Ipe and Cumaru are two of the most popular tropical hardwoods used for outdoor decking. Both are exceptionally hard, dense, durable, and naturally resistant to decay. However, there are some differences in hardness, appearance, price, workability, and availability that can make one a better choice than the other for a particular project.
Ipe is slightly harder and is generally considered one of the premium choices for outdoor decks and fences. Cumaru, on the other hand, offers very similar performance at a lower price, making it an attractive alternative to Ipe.
Ipe Wood
Ipe is an extremely hard, dense, durable, and rot-resistant hardwood native to Central and South America. Its heartwood ranges from reddish brown to dark brown and can sometimes contain darker streaks, giving it an attractive appearance for high-end outdoor projects.
Ipe is also commonly known as Brazilian Walnut or Lapacho. Because of its exceptional durability and resistance to insects, moisture, and decay, it is widely used for decking, fencing, outdoor furniture, boardwalks, and other exterior applications.
One of the main advantages of Ipe is its ability to withstand harsh outdoor conditions for many years with relatively little maintenance. However, its extreme hardness also makes it more difficult to cut, drill, and fasten than many domestic hardwoods.
Cumaru Wood
Cumaru is another extremely hard, dense, and durable tropical hardwood native to northern South America. It is commonly known as Brazilian Teak and is widely used for decking, flooring, furniture, cabinetry, heavy construction, and other demanding applications.
Cumaru contains naturally occurring silica, which contributes to its excellent resistance to decay and wear. Its heartwood is generally medium to dark brown, although the color can vary between boards.
Cumaru has characteristics very similar to Ipe, which is why it is often considered one of the best alternatives to Ipe decking. It can provide excellent outdoor performance while typically costing less.
Difference Between Ipe and Cumaru Wood
| Property | Ipe Wood | Cumaru Wood |
|---|---|---|
| Scientific name | Handroanthus spp. (formerly placed in the Tabebuia genus) | Dipteryx odorata |
| Average dried weight | 69 lbs/ft³ (1,100 kg/m³) | 68 lbs/ft³ (1,085 kg/m³) |
| Janka hardness | 3,510 lbf (15,620 N) | 3,330 lbf (14,800 N) |
| Crushing strength | 13,600 lbf/in² (93.8 MPa) | 13,850 lbf/in² (95.5 MPa) |
| Elastic modulus | 3,200,000 lbf/in² (22.07 GPa) | 3,237,000 lbf/in² (22.33 GPa) |
| Radial shrinkage | 5.9% | 5.3% |
| Tangential shrinkage | 7.2% | 7.7% |
| Volumetric shrinkage | 12.4% | 12.6% |
| T/R ratio | 1.2 | 1.5 |
The numbers show how closely these two species compare. Ipe has a slightly higher Janka hardness rating, while Cumaru has slightly higher crushing strength and elastic modulus. In practical outdoor applications, however, both are exceptionally strong and durable woods.
Uses
Ipe is widely used for decks, fences, exterior furniture, boardwalks, tool handles, and other outdoor structures. Its high density and resistance to wear make it particularly suitable for applications that receive heavy foot traffic or constant exposure to weather.
Cumaru is commonly used for decking, flooring, cabinetry, furniture, heavy construction, docks, tool handles, and other structures where strength and durability are important.
Both woods have excellent natural resistance to decay and insects, making them suitable for outdoor environments. Their hardness also gives them excellent resistance to scratches and dents, which is one reason they are frequently used for flooring and decking.
Ipe or Cumaru: Which Wood Is Best for Decking?
If budget is not the main concern, Ipe is generally the better premium choice for decking. It is slightly harder than Cumaru and has an excellent reputation for durability, stability, and long-term outdoor performance.
Ipe’s dense structure allows it to withstand moisture, heavy foot traffic, insects, and changing weather conditions. It can also last for decades when properly installed and maintained.
However, Cumaru should not be considered a low-quality substitute. It offers very similar characteristics and is also an excellent choice for outdoor decks. For homeowners who want the appearance and durability of tropical hardwood while keeping material costs lower, Cumaru can provide excellent value.
Neither wood necessarily needs a finish for basic weather resistance. However, if you want to maintain the original brown color, applying an appropriate UV-resistant decking finish can help slow the natural graying process.
