If you need to create an even and stable coating on the concrete floor for the subsequent installation of linoleum, laminate, parquet or carpet, this is achieved by laying plywood sheets. This method allows, at minimum cost, to hide various irregularities on the main concrete pavement and dramatically raise the level of use of the subsequent layer of flooring. The use of plywood improves the thermal insulation properties of the surface.
Scheme of plywood flooring for concrete.
Before installing this material, the concrete base must be carefully leveled - in the horizontal plane it must be level and not have height differences greater than 2 mm, otherwise the concrete must be leveled using cement-based screed. Since drying can take up to 1.5-2 months (it depends on the season when repairs are being made), you can begin to select the right type of plywood for the floor and the materials and tools necessary for its installation.
There is a wide variety of plywood sheets on the construction market. They are of the following types:
Figure 1. Floor leveling scheme.
For laying on concrete, sheets 12-15 mm thick will be needed. Still need glue, which is selected based on the following considerations:
For laying plywood on a concrete base, such adhesives are commonly used:
is done Figure 2. Floor finishing and primer scheme.
After acquiring the right materials and tools, you can begin to test the plywood, since its standard sheets have an uneven surface, and there may be residual stresses in them. Therefore, for temperature compensation of the material and alignment of its individual parts according to the levels of humidity, it is necessary to cut the purchased plywood into squares of 600 X 600 mm. This will allow more accurate alignment of irregularities on the concrete and will not allow undesirable voids to form.
The obtained squares inspect - there should be no traces of material separation on them. Then they should be spread over the entire surface of the floor in the room and adjusted to all angles and protrusions in the room. At the same time, it is necessary to leave seams between the squares of 0.8-1 cm wide. In places where plywood fits the walls of the room, a gap of 15-20 mm is left. Sheets of material should be laid with a certain offset - it is not recommended that they be collected in one place. Fitted squares should be numbered, and their arrangement should be sketched and then removed from the floor.
Laying plywood is done only on a surface that must be carefully leveled. Figure 1. For this, the following operations must be carried out:
Figure 3. Layout of plywood sheets.
The technological process of this operation is performed in the following order:
Scheme plywood flooring on logs.
Between the individual fasteners the distance is selected in the range of 150-200 mm. They should be located around the perimeter of the squares and diagonally at a distance of 20 mm from the edge of the sheet.
To obtain a flat base surface, the plywood laid during installation must be carefully polished. The technological process of performing this operation is as follows:
Tools for plywood laying.
After that, there should be no burrs on the surface, which can appear in the places where the seams are located. This will help to correct small differences in height between the squares of the material.
After completing the above works, you can proceed to laying the main coating - linoleum or parquet. Before this, you first need to check with the rail (rule) the evenness of the plywood base. Its length can be 180-200 cm. Putting the tool to the floor, make sure that the distance between its surface and the laid sheets of plywood does not exceed 2 mm in height.
If this is the case, then the work is done qualitatively.
If installation of plywood on concrete is done, then it is necessary to strictly adhere to the above described technology.
Didn't find the answer in the article? More information on the topic:
How to level the floor in a new building with your own hands?
Instructions on how to level the floor in a new building in case of serious drops in the horizontal surface of the base. Preparation and leveling of floors using log or cement-sand screed.