Cumaru Decking and Siding is real wood with unsurpassed durability and beauty, and available from Brazilian Wood Depot. It’s naturally resistant to rot and decay and virtually maintenance free.*

Cumaru Decking


Species: Dipteryx odorata

Cumaru hardwood (Real Cumaru) is resistant to insect attack and decay. Cumaru decking(Brazilian Teak) can take some time to dry properly due to its propensity to shrink when freshly cut, but does have good stability characteristics once dry. Our friends in South America have been using this hardwood lumber for fence posts and earth contact timbers for generations and brag about its useful life of 100 years. Cumaru is one of the densest woods on the planet and is VERY durable, which makes it ideal for deck building. It is common for a Cumaru tree to reach to 160 feet in height with a trunk diameter of 40 inches.

Other Names and Species

Almendrillo, Amburana, Brazilian Teak, Cumaru Rosa, Imburana de Cheiro, Tonka, Tonka Bean, Tonquin Bean

Cumaru Origin

Central and South America

Cumaru Decking Drying & Shrinkage

Cumaru hardwood is very unstable when used in dry climates and it is prone to shrinkage. It is naturally seasoned and kiln dried as to prevent shrinkage.

Cumaru Decking Appearance

The sapwood of red cumaru hardwood – RealCumaru – hardwood decking lumber is very similar to the heartwood, which ranges from red brown to deep red in color with a tight, even grain. Over time the red cumaru color will “flatten out” slightly. The species has an irregular, slightly interlocked grain and is coarse and wavy in texture. This dense, attractive Brazilian hardwood has the characteristics of ipe, but without the olive-green tone. Cumaru hardwood – RealCumaru – is sometimes referred to as Brazilian teak or southern chestnut.

Cumaru Janka Hardness

3540 Cumaru (Real Cumaru) lumber is only two and a half percent softer than ipe (Brazilian walnut), almost 3 times as hard as Red Oak (1210 Janka).

Cumaru WorkabilityWorkability

A Cumaru decking (Real Cumaru) is constructed of one of the hardest woods on the planet. Cumaru hardwood is difficult to saw and bore and will have a fairly high blunting effect on tools. Where severely interlocked grain is not present, the wood planes to a smooth surface. Because of its high density and oily nature, the wood glues poorly. It nails and screws well; pre-boring is necessary. The dust arising from working Cumaru wood flooring has been known to cause a slight allergic reaction on contact with skin for some people, and as such some care should be taken in installing and preparing this product.


Cumaru hardwood naturally weathers to a beautiful, silver-gray patina. To maintain this rich tone, Messmer’s deck oil with UV inhibitor works best. Application of deck sealers is optional.


Like all lumber supplied by Brazilian Wood Depot, Cumaru meets high standards for social, economic and environmental responsibility.  Visit RealWood.Org for more information about how purchasing this hardwood lumber fuels the economic value and preservation of the South American forests.