Iroko vs. Teak: Why African Hardwood Is Winning the Substitution Argument

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For most of the twentieth century, teak was the default answer to a specific set of problems: outdoor furniture that needs to survive decades of weather, boat decking that won't rot or splinter underfoot, architectural elements that require dimensional stability in humid environments. If you wanted wood that performed in demanding conditions without demanding much back, you specified teak and moved on.

That calculus is changing. Not because teak has gotten worse — it remains an exceptional material — but because the conditions around it have shifted in ways that matter to buyers making real procurement decisions. Supply constraints, price escalation, certification complexity, and a growing regulatory environment around Southeast Asian forestry have all pushed specifiers to look harder at alternatives. Iroko — Milicia excelsa, sourced primarily from West and Central Africa — is the species that consistently comes out ahead in that comparison.

I've sourced Iroko from Cameroon for North American buyers long enough to have watched this shift happen in real time. Here's an honest assessment of where the two species actually stand.

The Technical Case

Iroko and teak share enough properties to make substitution genuinely viable rather than aspirational. Both are large-pored hardwoods with natural oil content that provides inherent weather resistance. Both are dimensionally stable — they move predictably with humidity changes, which matters enormously for outdoor and marine applications where wood is exposed to significant moisture variation. Both finish well and accept oils without raising the grain aggressively.

Property	Teak (Tectona grandis)	Iroko (Milicia excelsa)
Janka Hardness	1,000 lbf	1,260 lbf
Density	~655 kg/m³	~660 kg/m³
Natural Durability	Class 1 (Very Durable)	Class 1–2 (Very Durable)
Dimensional Stability	Excellent	Excellent
Natural Oil Content	High	Moderate–High
Workability	Good (silica content dulls tools)	Good (occasional interlocked grain)
Typical FOB Price Premium vs. Iroko	40–70% higher	—

The hardness figure is worth noting: Iroko is actually harder than teak by a meaningful margin. For applications where surface durability matters — decking, flooring, countertops — this is an advantage, not a compromise. The natural durability ratings are functionally equivalent for most end uses. The oil content difference is real, and means Iroko benefits more from regular oiling in outdoor applications — but this is a maintenance consideration, not a structural one.

Where Teak Still Wins

An honest comparison requires acknowledging what teak does better. The silica content that dulls tooling also gives teak an almost waxy surface feel when freshly machined that many craftspeople and clients associate with quality — it's a sensory cue that carries significant weight in premium markets. Teak's color consistency is also more predictable: the golden-brown heartwood is uniform in a way that Iroko, with its more variable grain patterns and occasional color variation between boards, can't always match.

For marine applications specifically — boat decking, teak and holly flooring — teak has decades of performance data and an established reputation with marine surveyors and insurers. Substituting Iroko in a vessel context requires more documentation and more buyer education than substituting it in a furniture or architectural context.

And for buyers where provenance is part of the product story — "genuine teak" carries marketing weight that "African hardwood" or even "Iroko" doesn't yet match in consumer-facing markets — teak's name recognition is a genuine commercial advantage.

Where the Substitution Argument Is Decisive

Supply Reliability

Myanmar, historically the world's largest teak exporter, implemented a log export ban in 2014 and has faced significant international sanctions pressure since the 2021 coup. Plantation teak from Central America and Southeast Asia fills some of the gap, but plantation material doesn't match old-growth specification for density and oil content. Iroko from the Congo Basin is available at commercial volumes with consistent specification. For a buyer who needs 200+ cubic meters annually with reliable quality and predictable lead times, that supply security matters more than a marginal property comparison.

Price

At 40–70% lower FOB cost for equivalent grade and dimension, the economics of Iroko are difficult to ignore in competitive bid environments. For projects where teak is specified by preference rather than by strict technical requirement, the price differential opens a conversation that increasingly resolves in Iroko's favor.

Regulatory Trajectory

CITES Appendix II listing doesn't prohibit teak trade but adds documentation requirements that complicate procurement. The EU Deforestation Regulation (EUDR) and equivalent frameworks being developed in North America require due diligence documentation on forest of origin. Cameroonian Iroko sourced through FLEGT-licensed exporters carries a documented chain of custody that satisfies these requirements cleanly. Sourcing compliant teak at volume is a meaningfully harder problem.

"The question isn't whether Iroko performs like teak. It does, in every application that matters to most buyers. The question is why you're still paying the premium."

Specifying Iroko Correctly

The substitution only works if the Iroko is properly specified and sourced. A few practical points for buyers making the switch:

Specify heartwood only. Iroko sapwood is not durable and should not be used in exterior or high-moisture applications. A reputable supplier will grade to exclude sapwood for exterior-rated material, but this needs to be in the specification — don't assume it.

Moisture content specification matters more with Iroko than with teak in certain applications. Teak's high natural oil content provides a buffer against movement; Iroko performs best when delivered at the correct moisture content for its end-use environment. For North American interior applications, specify 8–10% MC. For exterior, 12–15% is more appropriate.

Grade consistency is a function of your supplier's proximity to the source. Iroko from direct-source exporters with mill-level relationships will grade more consistently than Iroko aggregated through multiple intermediaries. This is where the sourcing relationship, not just the species selection, determines project outcome.

Henry Atangana is Chief Commercial Officer of Natural International Exports Inc., sourcing and exporting Cameroonian tropical hardwoods including Iroko, Sapelli, Okoume, and Sipo to North American markets on FOB cash-against-documents terms.