Brazilian Cumaru Hardwood Decking — Premium Brazilian Teak
Cumaru (Brazilian Teak) is a dense tropical hardwood with warm reddish-brown tones, naturally resistant to rot, insects and decay, with a 50+ year lifespan and no chemical treatment. Sold in bundles in S4S and grooved hidden-fastener profiles.
Specifications & highlights
- Nominal size: 1x6 (0.75" x 5.5" actual)
- Profiles: S4S (smooth four sides) and grooved for hidden fasteners
- Janka hardness ~3,340 lbf
- Lifespan: 50+ years untreated, no chemicals or preservatives
- Naturally resistant to rot, termites and decay
- Recommended fasteners: 304/316 stainless steel
Frequently asked questions
- How long does Cumaru decking last?
- Cumaru (Brazilian Teak) has an expected lifespan of 50+ years when properly installed. Its extreme density and natural oils give it durability comparable to Ipe without chemical treatments.
- What is the difference between S4S and Grooved Cumaru?
- S4S boards are surfaced on all four sides for traditional face-screw installation. Grooved boards have side grooves designed for hidden-fastener systems, producing a clean, fastener-free surface that is ideal for barefoot areas like pool decks.
- Does Cumaru require maintenance?
- Cumaru is very low maintenance. Left untreated, it weathers into a refined silver-gray patina. To preserve its warm golden-brown tones, apply a UV-protective hardwood oil once or twice per year.
- Is Cumaru resistant to insects and rot?
- Yes. Cumaru is naturally resistant to rot, fungal decay, termites, and other wood-boring insects thanks to its density and natural oils — no chemical treatments required.
- Is Cumaru a good choice for pool decks and waterfront projects?
- Absolutely. Cumaru is dimensionally stable, splinter-resistant, and naturally moisture-resistant, making it ideal for pool surrounds, docks, marinas, and other wet environments.
- How is Cumaru sourced?
- Our Cumaru is sourced from responsibly managed South American forests with certified sustainable practices, ensuring minimal environmental impact.