Features of selection and installation + Video and Photo

Features of selection and installation + Video and Photo There are a large number of floor coverings, for example linoleum, laminate, parquet board and the like and such floor materials both linoleum and laminate flooring involve the use of a backing.

Substrate - a material that protects the finishing layer of the material (floor covering) from moisture and deformation. Such material can be made of foamed polyethylene, it has good insulating characteristics and can be used as thermal protection for "warm" and simple floors.

So in this text we will consider such a material as expanded polyethylene, or rather a substrate made of this material. This material can be bought at any hardware store.

General information

A backing made of polyethylene foam is a canvas with a thickness of two to five millimeters. This material is sold in rolls up to three meters wide. The polymer has a closed cell structure, which consists of small cells filled with gas.

Nowadays there are several types of polyethylene foam, and they differ:

  1. Features of selection and installation + Video and Photo By the type of starting raw material (LDPE, HDPE, LDL or a mixture in various proportions. Because of this, the final products may differ in density and operating temperature.

  2. By molecular structure (simple or "sewn" electronically or chemically).
    In this case, the qualities of this product vary greatly, that is, "sewn" products are more durable and can withstand higher temperatures.


Thermoplastic polymers are the basis for the production of polyethylene substrates, regardless of varieties.

This is why they have the following features:

  1. Resistant to most acids and alkalis;
  2. Not capable of rotting and does not promote the growth of fungus;
  3. Features of selection and installation + Video and Photo Has increased thermal insulation;
  4. Moisture-proof freezing and air tightness;
  5. Soundproofing qualities;
  6. Cushioning. It helps to hide the unevenness of the base and does not allow the tile to sag;
  7. Durability.

Types of backing

A backing made of foamed polyethylene is produced in the following types:

  1. Simple. It consists of a single layer of uncoated polyethylene foam.
  2. Laminated backing with metallized film coating. This coating makes the substrate durable and reflective.
  3. Foil with one-sided or double-sided coating.

    This coating acts as thermal insulation not only due to the properties of polyethylene foam, but also due to the reflective effect of the foil.

Comparison with other substrates

Nowadays, a large number of materials, both natural and synthetic, are produced, which are used as an insulating substrate. Polyethylene foam is not inferior, and even somewhat superior to most of the materials.

Cork, wood, linen and expanded polystyrene backing allow moisture to pass through, but the expanded polyethylene backing does not.

Foamed polyethylene sheets can be overlapped, this method provides a flat surface.

To ensure waterproofing of the joints of foamed polyethylene sheets, they must be glued with adhesive tape.

Also, this material has a low price and for this reason it is highly popular.

Selection of polyethylene foam backing

Type of flooring

When choosing a foam backing, it is necessary to take into account under what flooring you will use it.

The polyethylene foam backing is selected according to the following criteria:

  1. Features of selection and installation + Video and Photo The underlay should not be very thin because it may not give the desired effect, but if the underlay is too thick it will spring back when walking.
  2. For a seven millimeter laminate, the backing thickness should be approximately two millimeters.

  3. For thick coatings (up to about eight or nine or even more millimeters), a substrate of at least three millimeters must be selected.

Peculiarities of mounting a polyethylene foam backing

Laying a polyethylene foam backing is not at all difficult, but several rules must be observed :

  1. Before laying the subfloor, it is necessary to level and dry the subfloor well;
  2. If the floor is leveled with a cement-concrete screed, then first check the percentage of its moisture.
  3. The foil backing should be laid with the foil side up and insulated from any electrical wiring that may be routed nearby;

To prevent the foamed polyethylene backing sheets from shifting and to ensure good waterproofing stacked end-to-end, not overlapped. And also all joints (seams) must be glued with adhesive tape, that is, tape.

Well, we told you about such a material as expanded polyethylene, (more precisely, about a substrate made of this material), about the nuances of its installation and technical qualities, and we hope that this article will be useful to you.

We wish you good luck in your endeavors and patience!

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