Description
Engineered for Clean Lines, Grip, and Lasting Strength
This Cumaru 1×6 Decking Board (Grooved Both Sides) (actual ¾″ × 5½″) combines Cumaru’s rugged density with a profile built specifically for hidden-fastener installations. The dual side-grooves accept T-shaped hidden deck clips, producing a smooth, uninterrupted surface that showcases the species’ red-gold grain movement without visible screws or plug patterns.
Often compared to Ipe, Cumaru delivers high natural durability, slip resistance, insect and rot resistance, and outstanding structural stability — offering a premium hardwood deck at exceptional value.
Signature Cumaru Appearance: Warm Color Variety & Surface Traction
Cumaru is known for its wide spectrum of reddish-gold, amber, and medium-brown tones, with interlocked and occasionally wavy grain that enhances both traction and visual depth. This texture provides excellent natural slip resistance, making it well-suited for high-traffic decks, walkways, and waterfront applications.
To explore real installations and color variation, browse the Cumaru Decking Photo Gallery.
Designed for True Hidden-Fastener Systems
The dual-groove format is ideal for center-field decking runs where clips engage both sides of the board. For perimeter edges, breaker boards, or picture-frame borders, pair this profile with solid Cumaru boards or single-grooved profiles to maintain a consistent, finished look.
For proper spacing, clip alignment, and pressure distribution, follow the BWD Clip Certified Installation Guide and watch the BWD Deck Clips Video.
To compare hidden-fastener options—including CAMO Edge Fastening, DeckMaster Undermount, and face-screw systems—see the Deck Fastening Methods Video.
Built for Harsh Environments & Demanding Conditions
Cumaru’s exceptional density gives it strong resistance to weathering, surface wear, and long-term structural fatigue. Used for generations in South America for earth-contact timbers and commercial walkways, Cumaru routinely performs for decades with minimal upkeep — even in areas with heavy rainfall, high sunlight, coastal exposure, or freeze–thaw cycles.
For deeper detail on Cumaru’s characteristics, performance behavior, and maintenance, visit the Cumaru Decking Page.
Airflow, Drainage & Moisture Planning
Like all Brazilian hardwoods, Cumaru performs best when the substructure allows consistent airflow beneath the decking. Adequate ventilation helps prevent trapped moisture, which can lead to cupping in any dense hardwood.
For a complete explanation of airflow design, drainage planning, and bottom-side moisture behavior, review Ipe & Hardwoods: Drainage & Cupping. Though written for Ipe, the principles apply identically to Cumaru.
Sustainably Managed & Responsibly Harvested
Every Cumaru board comes from responsibly managed forestry operations that prioritize long-term ecological health. Sustainable harvesting maintains forest value, reduces pressure on land conversion, and ensures Brazilian hardwood resources remain protected for generations.
For a deeper look at tropical hardwood sustainability and enforcement practices, explore the Sustainable Ipe Certified Course.
Pair With Heritage Framing for a Fully Matched System
Since Cumaru is significantly denser than standard decking materials, pairing it with an equally strong foundation delivers the best long-term performance. For structural alignment, moisture protection, and consistency across the full deck system, pair your Cumaru boards with Heritage Premium Framing Lumber.
To customize your design and compare layout options, use the Decking Wizard to generate a project-specific plan with fastener, airflow, and species guidance.
See Real Projects Using Cumaru
Explore real-world Cumaru decks in the Cumaru Decking Photo Gallery for inspiration, color variation, and layout ideas.
Get An Accurate Quote!
Get a fast, accurate quote on premium Brazilian hardwoods like Ipe, Cumaru, and Tigerwood—delivered nationwide from our Atlanta lumberyard. We’ll review your project details and get back to you quickly with current pricing, shipping options, and expert material guidance.
Bundle & Save on Complete Cumaru Deck Systems
Pair your Cumaru grooved decking with Heritage Deck Framing and BWD’s recommended hidden-fastener options (BWD Clips, CAMO Edge, DeckMaster Undermount, or surface systems).
Buying fasteners, framing, and decking together ensures matched performance, consistent milling, and streamlined shipping.
Nationwide Shipping Excellence
Brazilian Wood Depot provides damage-free nationwide delivery with full crating, prep photos before departure, GPS tracking, and guaranteed arrival. Learn more in the Nationwide Shipping Guide.
Explore, Compare & Learn More
Not sure which hardwood fits your project best? Try the Decking Wizard or browse the Cumaru Photo Gallery to see real installations, color variety, and design styles.
