Tigerwood Decking: What Contractors Should Know Before Quoting

Tigerwood: Beautiful but Different

Tigerwood (Astronium graveolens), also known as Goncalo Alves, is one of the most visually striking tropical hardwoods available for exterior applications. Its dramatic dark streaking against a warm orange-brown background creates a bold aesthetic that stands apart from the more uniform appearance of Ipe and Cumaru.

Species Profile

Tigerwood sits in the mid-range of tropical hardwood performance metrics. Its Janka hardness of 1,850 lbf places it above most domestic hardwoods but below Ipe and Cumaru. Density ranges from 52–60 lb/ft³, making it somewhat easier to work than the ultra-dense species.

Natural durability is rated as durable to very durable, with good resistance to decay and insect attack. The species performs well in most exterior applications, though it may not match the 40–75 year lifespan expectations of Ipe in extreme exposure conditions.

Color Behavior

The striking tiger-stripe pattern that gives the species its common name is most prominent in freshly milled lumber. Over time, UV exposure will darken the lighter background color while the dark streaks remain, eventually producing a more uniform dark brown appearance. This color convergence typically takes 6–12 months of unfinished exposure.

Homeowners should understand this color evolution before installation. UV-protective oil finishes can slow the process but won't prevent it indefinitely. Some clients choose to embrace the natural weathering; others prefer regular finishing to maintain the contrast.

Installation Considerations

Oiliness: Tigerwood has higher natural oil content than Ipe or Cumaru. This can interfere with finish adhesion if the surface isn't properly prepared. Solvent wiping with acetone or mineral spirits before finishing helps remove surface oils and improves finish penetration.

Pre-Drilling: Required for all fasteners, as with any tropical hardwood. Tigerwood's slightly lower density makes it marginally more forgiving than Ipe, but splitting will still occur without pilot holes.

Staining Around Fasteners: The extractives in Tigerwood can produce dark staining (tannin bleed) around fastener points, especially during the first few months of exposure. Stainless steel fasteners minimize this, but some initial staining is normal and typically weathers away within one season.

Pricing and Availability

Tigerwood typically costs 30–40% less than Ipe, positioning it as a mid-tier option between Garapa and Cumaru. Availability can be inconsistent, so contractors should confirm lead times and stock levels before quoting large projects.