Catalpa Wood Guide 2026
Catalpa speciosa
Catalpa is a soft, lightweight hardwood with surprisingly good natural decay resistance. Its grayish-brown heartwood with lavender undertones has a distinctive appearance unlike any other domestic species. Historically planted in fence post plantations for its durability in ground contact, Catalpa is also used for rustic furniture, carvings, and specialty millwork.
Wood Appearance
Natural Grain
Finished Surface
Key Takeaways
- Density: 29 lbs/ft³
- Classification: Hardwood
- Origin: United States
- Price: ~$4 per board foot
- Common uses include Fence posts, rustic furniture, carving
Quick Facts
Representative reference values — natural wood varies by growing region, moisture content and individual board.
Durability, Stability & Workability
Texture: Coarse and uneven.
Workability: Very easy to work but prone to fuzziness during sanding.
Fastening: Nails and screws well; pre-drilling generally not required.
Finishing: Absorbs finish easily but requires grain filling for a smooth surface.
Color change: Light grayish-brown heartwood turns slightly darker over time.
Insect resistance: High resistance to decay and termites.
Ratings and published values are representative reference figures. Natural wood varies with growing region, moisture content and individual boards — treat them as guidance, not guarantees.
Common Sizes & Availability
Typical market availability for Catalpa. Lumberama is a sourcing marketplace — actual stock, widths and lengths vary by supplier. Request a quote to confirm what's available for your project.
| Thickness | Rough | Typical surfaced | Typical widths | Common lengths | |
|---|---|---|---|---|---|
| 4/4 | 1" | 13/16" (3/4" common) | Available in narrow to medium random widths. | Random lengths from 6 to 10 feet are typical. | Request this size |
| 5/4 | 1-1/4" | 1-1/16" | Available in narrow to medium random widths. | Random lengths from 6 to 10 feet are typical. | Request this size |
| 8/4 | 2" | 1-3/4" | Available in narrow to medium random widths. | Random lengths from 6 to 10 feet are typical. | Request this size |
- 4/4rough 1"
- Surfaced
- 13/16" (3/4" common)
- Widths
- Available in narrow to medium random widths.
- Lengths
- Random lengths from 6 to 10 feet are typical.
- 5/4rough 1-1/4"
- Surfaced
- 1-1/16"
- Widths
- Available in narrow to medium random widths.
- Lengths
- Random lengths from 6 to 10 feet are typical.
- 8/4rough 2"
- Surfaced
- 1-3/4"
- Widths
- Available in narrow to medium random widths.
- Lengths
- Random lengths from 6 to 10 feet are typical.
Availability notes: Primarily available through local sawmills and specialty rustic wood suppliers.
How lumber sizes are described
- Rough (4/4, 8/4…)
- Hardwood thickness in quarters of an inch as sawn, before surfacing. 4/4 = 1" rough.
- Surfaced (S2S/S4S)
- Thickness after planing. 4/4 typically finishes at 13/16" or 3/4".
- Nominal vs. actual
- Construction lumber is sold by nominal size; a 2x6 measures about 1-1/2" x 5-1/2".
- Random width / length
- Most hardwood is sold as it comes from the log — widths and lengths vary within a range rather than being fixed.
Color & Grain
Color: Grayish brown heartwood with lavender to olive undertones; pale cream sapwood
Grain: Straight to slightly irregular grain with a coarse, uneven texture
Common Uses
- Fence posts
- rustic furniture
- carving
- rail ties
- interior trim
- specialty millwork
Key Characteristics
Also known as: Northern Catalpa, Hardy Catalpa, Catawba, Indian Bean Tree
Availability: Special Order
Advantages
- Janka indentation hardness: 490 lbf
- Heartwood decay rating: Durable
- Sourced from United States
- Affordable pricing
Considerations
- Hardness does not establish decay resistance or structural design strength
Frequently Asked Questions
Alternatives to Consider
Species commonly specified for similar applications when Catalpa is unavailable or over budget.
Related Species
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