The texture of Douglas fir is from fine to medium, straight lines and impervious to water. Douglas fir is one of Canada's intensive commercial cork stoppers. It has high hardness and wear resistance. Applicable to places affected by wear such as brackets, bridge members, wooden houses, commercial buildings, etc. Douglas fir is known for its excellent strength-to-weight ratio. Its high proportion provides good nailing and fixing force. Suitable for the production of residential, small business, multi-storey buildings. Wood frame used in industrial buildings. Among the softwood species in North America, Douglas fir not only has a high modulus of elasticity, but also has excellent bending fiber stress, grain tension, transverse shear force, transverse grain pressure and grain pressure. Due to these physical properties, the durability of the heartwood and the excellent physical stability of Pinus tabulaeformis, many construction companies around the world use Pinus tabulaeformis as the standard for determining the ownership of frame wood. Its appearance is very famous and very beautiful. When the design of structures (such as churches, bridges, and stadiums) requires large wooden beams, large spans, or specially shaped arches, Citigroup's laminated beams are usually used in the construction of residential buildings, commercial buildings, public buildings, towers, and water facilities. Used as a horizontal load-bearing frame for roofs, floors and columns. It is also a reliable building material in industrial buildings, warehouses, garages and even architectural constructions that require aesthetics.