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What is Douglas Fir Timber

Douglas Fir is often the first choice when architects or engineers look for structural timber that is durable. Douglas Fir fulfills this criteria since it has a superior strength-to-weight ratio. Combined with the fact that it has excellent nail-holding and fastening capabilities it gives Douglas Fir Timber a solid performance record during challenging weather conditions and even during earthquakes.

Canadian Douglas FirTimber

 

The following properties are associated with Douglas Fir Timber:

  • highest ratings of any western softwood for extreme fiber stress in bending
  • highest ratings of any western softwood for extreme fiber stress tension parallel-to-grain
  • excellent ratings of any western softwood for extreme fiber stress
  • highest ratings of any western softwood for extreme fiber stress horizontal sheer
  • highest ratings of any western softwood for extreme fiber stress compression
  • excellent ratings of any western softwood for extreme fiber stress perpendicular-to-grain and compression parallel-to-grain. 
Douglas fir is often selected for four- and five-storey timber frame buildings because of its elasticity. Elasticity is the ratio of the amount a piece of timber will deflect in proportion to an applied load. The elasticity is an important consideration in the design of floors and other horizontal structures.

Douglas Timer is the ideal softwood to be used in timber framing for residential or cottage applications as well as for light to moderate commercial applications. In some cases Douglas Fir Timber is used for structural formwork applications as well.
Its physical working properties, as well as the moderate durability of its core wood, and its dimensional stability makes it a preferred softwood choice for many builders worldwide for framing timbers. Douglas fir products are also available from Brown and Rutherford as preservative pressure treated for in-ground and ground-contact installations.

Please contact us if you would like to learn more.