Douglas Fir...

Unlike other window makers, we use only Coastal Douglas Fir (Pseudotsuga Menziesii to be botanically precise) in our frames and sashes. This tightly grained wood does more than just give our windows a rich, warm texture— it’s also naturally tough and resilient, yet remarkably workable, meaning it is ideal for precision milling and capable of holding the smallest, most intricate detailing.

To enhance our wood’s high natural resistance to moisture absorption, decay and insect infestation, every Loewen wood component is treated with a water repellant/wood preservative sealant before assembly.

  • Douglas Fir is North America’s most plentiful softwood species, accounting for one-fifth of the continent’s total softwood reserves.
  • Roughly 88% of the Douglas Fir purchased by Loewen comes from forestland that is Sustainable Forestry Initiative (SFI) certified. In addition to SFI certification, many of our Douglas Fir suppliers in Canada are ISO 14001 and/or CSA certified.
  • Douglas Fir — different, durable. The ideal species for fenestration and a hallmark of the Loewen brand.
  • Windows and doors are active components. They are opened and closed — even slammed! Tight, stable joinery and the ability of fasteners and hardware to remain solidly attached are key factors in a long, dependable working life for your home’s fenestration.
Douglas Fir Durability
  Specific Gravity (density) Impact Strength (drop height causing complete failure) Compression Strength (parallel to grain) Compression Strength (perpendicular to grain) Hardness (load perpendicular to grain) Resistance To Decay
  Weight/
Volume
Inches Psi Psi lbs USFS Grade
Douglas Fir 0.48 31.0 7320 800 710 Moderate
Western Hemlock 0.45 23.0 7200 550 540 Slightly to nonresistant
Ponderosa Pine 0.40 19.0 5320 580 420 Slightly to nonresistant

Source: United States Department of Agriculture, Forest Service, Wood Handbook, Table 3-10


Douglas Fir Fastener Retention This chart shows the force required to remove fasteners.
  Nail Screw Hinge
Douglas Fir 189 lbs 527 lbs 733 lbs
Ponderosa Pine 98 lbs 392 lbs 486 lbs

Source: MacMillan Bloedel Research