Douglas Fir Framing

Premium douglas fir framing boards for residential and commercial projects

Janka

660 lbf

Density

34 lb/ft³

Durability

Structural

Origin

Pacific Northwest

Color

Reddish-tan

Overview

Douglas Fir is the gold standard for structural framing lumber in western North America. Its exceptional strength-to-weight ratio, stiffness, and nail-holding ability make it the preferred species for joists, rafters, headers, beams, and load-bearing walls. Douglas Fir consistently outperforms other softwoods in structural grading, making it the top choice for engineered and high-performance construction.

Learn more about this wood species on our Douglas Fir wood guide.

Benefits of Douglas Fir Framing

Highest strength-to-weight ratio of any North American softwood

Superior stiffness — ideal for long-span joists and rafters

Excellent nail and screw holding power

Consistent grading and availability in structural dimensions

Naturally more resistant to decay than spruce or pine

Available in long lengths up to 24 feet

Sizes Available

2x4

2x6

2x8

2x10

2x12

4x4 Posts

4x6 Beams

6x6 Timbers

6x8 Beams

Custom Timber Sizes

Custom sizes and lengths available. Request a custom quote.

Installation Tips

Check moisture content — framing lumber should be 19% or below (KD-HT stamp)

Crown all joists and rafters with the crown side up

Use joist hangers and hurricane ties per code requirements

Pre-drill near board ends to prevent splitting with large fasteners

Stack and sticker lumber to allow air circulation during storage

Follow local building codes for span tables and load requirements

Maintenance

Structural Douglas Fir framing requires no maintenance once enclosed within walls, floors, and roofs. Exposed framing (such as post-and-beam construction) should be treated with a preservative or UV-protective finish. Keep framing dry during construction to prevent mold and warping.