Cumaru Siding
About Cumaru Wood
Cumaru, also known as Brazilian Teak or Golden Teak, is a naturally durable Brazilian timber with a density similar to Ipe. Its consistent golden brown color and moderate cost make it an attractive alternate to more expensive hardwoods such as Teak or Ipe. Cumaru is resistant to rot and decay, making it an excellent choice for exterior applications such as decking. It not only lasts a long time, but has the beauty of an interior hardwood. It outlasts other popular wood decking species such as treated Pine, Cedar, Redwood and Douglas Fir.
ETT stocks standards Cumaru decking (Brazilian Teak) sizes, and offers custom millwork for special profiles or sizes. Cumaru deck facing is partially air-dried (AD), and then kiln-dried (KD) to approximately 15% moisture content for stability. ETT also stocks all the accessories – fasteners, sealers, cleaners, and finishes – to complete your deck
Cumaru FAQ
What grades of Cumaru do you sell?
ETT provides “premium” all heart grade which gives a truly outstanding appearance. Our decking boards come “three sides clear” (one clear face and two clear edges).
Can Cumaru be installed on existing SYP pressure treated framing?
Yes, although we recommend that a professional inspect the integrity of the existing framing to ensure it is stable, usable and passes your current city code requirements. We carry the necessary component parts to frame the undercarriage of Ipe decking.
Can Cumaru be painted?
It is our experience that due to the wood’s density, oily nature and alkalinity, Cumaru does not accept most paints. For more details on painting Cumaru, please contact us to discuss.
How do I maintain that original golden brown, rich color?
Cumaru will weather to a silver patina if you leave it in its natural state. Depending upon your exterior conditions, it can noticeably turn within a few months and can be fully gray within a year. Should you wish to keep the wood rich and golden brown, apply an oil-based UV inhibitor finish specifically designed for hardwoods such as Ipe. There are numerous available brands, and we recommend Messmer’s UV Plus for Hardwood Decks.
Cumaru Siding
Cumaru siding has become an extremely popular choice for residential and commercial buildings. Premium Cumaru siding offers a featured architectural element while lasting many years in service due to its superior technical properties. Siding made out of naturally durable hardwoods have proven themselves time and again. By using a 100% natural wood product, you can recycle and reuse the product at the end of its life cycle.
Please download our Siding Install Diagram to see how each type of siding is installed.

Siding Profiles
- Ship-lap
- Tongue-and-groove
- Eased-edge
- Rainscreen
- Custom profile to fit your project needs
Benefits
- Rot resistant
- No annual Sealer needed
- No chemical treatments
- Provides great architectural interest
- Long Lasting
What Sizes of Cumaru Wood Siding Are Available?
Wood Species Guide
Natural woods vary in performance characteristics from one another. This wood comparison chart helps you compare hardness, weight, fungal resistance, and more. Use the wood comparison guide to help you find the right wood for your project.
Locations
Locations are strategically placed throughout the United States to serve our customers. Products stocked at each location are different based on customer needs.