Douglas Fir Posts, Beams & Rafters
Douglas Fir posts, beams and rafters in kiln-dried, grade-stamped stock for timber frames, trusses, pergolas and heavy timber structures built by contractors and builders.
About Douglas Fir Posts, Beams & Rafters
Douglas Fir is a strong structural softwood with a high strength-to-weight ratio, widely used for posts, beams and rafters as well as timber frame construction, trusses and heavy timber structures. Common grades are Select Structural, No. 1 and No. 2. Stock is kiln-dried and grade-stamped, and very long members are available, up to about 60 ft.
It is not naturally rot resistant. Ground contact or exposed use needs preservative treatment, which is the main difference to weigh against cedar for outdoor work. Lumber is sold by nominal size and actual size is smaller: 4×4 is 3-1/2 x 3-1/2 in, 4×6 is 3-1/2 x 5-1/2, 6×6 is 5-1/2 x 5-1/2, 2×6 is 1-1/2 x 5-1/2 and 2×8 is 1-1/2 x 7-1/4.
Member sizing and grade should come from your plans or engineer. For a quote on Douglas Fir timbers, send a cut list with sizes, lengths, counts, grade and any treatment requirement. Axiom South ships nationwide.
Colors, sizes and specifications
Sizes and configurations
- 4×4 (3-1/2 x 3-1/2 in actual)
- 4×6 (3-1/2 x 5-1/2)
- 6×6 (5-1/2 x 5-1/2)
- 2×6 (1-1/2 x 5-1/2)
- 2×8 (1-1/2 x 7-1/4)
Features
- High strength-to-weight
- Treatment needed for exposure
Specifications
| Availability | Kiln-dried and grade-stamped stock; very long members available, up to about 60 ft |
|---|
Best for
- Timber frame construction, trusses and heavy timber structures
Frequently asked questions
Why do beams get kiln-dried Douglas Fir?
Untreated timbers can contain pitch pockets that ooze resin; kiln-drying reduces this. Stain color varies naturally, so test first.
Douglas Fir Posts, Beams & Rafters photos
One product or the whole package
Order this on its own, with a few related products, or with everything else for the project. One itemized quote, shipped to all 50 states. Need someone to install it? Find an installer serving your area.
Request a quote for Douglas Fir Posts, Beams & Rafters
Send plans, measurements, or photos and we will prepare an itemized quote. You can also call us with questions.