Fourth grade - it's poor quality plywood, which can be found defects in the edges of sheets, fused or fallen twigs, and similar violations of the structure. In addition to this classification, plywood varies by application, durability and appearance. All of this affects her stoimost.Kakuyu plywood is better to use? Advantages and disadvantages of the material advantages of this construction material are obvious - the strength, hardness, surface - some types of plywood for strength compared with metal coating, easy to use (as well as ease of body weight), flexibility, ability to keep warm, and many others. Today plywood used in construction of buildings for decoration both outside and inside. To to choose the right plywood you need, you need to know exactly what you want to use it. Knowing the original data, you can pick up the plywood, which will last longer and will be safe to use. For lining building from the outside is more appropriate or bakelite laminated plywood. It can be called "plywood WBP." This water-resistant plywood.
These kinds of plywood subjected to special treatment and transfer humidity, changes in weather conditions and mechanical stress. Deficiencies can be identified here, if bakelite plywood used indoors. The glue that held together its layers, contains toxic substances. Therefore, Finishing the interior is better to use plywood that is glued together with resin karbomidnoy (so-called plywood FC). Known to all Hardboard or fiberboard - a hot-pressed sheets of cellulose method, as well as the DSP - Lists of technical wood chips held together with resin - is also plywood. It should also be remembered that the plywood can be sanded, polished on one side and with two storon.Kak use plywood to cover the walls and ceilings? For began lining the walls or ceiling with plywood, you need to prepare rack frame. Need rods, sticks, nails or screws. Toward the bottom surface of the slats are attached to a horizontal position. Just attach intermediate rail, a distance of approximately 400 - 500 mm from each other. After the vertical bars are fixed, so the edge of the plywood will be attached. To fix the plywood, you can use nails and screws, filling the plywood sheets back to back. In order to avoid gaps in the expansion joints, which over time may become wider, you can use the rails with double groove. Plywood in this case is inserted into the grooves and over the joints can not worry. In addition, since the edge of the plywood sheets are protected from damage. After covering with plywood walls can cause the top paint, varnish, or film. If plywood is packed with no intermediate strips, the gap better close up "sealant" or putty.