Which Wood Is Easier to Work With?
Neither Ipe nor Cumaru is particularly easy to work with. Both are extremely hard and dense, and their irregular or interlocked grain can make cutting, drilling, and machining challenging.
When working with either species, use sharp, high-quality tools and expect to replace or sharpen cutting tools more frequently than you would when working with softer woods. Predrilling is also commonly recommended before installing decking screws because of the density of these hardwoods.
Their hardness can also make installation more labor-intensive. This is an important factor to consider when comparing the total cost of an Ipe or Cumaru deck, rather than looking only at the price of the boards.
If you want to stain either Ipe or Cumaru, the surface should be properly prepared before applying the finish. A suitable exterior wood finish can enhance the appearance and help preserve the wood’s original color.
How Hard Are Ipe and Cumaru?
Ipe has a Janka hardness rating of 3,510 lbf (15,620 N), while Cumaru has a rating of 3,330 lbf (14,800 N).
This means Ipe is slightly harder than Cumaru, although both are among the hardest commercially available woods. To put their hardness into perspective, here are some other popular hardwoods:
| Wood Species | Janka Hardness |
|---|---|
| Desert Ironwood | 3,260 lbf (14,500 N) |
| Cumaru (Brazilian Teak) | 3,330 lbf (14,800 N) |
| Kingwood | 3,340 lbf (14,900 N) |
| Ipe | 3,510 lbf (15,620 N) |
| Patagonian Rosewood (Curupay) | 3,630 lbf (16,150 N) |
| African Blackwood | 3,670 lbf (16,320 N) |
| Snakewood | 3,800 lbf (16,900 N) |
| Quebracho | 4,570 lbf (20,340 N) |
The comparison illustrates why both Ipe and Cumaru are so difficult to cut and machine. Their exceptional hardness is also one of the main reasons they perform so well in demanding outdoor applications.
Wood Color and Grain
Ipe heartwood typically ranges from reddish brown to dark brown or blackish brown, and some boards may contain darker streaks. Cumaru generally has a medium to dark brown appearance and can sometimes show reddish or yellowish tones.
Overall, Ipe tends to be darker and more uniform than Cumaru, although the appearance can vary depending on the individual board and species.
Both woods have irregular or interlocked grain patterns with a fine to medium texture. This grain structure contributes to their attractive appearance but can also make machining more difficult.
Like most untreated outdoor wood, both Ipe and Cumaru will gradually turn silver-gray when exposed to sunlight, rain, and UV radiation. This color change is a natural weathering process and does not necessarily mean the wood is deteriorating.
If you want to retain the original brown color, the decking should be regularly maintained with an appropriate UV-resistant exterior finish.
Is Cumaru a Good Alternative to Ipe?
Yes, Cumaru can be an excellent alternative to Ipe.
The two woods have very similar characteristics. Both are extremely hard, dense, durable, and naturally resistant to rot, decay, insects, and outdoor wear.
The biggest advantages of Cumaru are its lower cost and similar appearance and performance. For many homeowners, Cumaru provides a good balance between durability and price.
If you want the hardest and most premium option and are willing to pay more, Ipe is an excellent choice. If you want comparable outdoor performance at a lower material cost, Cumaru deserves serious consideration.
Price and Availability
Cumaru is generally less expensive than Ipe. Depending on the supplier, board dimensions, grade, location, and market conditions, Cumaru can sometimes cost 40–50% less than Ipe.
This price difference can become significant on a large decking project. While Ipe may have a higher initial material cost, both woods can provide excellent long-term value because of their durability and long service life.
Availability can also vary by region and supplier. Before choosing either species, it is worth comparing the cost of the decking boards, fasteners, installation, finishing products, and ongoing maintenance.
Final Verdict: Ipe vs Cumaru
Ipe is the better choice if you want maximum hardness, premium appearance, and outstanding long-term outdoor performance. Cumaru is the better value option if you want similar durability at a lower price.
Both woods are excellent for outdoor decking, so the final decision often comes down to budget, appearance, availability, and installation requirements rather than durability alone.
For a premium deck where cost is less important, choose Ipe. For a durable tropical hardwood deck that offers excellent performance for the money, Cumaru is a very strong alternative.