Contractor's Guide to Specifying Tigerwood

Dramatic Architectural Appeal

Tigerwood (Astronium graveolens), also known as Goncalo Alves, is famous for its striking, highly contrasting grain pattern. While not as dense as Ipe or Cumaru, it still vastly outperforms domestic softwoods and composites, making it a favorite for custom residential projects.

Physical & Mechanical Properties

Tigerwood offers an excellent balance of workability, moderate weight, and high durability.

Botanical NameAstronium graveolens
Janka Hardness2,160 lbf (9,620 N)
Specific Gravity0.80 (Basic), 0.90 (12% MC)
Modulus of Rupture19,285 psi (133.0 MPa)
Modulus of Elasticity2,393,000 psi (16.50 GPa)
Crushing Strength10,230 lbf/in²
ShrinkageRadial: 4.4%, Tangential: 7.5%, Volumetric: 10.5%
DurabilityVery Durable (Resistant to decay and insects)

Architectural Implications

With a Janka rating of 2,160, Tigerwood is more than twice as hard as Cedar or Redwood. It is dimensionally stable and easier to cut and install than the denser Ipe, making labor costs slightly lower.

Grading & Appearance Expectations

Premium Architectural Grade, prized specifically for its visual characteristics.

Color Variation

Heartwood is a light golden-brown to reddish-brown with irregular black or dark brown streaks (stripes). The contrast between the background and stripes is dramatic but will subtly darken and blend with UV exposure.

Grain Pattern

Typically straight, though occasionally wavy or interlocked. Fine, uniform texture with a high natural luster.

Weathering

If left untreated, it will silver out and the distinct striping will fade into a uniform gray. To maintain the 'tiger' stripes, a high-quality UV-blocking oil must be applied regularly.

Installation Specifications

Acclimation & Storage

7–14 days of on-site acclimation. Sticker the boards to allow airflow. Protect from direct sun, which can cause rapid color shifting before the finish is applied.

Cutting & Machining

Generally good workability. Carbide-tipped blades are recommended, but it is notably easier on tooling than Ipe or Cumaru. Contains natural oils that can occasionally gum up sandpaper.

Fastening Systems

Pre-drilling is recommended to prevent splitting near the ends. 305 or 316 stainless steel fasteners are required. Hidden clip systems work excellently.

End Sealing

Seal all cross-cuts immediately with an aqueous wax emulsion.

Ideal Applications

✓High-end residential decking
✓Architectural rainscreen siding
✓Porch flooring (covered applications protect color)
✓Interior flooring and accents

Limitations & Warnings

⚠Color and striping will fade/darken with UV exposure unless meticulously maintained.
⚠Not rated for extreme structural marine use like Ipe.
⚠May present minor surface checking in extremely dry environments.