Laying plywood on logs: how to lay the floor on the screed?

So that homeowners often resort to thisin a way like laying plywood on logs. The choice of these building materials is justified, since both plywood and support beams are environmentally friendly. Plywood itself, although it is a product of wood processing, retains all its properties. Existing dimensions of plywood sheets. Multilayer veneer can be used not only as a rough coat, but also as a finishing lining. Of course, it is necessary for her to choose the most qualitative sheets, devoid of flaws. For a substrate material with defects on the outer layers is suitable, but all of them must be well glued.

Disadvantages and advantages

Plywood has its drawbacks. One of them is a weak resistance to moisture. True, some brands can be used even in extreme conditions, but their use inside the premises is undesirable because of the harmful substances (formaldehyde) they emit, so it's best to make the floor of plywood grade FK. Improve its characteristics of moisture resistance is not so difficult, but you can be sure of the harmlessness of such a floor for health. Another drawback (not even the plywood, but the floor on the logs) is that the room after its installation loses height. Characteristics of plywood. The undoubted advantage of plywood is that it is much cheaper than boards. In this case, the material of one thickness is 1.5 times stronger, which allows you to save money when buying logs for logs (they can be stacked less often). The table shows how far apart the beams can be from if sheets of different thicknesses are placed on them (the table gives data on the most commonly used plywood for laying the floor). The thickness of the plywood (mm) The distance between the lags (mm) 15 400 18 450 20 500 22 600 It must be added that it is best to lay logs on the leveling screed. This will greatly simplify the task of creating an absolutely flat floor. In addition, for their laying, it will be possible to use thinner bars (50 x 50 and 100 x 50 mm), since they will be supported on the screed by the entire surface. Mounted on a flat base floor will not squeak and swing. In addition, the placement of joints of the beams are less serious requirements than when laying logs on an unprepared surface. Back to contents</a>

Align base

Back to contents</a> Dismantling of the old floor and the installation of waterproofingSo, before you make a floor, its foundation needs to be prepared. These measures are not only to level the overlap, but also to ensure proper waterproofing, because it will prevent the appearance of mold, rotting wood and improve the thermal insulation characteristics of the new coating. Scheme for dismantling concrete floor screed. First of all, the old floor and screed are removed. It should be removed to the base with a perforator or crowbar. After removing all that is left of the old coating, carefully inspect the overlap and repair it, covering with a solution of the crack and pothole. Perhaps, it is necessary to pound the most sharp protrusions, so that the surface of the overlap becomes smoother. Leave the ground for a while to dry. Then treat it with antiseptic drugs, and after drying them with a primer. Now you can put a waterproofing device on the base. A more modern technology of its device is the application of a special mastic on the surface. It is applied by brush in 2 layers. In addition, the composition is smeared and the walls to the height of the future screed. You can also use traditional waterproofing materials: roofing material and polyethylene film. They also fit into the wall. In addition, all the joints of the waterproofing are overlapped. Joints of roofing material are filled with liquid bitumen or mastic based on it, and the joints of polyethylene are pasted with adhesive tape. Back to contents</a> Plotting the plane To make it perfecthorizontal screed under the plywood on the logs, on the base are laid beacons, along which the solution will be leveled. Install them using only the building level, the occupation is tedious. It is better to build the plane of the future screed, using:

• chalk and chop cord;
• hydro level;
• tape measure or ruler;
• nylon threads;
• dowel-nails or self-tapping screws (depending on the material from which the walls are made).

The scheme of setting the lighthouses. First, a so-called zero line is created. Put a point on the wall (at what height from the floor it will be, you can choose yourself, if only it would be convenient for you to make the markup). Using the hydraulic level, make one more mark on the same wall. Between them, pull the cord and beat chalk horizontally. Repeat the procedure on the remaining surfaces. On walls up to 3 m long it is enough to put 2 points, on more extended surfaces the number of marks should be increased. The highest point of the base is selected. From its projection on the wall, the distance to the zero line is measured. From this value, 2-3 cm is subtracted. At the resulting distance, apply a bottom line of the point from below and connect them with chalk-beaten contour lines. Screw along the dowel-nails or screws and pull between opposite walls of the thread. The plane is ready. Installation of beacons is carried out on it. After that, the solution is poured and leveled. Back to contents</a> Preparing the plywood and lag and laying the battens For nowthe solution freezes, prepare the material, so that the plywood laying on the logs later passed without delays. The logs must be dried under a canopy. In a decade, treat them with an antiseptic. While the boards are drying, improve the characteristics of the plywood. To do this, prepare:

• drying oil;
• brush or roller;
• iron or building hair dryer.

Scheme of laying support lags on a concrete base. The oil is heated to 60 ° and is applied to the veneer on both sides. After that, the surfaces are dried with an iron or a hairdryer. Impregnation is applied again, etc. The procedure is repeated until the drying oil ceases to be absorbed. By the way, the edges of the sheets after trimming must be additionally impregnated with impregnation. It's been 4 weeks. The screed is frozen, logs and plywood are prepared. You can start installing the battens.

Put another waterproofing membrane on the screed.

Now lay the logs around the perimeter of the room. The distance between them and the walls is 2-3 cm.

Drill through bars through holes every 500 mm. Through them, put a marking on the floor.

Make holes in it with a depth of at least 50 mm. The logs will be fastened to the screeds with anchor screws.

After stacking the frame, fasten the cross bars in the same way. They should be directed along the short walls of the room. The correct installation of the beams is checked by the building level.

After laying the heat insulator (mineral wool or expanded polystyrene), plywood is laid along the logs. Back to contents</a>

How to put plywood?

The floor of plywood looks like this. Layout of plywood laying on logs.

The edges of adjacent rows of coatings should be supported by uneven bars.

Between the adjacent sheets there should be a gap of 0.5 mm (if the finish is finished) and 2 mm (if the floor is rough).

Between the veneer and the wall, a gap of 2 mm is left.

Cross joints in adjacent rows should be spaced apart from each other by at least 500 mm.

The plywood is attached to the lags by self-tapping screws. In addition, you can use glue. Before screwing the fasteners in the sheets, holes are drilled and countersunked.

The step of fastening at the edges is 150-300 mm. In the center of the sheet you can withstand a 500-millimeter step. On the edges lying opposite each other, the screws are screwed in a zigzag pattern.

Seams are sealed with a sealant.

If you put another layer of plywood, then it is stacked perpendicular to the previous one.

Comments

Comments