This grain direction provides the panel with its greatest strength. When installing the grain should be run horizontal to the joists or studs. Lumber Core Plywood Lumber core plywood is made in much the same way as Veneer-core with exception of the core. The core is a strip of solid lumber with thickness of up to 1 inch. The edges of lumber core plywood will hold screws fast.
Plywood is either construction or hardwood.
Construction is mainly softwood and is available in 4x8 panels. The most usual thickness is to in. Sheathing panels have two ratings roof and floor. Thicker panels and higher grade can be ordered but are more expensive. Inc. PageWise makes no representations about the content published on this site.