Description
Professional Edge Profile for Clean, High-End Deck Borders
The Cumaru 5/4×6 Decking Board (Grooved One Side) (actual 1″ × 5½″) is purpose-built for polished deck perimeters, picture-frame borders, and stair edges where one side must accept hidden fasteners while the outside face remains flawlessly smooth. Each board features a single precision-milled groove on one edge, allowing it to integrate seamlessly with clip-based systems while maintaining a refined, uninterrupted outer profile.
Durable, Heavy-Duty Profile for Demanding Builds
This thicker 5/4×6 Cumaru profile provides exceptional rigidity, load capacity, and long-term surface stability, making it a reliable choice for commercial decks, residential upgrades, rooftop borders, docks, and multi-level outdoor structures. While traditional decks often benefit from the efficiency of 1×6 Cumaru, builders who want additional structural mass and high-performance stability frequently choose 5/4×6 for its superior strength.
When installed as perimeter boards, fascia-adjacent edges, or stair tread outer runs, this one-sided grooved profile delivers a smooth, uniform border that pairs perfectly with double-grooved field boards. The result is a clean, professional finish with hidden fasteners and no exposed grooves.
Premium Cumaru Material & Compatible Installation Systems
Each board is milled from Premium Grade A Cumaru, known for its extreme hardness, natural rot resistance, insect resistance, and decades-long outdoor lifespan. Cumaru performs exceptionally well in both humid and high-sun climates, delivering long-term value with minimal movement when properly installed.
This profile integrates with the hidden-fastener clip systems featured in our
BWD Clip Certified Installation Guide
and the
Deck Clips Installation Video.
These resources provide detailed guidance on spacing, fastening, and alignment for a truly professional hidden-fastener deck surface.
For additional fastening methods—including the
DeckMaster Undermount System—review the
Deck Fastening Methods Video.
The DeckMaster system is the most fully concealed fastening method available and is ideal for those prioritizing a fastener-free walking surface.
Moisture Control, Ventilation & Long-Term Stability
Like all Brazilian hardwoods, Cumaru benefits from proper ventilation and correct drainage design. To ensure decades of stable performance, review
Ipe & Hardwoods: Drainage & Cupping,
which explains airflow needs, gap planning, and moisture-management best practices that apply equally to Cumaru decking.
Sustainably Harvested & Responsibly Sourced
Brazilian Wood Depot sources Cumaru through responsible forestry programs that emphasize selective harvesting, long-term forest protection, and verifiable chain-of-custody practices. Homeowners and builders who want to understand the environmental benefits of sustainable hardwood sourcing can explore the
Sustainable Ipe Certified Interactive Course,
which also applies to Cumaru and other tropical hardwoods.
Explore Real Projects & Planning Tools
Browse project photos featuring Cumaru borders, picture-framed layouts, and mixed-profile installations in the
Cumaru Decking Photo Gallery.
Use our interactive
Decking Wizard
to generate layout recommendations, structural guidance, and fastener compatibility notes tailored to your project.
The Cumaru 5/4×6 Decking Board (Grooved One Side) delivers the ideal combination of hidden-fastener compatibility, structural strength, and refined edge detailing. It is the professional standard for builders seeking premium performance and a clean, finished perimeter in luxury Cumaru decking projects.
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 Deck Systems
Pair your Cumaru Decking with Heritage Premium Deck Framing and the BWD Exclusive Hidden Deck Clip System for maximum stability, longevity, and visual consistency—engineered specifically for Brazilian hardwood performance.
Nationwide Shipping Excellence
Brazilian Wood Depot provides damage-free nationwide shipping with prep photos, real-time tracking, and guaranteed delivery. Learn about our shipping process in the
Nationwide Shipping Guide.
Explore, Compare, and Learn
Not sure which Cumaru product is best for your project? Use the Decking Wizard or browse real-world examples in the Cumaru Decking Photo Gallery.
