Unlike other window makers, we use Coastal Douglas Fir (Pseudotsuga Menziesii) as the standard species 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 — different, durable. The ideal species for fenestration and a hallmark of the Loewen brand.
• Douglas Fir is North America’s most plentiful softwood species, accounting for one-fifth of the continent’s total softwood reserves.
• Nearly 100% of the wood fiber used in the production of Loewen products is derived from forests that are Forest Stewardship Council_^® (FSC_^®) certified, Canadian Standards Association (CSA) certified,  Sustainable Forestry Initiative (SFI) certified, or  Programme for the Endorsement of Forest Certification (PEFC) certified.
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 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

_{Source: United States Department of Agriculture, Forest Service, Wood Handbook}

Douglas Fir Fastener Retention

This chart shows the force required to remove fasteners.

_{Source: MacMillan Bloedel Research - PSL Technical Manual}