In terms of plywood construction, which method provides better structural integrity?

Gluing veneers with alternating grain directions provides superior structural integrity in plywood construction due to the way wood expands and contracts with changes in moisture and temperature. When veneers are laid with their grains running in alternating directions, each layer supports and counteracts the stresses of the layers above and below it. This cross-laminated approach enhances the overall strength and stability of the plywood, reducing the likelihood of warping or splitting.

This method effectively distributes stress more evenly across the panel, which can also help improve resistance to delamination. In contrast, when veneers are glued with the same grain direction, any deformation in one layer may transmit stresses directly through to adjacent layers, potentially leading to weakness. Other options, such as using solid wood or assembling pieces with screws, do not leverage the inherent advantages of plywood construction, which emphasizes the layered, bonded nature of wood veneers for optimal performance.