Cumaru vs Massaranduba Decking

This is a close matchup. Cumaru is harder on the surface (3,540 vs 3,190 Janka) — better for scratch and dent resistance. But Massaranduba is denser (67 vs 66 lbs/ft³) — slightly better for rot resistance and dimensional stability. Both are Class 1 durable species with 50+ year lifespans. In practice, the durability difference is marginal — both are elite performers.

Cumaru offers a warm two-tone golden-to-reddish-brown color that many find attractive for its natural variation. Massaranduba delivers a deep, rich, uniform reddish-brown — sometimes called 'Brazilian Redwood' for its color similarity to redwood but with vastly superior durability. If you want warm variety, choose Cumaru. If you want deep, consistent red-brown, choose Massaranduba.

Cumaru and Massaranduba are typically priced within 5-10% of each other — the most evenly matched pair in the exotic hardwood lineup. With identical 50+ year lifespans, the cost-per-year calculation is effectively identical. Your choice between these two should be driven by appearance preference and specific climate needs rather than cost.

Both species are demanding to install — high density means mandatory pre-drilling, carbide blades, and experienced labor. Massaranduba is slightly denser which can make cutting marginally slower, but it's also known for being slightly more brittle — pre-drilling is even more critical to prevent splitting. Both require professional-grade installation techniques.

Massaranduba's extreme density (67 lbs/ft³ — nearly as dense as Ipe) gives it a slight edge in the harshest freeze-thaw environments. In extreme cold (Minnesota, Upstate New York, mountain regions), Massaranduba provides Ipe-level performance. Cumaru handles these conditions well but is slightly more prone to cupping in wet environments due to higher differential shrinkage. In hot, dry climates, both perform similarly.