Spraying with polyurethane foam: technology and price. How to make the spraying with polyurethane foam by hand?

The issue of insulation of residential buildings is relevant in almost all regions of Russia. Spraying with polyurethane foam is an effective solution to the problem. This insulation is a two-component composition.

The coefficient of thermal conductivity of the material is very low, it is only 0.021 W / m ² K. The layer of foamed polyurethane foam with a thickness of 0.05 m according to the properties of thermal conductivity corresponds to a brick laying of 1.6 m. In addition, the material is very light. All this explains its wide popularity among builders of different profiles.

Field of application of polyurethane foam

1. Construction of sandwich structures in industrial and civil facilities.

2. Creating a soundproof layer in wagons and aircraft.

3. Thermal insulation by spraying polyurethane foam of external walls, window openings, internal roofing, doors and other structural elements.

4. Insulation of pipelines of cold and hot water supply.

Polyurethane foam is also used in automotive, electrical engineering and many other areas.

Advantages of thermal insulation with polyurethane foam

1. Low coefficient of heat loss in the building.

2. Resistance to negative environmental factors.

3. Excellent long-term adhesion with all kinds of cellular concrete, brick and plasterboard.

4. No need to fasten the thermal insulation fasteners.

5. Polyurethane foam has excellent hydrophobicity.

6. The possibility of a monolithic distribution of the material, that is, without visible seams.

7. Thermal insulation with polyurethane foam by spraying does not require periodic recovery. This greatly saves labor resources.

8. The material consists of cells that allow it to "breathe".

Disadvantages of insulation with polyurethane foam

1. The claimed service life of the material is 15-20 years. But already in the fifth year of operation polyurethane foam can lose up to 30% of thermal insulation properties. This phenomenon is not so noticeable in conditions of constant low temperatures.

2. Equipment for spraying polyurethane foam is quite expensive.

3. The material has a low fire safety.

It can be concluded that the advantages of the material are much greater than the disadvantages.

Technology of spraying with polyurethane foam

Before making insulation by spraying polyurethane foam, you need to prepare the surface to be treated. To do this, clean it from dirt and dry it well. From metals it is important to remove all rust and degrease them. Aluminum requires mandatory primer coating with a high degree of adhesion, this will help increase the adhesion of the insulation to the surface.

An important place in the technological process of sputtering is the ambient temperature and components. To obtain a highly effective layer, it is necessary that the composition be from 10 to 25 ° C. Optimal for the room is the temperature above +5 ° C. Work in a colder environment can only be carried out with a solution warmed to the desired state.

Spraying of polyurethane foam, reviews about which are almost always positive, is carried out at a pressure above 100 atmospheres. Approximately two seconds after spraying, a foaming reaction occurs, followed by solidification of the formulation. The resulting layer provides excellent heat and waterproofing.

Stages of spraying polyurethane foam

1. Mixing of all components of the composition. As a rule, mixtures of reagents, fire-fighting compounds, isocyanate and fixer are combined. The last two components must first be mixed separately and filtered out when a precipitate forms.

2. Spraying with polyurethane foam from a special spray gun with the help of a compressor (foam generator).

3. Re-treatment of the surface (if necessary).

Average cost of spraying with polyurethane foam in Russia

As you know, prices for various goods and services may differ in the regions of the country. This also applies to the spraying with polyurethane foam. The cost of spraying 1 m ² depends on the thickness of the layer and the volume of the order. The larger the area being treated, the lower the price per square meter.

On average, with small amounts of work, that is up to 200 m ² , polyurethane foam spraying costs 550-630 rubles per 1 m ² . With an increase in the area for processing, the price per square meter is reduced to about 500-600 rubles.

When making an estimate of the cost of spraying with polyurethane foam, the price will also depend on the height of the walls. Typically, these mark-ups are expressed as a percentage of the cost of services. For example, the treatment of walls with a height of more than 3 m will cost more by 10-20%, and basements with low ceilings - by 20%.

The final cost of spraying polyurethane foam is calculated by specialists of companies providing such services. Workers always see the most vulnerable places for the escape of heat from the room. Therefore, experts will be asked to treat these surfaces several times.

Today you can work with polyurethane foam yourself. For this it is necessary to have special equipment and basic knowledge about the sprayed components. It is always better to work together.

Equipment for spraying polyurethane foam by hand

In building shops disposable sets for spraying polyurethane foam on small areas are sold. Most often these sets consist of two cylinders. In one of them - a polyol with Freon 134, in the other - isocyanate.

The equipment is designed to mix components after pressing the trigger of the gun. Hoses with compounds are connected to the reducers. The tanks constantly monitor the pressure and temperature. In the event of a violation of one of the parameters, the material will not grasp better, which will lead to an increase in its consumption.

The cost of equipment for spraying polyurethane foam by one's own hands

The spread of portable units for independent work with polyurethane foam is explained by the fact that in private houses the area for insulation can be quite small. Brigades of professorial workers with expensive equipment simply do not go to such facilities, as this is unprofitable. In other cases, small jobs will cost very much because of the continued assembly of installations. Disposable kits are designed for safe use by amateurs. In areas less than 20 m ^2, they are profitable.

The average cost of a one-time installation is from 16 to 30 thousand rubles. It has approximately 1 m ^{3 of} polyurethane foam. The same volume of the composition bought in a specialized company will cost more than 30 thousand rubles. The benefit of independent work is obvious.

Spraying with polyurethane foam by hand

All work should be done in good weather. High humidity in the street and indoors at this time can slightly spoil the polyurethane foam. Spray your own hands to do it in several layers. This is one of the main principles of work.

Thermal insulation with foamed polyurethane method of spraying begins with complex surfaces: chimneys, ventilation hatches and pipelines. At the same stage, it is necessary to close all the joints that come out. The first layer is desirable to apply a thickness of about 14 mm. After it has solidified, you can proceed with further work.

The second and third layers are applied to each other with a small interval of time. It is optimal to conduct all the works in one day. If this is not possible, then starting each next layer, you need to carefully prepare the surface. With proper planning of working hours, a private house of medium size can be insulated in 2-3 days.

The most efficient sound and heat insulation is a structure consisting of three layers.

Advantages and disadvantages of self-spraying of polyurethane foam

Work on spraying is carried out by specialists with professional equipment quickly enough. All the work takes 1-2 days. Independent execution of the spraying can take more time, as you need to carefully study the instructions and deal with the equipment.

Foamed polyurethane, sprayed with its own hands which is beneficial only in small areas, freezes almost instantly, regardless of the design of the installation. This proves that there is no difference between professional and one-off constructions.

Thus, in each case, the decision to independently or professionally insulate the house is taken by the owners.

Reviews about spraying with polyurethane foam

Most owners of private houses and apartments are satisfied with thermal insulation with polyurethane foam. This method of warming rooms is especially relevant for buildings with a large number of arches and other curved elements.

Spray polyurethane foam, reviews of which are quite numerous, popular for balconies and loggias. After properly performed work in these parts of the apartments it becomes so warm that you can go out in your home clothes even in the winter.

Thus, spraying with polyurethane foam is an effective way of warming private houses and apartments.