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Why Choose Cumaru for Deck Railing
A Cumaru deck railing is the smart way to complete a Cumaru deck project — or any deck where best-value premium railing is the goal. Brazilian Teak railing at 3,330 Janka provides structural strength virtually identical to Ipe for railing applications, while costing less per linear foot. For the typical railing run around a deck perimeter, the savings are meaningful.
Cumaru railing extends the warm golden-brown to reddish-tan tones of your Cumaru deck up through the perimeter, creating a cohesive design from floor to cap rail. Matching species for deck and railing is the single biggest design upgrade homeowners can make — it transforms a deck from "assembled from parts" to "designed as a system."
At 3,330 Janka, Cumaru balusters and rails are structurally equivalent to Ipe for railing purposes. The railing components resist warping, bowing, and loosening for 50+ years. Like Ipe, Cumaru railing is warm to the touch year-round — a daily advantage over cold aluminum and impersonal cable systems. No painting, no rust, no corrosion — just hardwood beauty and strength for decades.
Complete your deck with matching railing → Shop Cumaru Decking
Build Your Cumaru Railing System
Posts
4x4 standard posts. 6x6 heavy/gate posts. Structural anchoring required — set into framing or surface-mount with hardware.
Sizes: 4x4 (via Fencing)
Shop Cumaru Posts →Top Rail
2x4 standard top rail. 2x6 wide cap rail for a finished top edge. Continuous run for strength and graspable profile for stairs.
Sizes: 2x4, 2x6
Shop Cumaru Rails →Balusters
2x2 standard vertical balusters. 1x1 slim balusters for a lighter, more open look. Space 4" max per code (sphere test).
Sizes: 1x1, 2x2
Shop Cumaru Balusters →Bottom Rail
2x4 bottom rail keeps balusters aligned and secured at the base. Same material as top rail for consistent appearance.
Sizes: 2x4
Shop Cumaru Rails →Need posts? Cumaru 4x4 and 6x6 posts are available in our Fencing & Timbers categories. 4x4 Cumaru Posts • Browse All Timbers
Railing Styles You Can Build with Cumaru
Vertical Baluster Railing
Classic look with vertical 2x2 or 1x1 balusters between posts, plus top and bottom rails. Meets all building codes for residential and commercial use.
Code: 4" max spacing between balusters (sphere test)
Components: 4x4 posts, 2x4 top & bottom rails, 2x2 or 1x1 balusters, optional 2x6 cap rail
Horizontal Rail Railing
Modern look with horizontal 2x2 or 2x4 boards running between posts. Clean, contemporary aesthetic with strong visual lines.
Note: Check local codes — some jurisdictions restrict horizontal infill (climbability concern)
Components: 4x4 posts, horizontal 2x2 or 2x4 infill, optional 2x6 cap rail
Cumaru Railing Specifications
| Botanical Name | Dipteryx odorata |
| Common Names | Cumaru, Brazilian Teak, Tonka Bean |
| Janka Hardness | 3,330 lbf |
| Density | 65 lbs/ft³ |
| Durability Class | Class 1 |
| Fire Rating | Class A (ASTM E84) |
| Rot Resistance | Excellent |
| Insect Resistance | Excellent |
| Expected Lifespan | 50+ years |
| Color (Fresh) | Reddish-brown to golden-tan |
| Color (Weathered) | Silver-gray patina |
| Baluster Sizes | 1x1, 2x2 |
| Rail Sizes | 2x4, 2x6 |
| Post Sizes | 4x4 (via Fencing) |
| Origin | South America (Brazil, Peru, Colombia) |
Code & Installation Guide for Cumaru Railing
Follow standard railing codes: 36" residential height, 42" commercial, 4" max baluster spacing. Post spacing 6' on center. Anchor posts with structural hardware. Pre-drill all holes with carbide bits. Use stainless steel fasteners. Match Cumaru railing to your Cumaru deck from the same lot for best color consistency. Seal cut ends.
Cumaru Railing vs. The Alternatives
| Feature | Cumaru | Aluminum | Cable | Composite | Vinyl |
|---|---|---|---|---|---|
| Appearance | Rich natural wood | Modern metallic | Minimal, open | Uniform plastic | Plastic |
| Lifespan | 50+ yrs | 30+ yrs | 30+ yrs | 15-25 yrs | 15-20 yrs |
| Warmth/Feel | Warm to touch | Cold metal | N/A (cable) | Plastic feel | Plastic feel |
| Matches Deck | Yes — same species | No | No | No | No |
| Fire Rating | Class A | Non-combustible | Steel cables | Melts | Melts |
| Maintenance | Optional oil | None | Tension adjust | Wash | Wash |
| Customization | Fully custom | Limited | Limited | Limited | Limited |
Cumaru Railing vs Aluminum Railing
Aluminum is cold, metallic, and mismatches wood decking. Cumaru railing matches your Cumaru deck perfectly, feels warm to the touch, and provides equivalent structural performance at a similar price point — with far more beauty.
Cumaru Railing vs Ipe Railing
Ipe is slightly harder (3,684 vs 3,330 Janka) but costs more. For railing, the structural difference is negligible — both exceed code requirements easily. Choose Cumaru for best value or Ipe for matching an Ipe deck.
Learn moreCumaru Railing vs Composite Railing
Composite railing feels plastic, fades unevenly, and melts in fire. Cumaru is genuine hardwood with Class A fire rating, natural warmth, and 2-3 times the lifespan. The tactile difference is noticeable every time you grip the handrail.
Cumaru Railing FAQ
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About Cumaru Wood
Species information & properties
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