Filling voids in the wall with polyurethane foam with your own hands: Instructions + Video

Filling voids in the wall with polyurethane foam with your own hands: Instructions + Video Do-it-yourself filling of voids in the wall with polyurethane foam. Pouring polyurethane foam is an innovative method of thermal insulation, which consists in filling the walls and their cavities in the building with this material.

This technology is used for thermal insulation of buildings for various purposes - industrial enterprises, residential buildings and even offices.

Features of using the material

In terms of its physical properties, polyurethane foam is a thermosetting plastic mass, which has a cellular structure. The material has strength, this is due to the crystalline solid structure, which is only 3% of the total mass.

97% of the mass consists of cavities and pores, which are filled with gas having a low thermal conductivity. Polyurethane foam is formed by mechanical mixing of components. In this process, the two components enter a single chamber and are mixed, while compressed air must be excluded.

PPU composition at the end after production has the form of an even elastic stream. The moment contact begins between the components, a chemical reaction occurs and the result is the formation of a polymer called "polyurethane".

During the reaction, carbon dioxide is released and heat is generated, and the former contributes to the porosity of the structure, and due to the heat, the PUF is raised. Thanks to this, the final product is obtained.


PU foam has excellent properties of a sealant, and therefore polyurethane foam is often used to fill voids with their own hands, as well as to process thermal seams in panel houses, sometimes in road construction. In addition to this function, which is to create the effect of thermal insulation, the use of PU foam makes it possible to solve some more important problems for operation. With its help, it turns out to create high-quality sound insulation, and the wall receives an excellent protective coating that protects the coating from mechanical damage.

Quality is also important, since polyurethane foam can be used in places that cannot be insulated with other heaters due to the peculiarities of the building structure. For example, the treatment of gaps where it will not be possible to use roll and slab insulation, and to use granular materials, it will be necessary to dismantle the roof or part of the wall.

In addition, the use of polyurethane foam makes it possible to improve the appearance of the wall and get rid of defects, and due to the fact that the material is aesthetic, when the structure shrinks, the layer will not crack and retain its properties in full.


Note what advantages filling voids with polyurethane foam has:

  1. Filling voids in the wall with polyurethane foam with your own hands: Instructions + Video Among all similar materials, PU foam has the lowest heat conductivity coefficient.
  2. The coating is characterized by a monolithic structure, in which there are no seams and cracks.

  3. Provides high quality noise isolation.
  4. The material has neutral biological properties.
  5. Polyurethane foam is resistant to mold and various fungal formations, and also does not attract rodents.
  6. The material has a service life of 30 years.
  7. Can be used even in hard-to-reach places.

  8. Retains its thermal properties during the entire period of operation.
  9. Water vapor permeable, resistant to mechanical influences.
  10. No shrinkage.
  11. Has high adhesion rates.

These are excellent characteristics for thermal insulation material.

The principle of operation of the equipment

Equipment for filling with polyurethane foam is divided into 3 categories according to the method of application.

According to this criterion, the settings are divided, which, during operation, perform:

  • Low pressure.
  • High pressure.
  • Foam generators.

High pressure models do not use compressed air during application.

Equipment of this type has a number of advantages:

  • High productivity.
  • The dosage is accurate.
  • The operation is simple.
  • The mixing of the components is excellent, which has a good effect on the quality of the resulting material.
  • Foam can be sprayed in small amounts.

  • The formation of fine particles in the room is minimized by airless application.

The disadvantages include difficulties in service and the high cost of materials. Low pressure models use compressed air.

The advantages of such installations are as follows:

  • Reasonable price for components.
  • Easy to maintain.

  • Simplified design.

Of the shortcomings, we single out the large consumption of PPU and not quite accurate dosage. And a separate category is the foam generator, which mixes the components using air, which is supplied using special compressors.

Characteristics of installations for pouring polyurethane foam

Equipment for spraying and pouring with polyurethane foam UZK-10 and UZK-20 have high performance indicators with relatively small dimensions. Such installations make it possible to perform both spraying and pouring.

The devices have an improved filling head, which, in addition to a long service life and reliability, is distinguished by smooth power adjustment. Such equipment has a timer, which makes it possible to supply PPU in the form in the required quantity. Due to the low weight of the structure, operation is simplified. Such installations can be easily moved by one person.

In the basic configuration there is a spray gun, which makes it possible to perform high-quality spraying.

Installation reliability is ensured by a three-phase motor. The control panel has a power regulator and a remote control. The presence of a timer makes it possible to set the exact time for pouring the mass while accurately determining the volume and mass of the final product.This function helps to prevent overfilling or underfilling, which reduces waste.

Such a company as GK "RosTeploIzolatsiya" also specializes in the performance of casting plants.

The company's products include such individual models as PGM-30AT, PGM-45AT and PGM-75AT. Such devices are equipped with tanks with increased capacity, which have an automatic heating function. They create a fill by molding products with a volume of 0.4, 0.6 and 1 m 3 .

The company also specializes in the manufacture of equipment with universal application, namely, installations with which you can pour material and spray. These are PGM-18M, PGM-18S, PGM-36S, PGM-20AT, PGM-20BN, PGM-27M, PGM-10BN, PGM-27S, PGM-36M, PGM-10AT. These devices are distinguished by their simplicity, as well as by the fact that the required proportions of the material can be set on them.

Features of the technology

The application of polyurethane foam is performed even during construction and after its completion.

In the constructed building, wall insulation with the help of polyurethane foam is carried out in the following order:

  1. Holes are drilled in the wall from the outside and inside, the diameter of which is from 1 to 1 , 5 cm.

    Holes should be drilled over the entire surface of the wall horizontally and vertically every 0.6 meters.

  2. Filling voids in the wall with polyurethane foam with your own hands: Instructions + Video After that, you can start spraying the material from the bottom up, that is, the polyurethane foam gets into the holes. When one level is filled, move on to the next, and so on until you have finished the entire wall.
  3. The order in which the technology is filled from bottom to top is dictated by the final effect.

    With this approach, the material will be evenly distributed throughout the cavity, and this will exclude the formation of gaps, due to which the heat from the room would go outside. Also, polyurethane foam helps to strengthen the wall and increases its strength by filling in the cracks. The material is sprayed under high pressure thanks to special equipment.

  4. A pistol with a special nozzle helps to deliver material into the walls. Being in a liquid state, polyurethane foam begins to spread along the bottom, and then foams and fills the entire cavity.

    Foaming is performed at the lowest resistance. This is important when working with brick masonry, since due to foaming, the free space is filled, but the masonry is not squeezed out. It takes 1 to 2 minutes for the material to harden, and then the polyurethane foam forms a dense, airtight coating.

Pouring polyurethane foam during the construction of walls is carried out according to the following scheme:

  • During construction, observe the space in order to fill it with material for thermal insulation.
  • Pouring is done every 150 cm over the entire height of the building.

    In this case, some grades of material are used that have a low level of density.Such material does not immediately foam, but after a certain period of time, due to which all voids are filled evenly.

  • In addition, the weight of such insulation is relatively small and at the end of its use there will be no additional load on the bearing walls. When operating at home, such a nuance is important.

As you can see, there is nothing complicated about it.


Polyurethane foam is distinguished from other materials that are considered analogs, since it has a huge number of advantages. The technology for using such a composition is quite simple and is performed thanks to special equipment. Today manufacturers offer a wide range of installations to choose from, which will help you get great results without much effort.

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