Plywood is a wood-laminated board, a multilayer building material made by gluing specially prepared veneer. To increase the strength of plywood, veneer layers are superimposed so that the wood fibers of each sheet are perpendicular to the neighboring ones, therefore, in order for the directions of the outer layers to coincide, the number of veneer layers is usually odd: from three or more.
Laminated plywood is plywood that is not afraid of water and is resistant to mechanical damage due to a special protective shell covering it from the outside. The inner layers are made of several layers of glued and pressed veneer (thin sections of tree trunks from 1 to 10 mm thick), fiberboard or a combination of these materials.