Plywood is one of the most widely recognized multi-purpose engineered wood-based panel products used in Canadian construction projects. Plywood binds resin and wood fibre sheets to form a?composite material sold in panels. A typical plywood panel has face veneers of a higher grade than the core veneers. The function of the core layers is to increase the separation between the outer layers where the bending stresses are highest, improving resistance to bending forces.
How is plywood made?
Plywood panels are fabricated from multiple layers or plys of softwood veneer glued together with the grain direction of each layer of veneer perpendicular to that of the adjacent layers. These cross-laminated sheets of wood veneers are fastened together with a waterproof phenol-formaldehyde resin adhesive and cured under heat and pressure. In BC, plywood is made from softwood species, usually Douglas-fir or spruce, pine and fir?(collectively known as?Canadian softwood plywood—or CSP). The most common dimension is 4 feet × 8 feet. Plywood varies in thickness, the most common being ?-inch.
What is plywood used for?
There are a range of plywood products like Film Faced Plywood, Commercial Plywood, Melamine Plywood, Fancy Plywood, PVC Plywood, HPL Plywood, etc. for structure and non-structural uses suitable for both wet and dry service conditions, including subflooring, single-layer flooring, wall, roof and floor sheathing, structural insulated panels, webs of wood I-joists and concrete formwork. As exterior wall and roof sheathing, plywood can provide resistance to lateral forces such as wind and earthquake loads and form an integral component of the building envelope. It may be used as both structural sheathing and finish cladding. For exterior cladding applications, specialty plywoods are available in a broad range of patterns and textures, combining the natural characteristics of wood with the strength and rigidity.