CLT is an engineered wood product. By that, I mean that it is a product assembled from pieces of lumber, usually two-by-sixes, eight feet wide, 40' feet long, layered at right angles to one another, like the layering of thinly sliced veneer used to make sheets of plywood. Picture a laminated wood beam, with the layers all running one direction. Now remind yourself that, in CLT, the layers run at right angles to one another, like plywood. The product is incredibly strong for its weight, which is about one-third that of steel. Some refer to CLT “plywood on steroids.” It’s a very apt description.