In apartments and private homes are often significant differences in elevation at floor level. As the ground to install the floor unreasonable, the curve of the surface to align. To replace the floorboards – the process laborious and time consuming, so you can stay on the installation of self-leveling screed, over which is placed the canvas of plywood.

What plywood is

Plywood is a sheet material of a structure of a thin veneer of cloths, between which is located the adhesive layer. The strength of the product determines the number of sheets of wood. Veneer is laid so that the direction of the fibres of the canvases are mutually perpendicular. Plywood is made by gluing under pressure. After drying produce processing protective compounds.

What plywood can be used for floor

For device sub-floor you can use water-resistant plywood with a thickness of 8-9 mm. As a rule, this surface is placed insulation, the weight of which is small. Therefore, the high strength of plywood is not required. But it must meet other requirements: watertightness and resistance to development of fungus and mold. Therefore, the choice of material should primarily focus not on its thickness, and on the mark.

High humidity has a plywood of FSF. But these paintings are composed of formaldehyde and for premises not suitable. The best option is plywood FC, which has medium resistance and is environmentally safe. This building material can be safely used for mounting the roughing and finishing of the floor.

If you plan to lay parquet or laminate, it is recommended to use a cloth consisting of 9-11 words of veneer. They have a thickness of 12-16 mm. For levelling of the coating under the flooring will fit 12 mm plywood of mark FK. Besides the thickness should be taken into account and the material from which manufactured veneer. As raw materials use birch or coniferous trees (spruce, cedar, pine, fir). For floor installation it is recommended to purchase birch plywood.

You should pay attention to the quality of the material. The first allows for the presence of small cracks and easy pokoroblennost, but products of this variety the best, but also the most expensive. Second grade allow for dings and scratches, but no more than 5% of the total area of the canvas. Products of the third grade may have worm holes, knots and cracks. The fourth attribute of the canvas with numerous flaws of all kinds. For installation of the floor is better to choose a plywood of the second and third grade, as the first is too expensive for this purpose, and the fourth includes products of low strength, which is unacceptable for such work.

Plywood is sanded (SH1 and R2) or untreated (GP). Polished can be processed at one end (SH1), or both (ø2). In addition to this option in the choice of material for floor installation you need to consider the class of emission reporting formaldehyde weight of the adhesive composition. It is better to buy the product with index E1. Conclusion: to the best choice is birch plywood second-third grade stamps FC with the characteristics of SH1 and E1 with a thickness of 12-16 mm.