How to lay plywood on the floor?
A pledge of durable exploitation of floor coveringsany type - strict adherence to all the technology that begins with the preparatory work on laying the foundation, and ending with the cleaning of the room in which this laying was carried out. How to put plywood on the floor qualitatively, so that when it is used in the future there are no problems? This will be discussed in our article.
Plywood flooring for concrete
Plywood is laid on concrete floors with a minimum height difference, as follows.
- Floors must be freed from debris and thoroughly washed. Wait for the concrete to dry completely.
- Make a waterproofing. For this purpose, the most common thick polyethylene film is completely suitable for covering the whole surface of the floor, so that one strip is slightly overtaken by the other. After that, all the strips are fastened with a usual tape.
- After the preparatory work begins layingsheets of plywood. It is better to start this from the threshold, since in this place the greatest patency, and you will have a whole sheet in this zone. Laying plywood is done in vain. Between the sheets there should be a necessary gap for deformation 2-3 mm wide. Between the wall and the sheet it should be 10-12 mm.
- For attaching plywood to a concrete floor, you needpunch to drill holes. The hat of the screw should be slightly more than the diameter of the drill, then the screw will not fall through the plywood. In the drilled holes are inserted plastic dowels, into which screws are screwed. Plywood sheets should be completely fixed in the center and around the perimeter.
- If a sheet of plywood does not fit, then conduct its cutting with a jigsaw.
- When you completely lay the sheets on the floor,it will be necessary to make sure that all the screws are drowned. If some of their hats remain sticking out, they can damage the floor covering that you put on top. Especially quickly it will show up on linoleum.
If we put plywood on a wooden floor, which also has minimal misalignments, then the work is carried out approximately the same way but with a small difference.
- Hats of nails with which the floorboards are nailed must be drowned as deep as possible.
- The floor can be traversed by a grinding machine if the edges of the boards are deformed and bent to the top.
- Plywood sheets in this case are screwed directly with screws (without plastic dowels) to the wooden floor surface or nailed.
The flooring is carried out on a concrete base. Logs are dry bars with a cross section of 100mm by 50 mm. To install them you need a level. The logs are laid over the entire area and the entire perimeter of the floor at a distance of 40 cm. After this, a crate is made at the distance of 50 cm with the help of cross-pieces.
In order to protect the wooden floor from condensation, a glass of parchment is spread. This material is soft, in it bitumen is impregnated with roofing cardboard. It is widely used in the construction industry.
To make the floor more durable, the plywood must be laid in two layers. In addition to fixing screws, layers of plywood can be glued together. For this, PVA glue fits perfectly.
After this, the correctness of this construction is checked:
- waterproofing in the lowest layer;
- crate in the form of crossbars and lag;
- a layer of waterproofing on the lags;
- plywood in two layers;
It is important to observe the following nuances:
- there must necessarily be a gap between the plywood sheets;
- Angles should not converge in the same places;
- The edge of the plywood should lie on the logs.
Adjustable plywood floors
Now we need to consider such an option - howto lay plywood on the floor if communications are passing through it, or if it has a height difference of 10 or 15 cm. Such a floor is called an adjustable or raised floor. This new technological solution has advantages over the method of laying on lags and screeds.
The main advantages of the adjustable floor:
- good thermal insulation and durability;
- reliability and practicality;
- speed and cleanliness of the assembly.
Flooring is carpeted:
- With the help of adjustable plywood, due to which the required height is selected;
- adjustable lags when fitting them.
The first way the floor rises by 3 cm. For this laying, plywood is used in 2 layers. This method is considered the most effective. Lags here replace the bushings with internal thread. In the plywood a hole is drilled beforehand, where the bushing is then inserted.
To attach the sleeve to the floor inwardssix bolts of columns are screwed. Then they are attached by dowels to the floor. The final adjustment is carried out with a wrench. After leveling the first layer, to avoid unnecessary seams, lay the second layer so that the joints of the lower layer are overlapped by the top sheets. The top layer is screwed with screws to the bottom layer.
The second method can be chosen if you have high ceilings and you are not afraid to reduce the room by 7-9 cm in height.
What plywood to lay on the floor?
In the beginning, it is necessary to choose the step of lag thatdepends on the size of the plywood sheet. For example, the sheet size is 122 x 244 cm, the pitch should be 60 cm. For greater reliability, the lags are placed in squares. In this case, the size of the square will be 60 x 60 cm. In most cases, a log 50 x 50 mm serves as a lag.
For the device of a floor it is better to get plywood withincreased moisture resistance, the space between the concrete base of the floor and the plywood is filled with a heater. For the device of such a floor, plywood thickness of 1.5 cm or 1.8 cm is best. If we put plywood on a wooden floor or lay on logs with a square of a cell of 50 x 50 cm, then for the device of such a floor the required thickness of plywood should be 1.2 cm or 1.5 cm.
Such floors, as a rule, are reliable and durable, and on them you can lay not only any covering, but even artistic parquet.