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What to know
about Cumaru
Cumaru (pronounced coo-mah-roo) also known as Brazilian Teak is five times harder than cedar or redwood. It is similar to Ipe in its
high fire rating and durability, but it has a distinctive dark brown color with a reddish hue.
Cumaru is one of the top 5 best tropical hardwoods in the world. Its quality, amazing features, and beauty make it comparable to Ipe, which tops the list. In a few words, Cumaru is a premium hardwood built to impress and, most importantly, to last!
Ipe is always the BEST choice
Why? Here are some reasons…
Hardness
Fire Resistance
Weather &
Water Resistance
Very Low
Maintenance
Long Lifespan
Rot resistance
Hardness
Weather &
Water Resistance
Long Lifespan
Fire
Resistance
Very Low
Maintenance
Rot resistance
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Think BIG with Cumaru
Planters
Siding
Ceiling
Outdoor
Furniture
Outdoor
Furniture
| Cumaru Wood Specifications | |
|---|---|
| Common Name(s) | Cumaru, Brazilian Teak, Tonka Bean Wood |
| Scientific Name | Dipteryx odorata, Dipteryx spp. |
| Distribution | Tropical South America, primarily Brazil, Peru, Bolivia, Colombia, and Venezuela. |
| Tree Size | 100–130 ft (30–40 m) tall with a trunk diameter of 3–5 ft (0.9–1.5 m). |
| Average Dried Weight | 67 lbs/ft³ (1,075 kg/m³) |
| Specific Gravity (Basic, 12% MC) | 0.90 (Basic), 1.08 (12% MC) |
| Janka Hardness | 3,330 lbf (14,800 N) |
| Modulus of Rupture | 27,540 lbf/in² (189.9 MPa) |
| Elastic Modulus | 3,080,000 lbf/in² (21.24 GPa) |
| Crushing Strength | 13,990 lbf/in² (96.5 MPa) |
| Shrinkage | Radial: 5.2% Tangential: 7.8% Volumetric: 12.8% T/R Ratio: 1.5 |
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Color/Appearance: Cumaru heartwood ranges from golden brown to medium reddish brown and gradually darkens with exposure to sunlight and age. The wood often features subtle color variation, dark streaks, and an attractive natural luster that gives finished projects a rich, premium appearance.
Grain/Texture: Cumaru typically has an interlocked grain, though it can occasionally be straight. Its medium to coarse texture and smooth natural finish create an elegant look, making it a popular choice for both residential and commercial applications.
Rot Resistance: Cumaru is rated as very durable and offers excellent resistance to decay, termites, fungal attack, and marine borers. Its exceptional natural durability makes it well suited for demanding outdoor environments, including decks, docks, boardwalks, and waterfront structures.
Workability: Due to its high density and hardness, Cumaru can be challenging to machine and may quickly dull cutting tools. Carbide-tipped blades are recommended, and pre-drilling is advised before installing screws or nails. Despite its hardness, it sands and finishes exceptionally well, producing a smooth, attractive surface.
Common Uses: Cumaru is widely used for premium decking, docks, boardwalks, bridges, pergolas, fencing, outdoor furniture, heavy timber construction, siding, and commercial walkways. Its outstanding strength, durability, and resistance to weather and insects also make it an excellent choice for flooring, stair treads, and other high-traffic interior applications where long-lasting performance is essential.
Complete your outdoor construction project with premium hardware, fastening systems, and finishing products from trusted industry brands like DeckWise® and Simpson Strong-Tie®. Whether you’re building a residential deck, commercial boardwalk, pergola, dock, or siding installation, we provide the professional-grade products needed for a secure, durable, and long-lasting result.
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