DOUGLAS FIR HIRAKAKU

Exemplary Performance

Of all North American softwoods, Douglas fir has: 

• the highest strength-to-weight ratio; 
• the highest modulus of elasticity value (MOE); and
• extremely high specific gravity. 

Because of its superior strength and stiffness values, Douglas fir is the preferred species for engineered systems and prefabricated trusses. It is the species of choice for structural members in four and five-storey wood-frame buildings, and is selected the world over for all types of traditional framing. 

Douglas fir’s high MOE value is a reflection of its stiffness—one of the most important considerations to control deflection in the horizontal members of any framing system.

Because of its high specific gravity, this species is universally recognized for its excellent nail-holding/fastening capability, which along with its strength and MOE value, has led to documented superior performance against storms and earthquakes. 

Because of its beauty, Douglas fir also is manufactured into premium doors, panelling, cabinets and architectural members. It machines to an exceptionally smooth, glossy surface and is easily worked with hand tools.

Construction images courtesy of 
Center for International Trade in Forest Products (CINTRAFOR),
University of Washington, Seattle, WA

Courtesy of San-ei House Co. Ltd., Kanagawa