Douglas Fir
Pseudotsuga menziesii • Softwood
Grain Pattern
Straight, featuring prominent growth rings with a distinct transition between light earlywood and dark latewood; shows a flat-sawn cathedral pattern in some areas.
Color Description
Heartwood is typically a light reddish-brown, while sapwood is pale yellowish-white. This sample shows significant graying and weathering with dark oxidation due to outdoor exposure.
Hardness Rating
660 lbf (Soft)
Durability Rating
Moderately Durable; offers reasonable resistance to decay but is susceptible to insect attack if not treated.
Common Uses
Construction framing, heavy timbers, exterior decking, flooring, plywood, and utility furniture.
Geographic Origin
Western North America (Pacific Northwest)
Market Value & Sustainability
Estimated Market Value
$1.50 - $4.00 per board foot for dimensional lumber; higher for clear architectural grades.
Wood Age Estimate
The visible silver-gray patina and surface checking suggest an age of 10-20 years for the structure, having been exposed to UV radiation and moisture.
Sustainability Status
Least Concern (IUCN); widely available as FSC certified and considered highly sustainable due to large plantations and fast growth.
Workability
Generally easy to work with both hand and machine tools, though it can split easily and may cause 'tearout' on the latewood rings. Glues and finishes well.
Notable Features
Distinctive resinous, sweet scent when freshly cut. Noted for having one of the highest strength-to-weight ratios of any softwood.
Finish Recommendations
For exterior use, a penetrating oil-based stain with UV inhibitors is recommended to prevent further graying and checking.
Identification Confidence
Medium-High; the prominent latewood growth rings, the specific appearance of the surface checking, and its common use in structural outdoor applications indicate Douglas Fir.