Wooden Buildings as Strong as Steel

At the DR Johnson plant three hours to the south—the first in the country to make structural-grade panels—the timber is planed down to a thickness of 1.375 inches, laid flat and set end to end in a single layer. Another layer is glued on top perpendicularly, then another layer glued perpendicular to that and so on—generally three layers of boards for walls and five for floors, according to Lech Muszynski, a wood science professor at Oregon State University—until it is sent into a massive custom-built press for a couple of hours while the glue sets.