The use of foam under the floor screed

The use of foam under the floor screed Polyfoam for insulating the floor under the screed - installation instructions

In absolutely every structure, special attention is paid creating a reliable and very warm floor. For this, foam is used under the screed, and this task can be very easily solved. Providing comfortable living conditions and the desired comfort in a house or other structure is achieved by different methods, which include insulation by means of foam.

Most often I use this method of insulation for rooms that are located on the first floor of a high-rise building or in a private household that need to increase the degree of heat of the floor covering.

Let's see the features of floor insulation with foam under the screed.

The use of foam, advantages

Polyfoam is considered the most effective insulation material. Its price is available to every consumer and can differ in a huge number of positive indicators.

  1. Heat storage. Polyfoam has excellent heat preservation properties because it has low thermal conductivity. This will be provided by the structure of the material, which is made of special granules with an air layer, and it works according to the principle of action.

  2. Sound absorption. Polyfoam as a building material has excellent sound insulation performance. For this reason, the use of foam will absorb sound from both the inside and outside. It can handle vibrations and sounds such as traffic noise and loud music very well.
  3. Safe consequences from the influence of open fire and high temperatures.

    The base of the foam is made of a material that has self-extinguishing properties. In a fire situation, such material does not burn for long, and while burning, substances will be released that are similar to burning wood.

  4. Long service life. High quality foam has a long service life. This is due to the fact that the production technology and raw materials are not prone to decay and shrinkage.

All of the above properties characterize polystyrene as a universal building material that is ideal for insulating any buildings. This building material perfectly protects from the summer heat and the cold of winter. Its use is quite simple, because the foam is lightweight and does not require special tools for processing.


Applying foam for screed floors

The use of foam under the floor screed Like any other material for insulation, polystyrene, during installation, requires accompanying and additional building materials. screed flooring foam is constantly used with polyurethane foam, glue-type solutions, construction tools and self-leveling mixes / screed solutions.

At the very beginning, it is required to carry out preparation work, which consists in leveling the floor-type coating using special leveling mixtures or simple concrete mortar. As a rule, the thickness of the initial (namely, the draft) layer will vary from 3 to 5 cm. After the initial layer has dried perfectly, to level the surface, it is required to lay a layer of waterproofing (specialized films). This is required in order to prevent the ingress of condensation and moisture. The fact is that when wet, the foam begins to lose its properties of sound and thermal insulation.

Next, the foam layer is laid for the final leveling and fixing of the floor surface. This procedure involves an uncomplicated installation of the selected foam plates over a common surface. To do this, use a special brand of foam, which has a density and thickness of 5 and more, see

It is required to take into account that the greater the thickness, the better the final result will be. To avoid a decrease in the degree of efficiency of the applied technology, foam sheets should be laid as tightly as possible. If gaps appear during installation, then you need to fill them with polyurethane foam.

Complete this work, and then it is required to reinforce the layer from the outside, which is carried out by means of a small screed (its layer will be from 1.5 to 5 cm) and a reinforcing type mesh, which is laid on top of it.

At that time, the main installation work will be practically finished. The final measures in this technology will be the pouring of the final layer, which will be made of a concrete type building mixture. The laying layer should be from 5 to 6 cm.

Carrying out the rest of the construction work is possible only after the concrete has dried perfectly, which in this case will be able to guarantee the technological degree of surface strength.

Recommendations of masters for making screeds using foam

What kind of foam for the floor under the screed is used for insulation? When performing work, it is required to take into account specific recommendations and technological nuances.

What thickness of foam is used (and where)

The thickness of the material under the screed in one-story and multi-storey buildings is not the same. So, the lower the insulated floor covering is to the base line, the thicker the applied foam must be. In buildings with more than one floor, you can use foam with a thickness of 5 and more cm.

Location of the material in the screed

The use of foam under the floor screed The placement of foam during installation can be very different. For example, it can be installed between a concrete screed and a finishing layer (clean floor) of tiles or planks. It is also possible to lay the foam between the final screed layer and the waterproofing. This option is best used for flooring with ceramic tiles or natural stone coverings.

Reinforcement layer

In order to perform this stage of work, you need to use only a certified and high-quality mesh, which will act as a support base for in order to distribute the external load.

Thanks to the foam, it is possible to provide excellent thermal insulation of the room, which makes it possible to reduce waste on energy consumption.

What gives insulation with the help of foam

The implementation of each of the recommendations on the laying technology of foam under the screed guarantees:

  • Increase in the level of sound insulation.
  • Reduction of heat loss indicators.
  • Constant room temperature.

Consider what time it will cost you to make foam plastic under the floor screed.

Costs of work

Most people doubt how necessary this technology is for repair work.

But the analysis of the reduction in the expenditure of funds for payment for the use of energy carriers shows that this technology from year to year will begin to reduce the financial pressure on residents of houses and owners. Such technology will be the best way to help establish coziness and comfort, as the main indicators of a practical and high-quality assessment of each room. The main indicator of the financial costs for the implementation of the entire working complex will be expenditures per 1 m 2 area, which, as a rule, can be from 65 to 135 US dollars.