Plywood panels are built up from multiple layers or plys of softwood veneer that are glued together so that the grain direction of each layer of veneer is perpendicular to that of the adjacent layers. Plywood panels have superior dimensional stability, two-way strength and stiffness properties and an excellent strength-to-weight ratio. They are also highly resistant to impact damage, chemicals, and changes in temperature and relative humidity. Plywood remains flat to give a smooth, uniform surface that does not crack, cup or twist.
Plywood is suitable for a variety of end uses in both wet and dry service conditions, including subflooring, single-layer flooring, wall, roof and floor sheathing and concrete formwork.