Description
Designed for Clean, Professional Perimeter Finishing
The Cumaru 1×6 Decking Board (Grooved One Side) (actual ¾″ × 5½″) is crafted for homeowners and builders who want the refined look of a smooth, uninterrupted outer edge. A single, precision-milled groove allows hidden fasteners to engage on one side of the board while leaving the opposite edge completely flush. This makes it the ideal choice for perimeter framing, picture-frame borders, fascia transitions, and stair edges where exposed grooves are not visually desirable.
Strength, Stability, and Long-Term Performance
Cumaru’s dense, interlocking grain ensures a rigid, load-capable decking surface that performs reliably in both residential and light-commercial settings. While 1×6 is the preferred profile for standard deck builds on 12″, 16″, or 20″ OC joists, many installers choose the grooved-one-side version as a companion board to dual-grooved field boards. It provides the same dependable performance while enabling cleaner edge detailing and consistent hidden fastening throughout the project.
When used along deck borders or around picture-frame layouts, this grooved-one-side board creates a polished, seamless perimeter that enhances architectural lines and improves the overall visual flow of the deck.
Premium Material, Milled for Hidden-Fastener Compatibility
Each board is Premium Grade Cumaru is milled to accept clip-based hidden fasteners on the grooved edge. This profile integrates smoothly with the systems featured in our BWD Clip Certified Installation Guide and Deck Clips Installation Video. These resources provide installers with best-practice spacing, alignment, and fastening instructions for a flawless final appearance.
Moisture Management and Deck Longevity
Hardwood decking requires thoughtful airflow planning to ensure long-term performance. For guidance on drainage, ventilation, and preventing cupping, review Ipe & Hardwoods: Drainage & Cupping. Although written with multiple species in mind, the principles apply directly to Cumaru’s dense structure and natural movement characteristics.
Sustainably Harvested and Responsibly Sourced
Cumaru at Brazilian Wood Depot is ethically sourced through verified forestry programs that promote responsible harvesting, forest regeneration, and long-term biodiversity protection. For those who want a deeper understanding of sustainable hardwood production, explore our Tropical Hardwoods Sustainability Course.
Project Inspiration and Design Tools
See how Cumaru is used in real installations by browsing the Cumaru Decking Photo Gallery. To plan your build, evaluate layouts, and compare fastening methods, try the Decking Wizard for personalized guidance based on your project needs.
The Cumaru 1×6 Decking Board (Grooved One Side) is the ideal finishing board for hidden-fastener decks, delivering clean lines, natural durability, and a professional border finish for projects built to last.
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.
