Douglas fir is a type of wood used in construction, with light colored edges and narrow widths, and heartwood ranging from yellow to reddish brown. Early and late woods have distinct colors, with the latter having deeper and sharper bands. This color difference results in different wood grain shapes when sawing flat. The wood texture is fine to medium, with straight lines and non permeable. Douglas fir is one of the strongest commercial cork woods in Canada, with high hardness and strong wear resistance, suitable for places where wear is a factor, such as brackets, bridge components, wooden houses, and commercial buildings.
structural characteristics
Huaqisong is renowned worldwide for its excellent strength to weight ratio. Its high specific gravity provides excellent nail holding and fixing force, making it suitable for making wooden frames used in residential, small commercial, multi story, and industrial buildings.
Among the soft wood tree species in North America, Douglas fir not only has a high elastic modulus, but also has excellent external bending fiber stress, tensile strength along the grain, transverse shear force, transverse compression force, and longitudinal compression force. Because Douglas fir possesses these physical properties, as well as the durability and good form stability of heartwood, many construction companies around the world use Douglas fir as a standard for evaluating frame wood.
Huaqisong is famous for its structural performance and beautiful appearance. When designing structures that require large wooden beams and long span arches (such as churches, bridges, and sports halls), Douglas fir is a commonly used type of wood. In the construction of residential, commercial, public building structures, tower buildings, and water facilities, laminated beams made of Douglas fir are commonly used as horizontal load-bearing frames for roofs, floors, and pillars. When constructing industrial plants, warehouses, garages, and even building structures that require a beautiful appearance, glued laminated beams are also high-performance building materials.