Mineral wool can withstand high temperatures, has good thermal and sound insulation properties, while ensuring fire safety. In addition, pests are not scary with such a heater, since rats and mice are not interested in this material. Unfortunately, in terms of environmental friendliness, mineral wool is not so good: it can indeed release toxic substances, but in minimal doses.That is why, as a facade insulation, it fulfills its functions quite adequately, since it is located in the open air, under a layer of plaster. This is not about the danger to human health.

Insulation for facade plastering - 2 best options + installation instructions

One of the possible schemes for installing mineral wool on the facade using modern materials

Let's consider the insulation technology step by step.

  1. The first step is to thoroughly clean the entire work surface. It is necessary to achieve complete smoothness, cleanliness of the facade. It is advisable to eliminate all metal elements, since they can begin to rust under the layer of insulation. A layer of old plaster, paint or glue is removed.

  2. Cords designate the boundaries of the insulation surface. They need to be installed around the perimeter. The gap between the insulation layer and the sag must be at least one centimeter.
  3. To fix the layers of mineral wool, it is necessary to install special profiles.

    Insulation for facade plastering - 2 best options + installation instructions

    Starting profile for mineral wool

  4. Using dowels, the strips are fixed along the perimeter of each profile.

    In order for the fasteners to be accurately calibrated, a building level with a level is needed. It is imperative to fix the planks securely.

  5. Then comes the preparation of the adhesive base. You can only use a special glue designed for mineral wool.
  6. The mineral wool itself is processed with glue.

    There should not be too much of it, but the insulation must be soaked well.

  7. Then it remains to fix the layers of mineral wool.

    Insulation for facade plastering - 2 best options + installation instructions

    Basic principles of the correct location of insulation boards

    Insulation for facade plastering - 2 best options + installation instructions

    Facade insulation technology

    Prices for mineral wool

    Mineral wool

  8. Mineral wool is covered with a layer of reinforced mesh. This is necessary to maintain the shape of the insulating layer, the integrity of the entire structure. The cotton wool itself is covered with an adhesive base on top, and a reinforcing mesh is embedded in it.

  9. The reinforcing mesh is covered with an adhesive base from above.

    Insulation for facade plastering - 2 best options + installation instructions

    Mesh fixing

  10. At the final stage, a layer of decorative plaster is applied. It serves not only as a decoration, but as protection against atmospheric and mechanical influences.

    Insulation for facade plastering - 2 best options + installation instructions

    Apply a layer of decorative plaster

    Insulation for facade plastering - 2 best options + installation instructions

    Apply a finishing coat

Remember! It is important to monitor the weather conditions. It is impossible to install an insulation layer at a high air temperature, above 27 degrees.

Air humidity should not be higher than 80 percent. Sometimes the installation of insulation takes several days. In this case, the masters must protect the facade with a thick mesh to protect the insulation from external influences.

Video - Insulation of the facade of the house with mineral wool for plastering and painting

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