Ipe Decking
Ipe (Handroanthus spp., formerly Tabebuia) is an extremely dense Brazilian hardwood prized for exceptional durability, fire resistance, and a rich dark-brown appearance. Often called "ironwood," it's the premium choice for high-end residential and commercial decks.
Fast Facts
- What Is It?
- Dense tropical hardwood from Brazil (Handroanthus spp.) with natural Class A fire rating and extreme hardness.
- Common Uses
- Premium deck boards, boardwalks, exterior cladding, porch flooring, commercial outdoor spaces.
- Cost Range
- $7.00–$18.00 per linear foot for 1×4 to 5/4×6 depending on grade and source.
- Durability
- 40–75 years with minimal maintenance. Naturally resistant to rot, insects, fire, and UV degradation.
Specifications
| Property | Value |
|---|---|
| Species | Handroanthus spp. (formerly Tabebuia) — Brazilian Ipe / Ironwood |
| Janka Hardness | 3,510 lbf — among the hardest commercially available decking species |
| Fire Rating | Class A (ASTM E84) — same rating as concrete and steel |
| Density | 69 lbs/cu ft — sinks in water; plan for heavy delivery |
| Common Profile | 1×4, 1×6, 5/4×4, 5/4×6 — pre-grooved available for hidden fasteners |
| Sustainability | Source FSC-certified boards from verified legal harvest chains |
Why Ipe is Called "Ironwood"
Ipe's Janka hardness of 3,510 lbf is roughly 10× harder than Western Red Cedar and 3× harder than white oak. This density translates to exceptional resistance to denting, scratching, and wear — ipe boardwalks in high-traffic coastal applications routinely last 40+ years without structural treatment. The same density gives ipe a natural Class A fire rating without any chemical treatment.
Working with Ipe
Ipe demands professional-grade tools. Use carbide-tipped saw blades and router bits. Pre-drill every fastener hole (1/16″ smaller than screw shank diameter) to prevent splitting. Ipe's natural oils can cause dermatitis in some individuals — wear gloves and a dust mask. The oil also prevents adhesives and many coatings from bonding without surface preparation.
Finishing and Weathering
Ipe weathers naturally to a silver-gray patina if left untreated — structurally sound but aesthetically different from the original rich brown. Apply a penetrating hardwood oil (Penofin, DEFY, or similar) within 2 weeks of installation and annually to maintain color. Ipe oil must penetrate — film-forming finishes will peel as ipe expands and contracts.
Frequently Asked Questions
Why is Ipe so expensive?
Ipe's density, extreme hardness, and Class A fire rating place it in a category of its own among deck boards. The wood must be harvested and imported from Brazil, often requiring FSC-certified sourcing for legal trade. Milling and tooling ipe requires carbide blades and sharp bits. The 40-75 year lifespan means the lifetime cost-per-year is competitive with composite and significantly lower than PT or cedar over the same period.
Do I need special fasteners for Ipe?
Yes. Ipe is so hard that all pilot holes must be pre-drilled, and standard nails will not penetrate. Use stainless steel screws (305 or 316) — Ipe's natural tannins are corrosive to other metals. Hidden clip systems designed specifically for hardwood decking are the preferred installation method. Never use galvanized or coated fasteners.
Is Ipe sustainable?
Legal, FSC-certified Ipe from verified Brazilian suppliers is considered sustainable. However, the supply chain is complex — always demand FSC chain-of-custody certification and verify the mill and importer. Illegally harvested Ipe enters the market at lower prices; purchasing it funds deforestation. Ask your supplier for documentation.
Comparisons Featuring This Material
Also Consider
Cedar Decking
Western Red Cedar (Thuja plicata) is a premium natural decking choice valued for its natural decay resistance, dimensional stability, and warm appearance. The go-to natural wood deck board for contractors and homeowners seeking a traditional aesthetic.
Composite Decking
Composite decking combines wood fiber and recycled plastic (PVC or polyethylene) into a board that mimics the look of natural wood with dramatically lower maintenance requirements. The fastest-growing segment of the decking market, with top brands including Trex, TimberTech, and Fiberon.
Pressure-Treated Lumber
Pressure-treated lumber is dimensional softwood (typically Southern Yellow Pine) infused with preservative chemicals under pressure to resist rot, decay, and insect damage. The most common decking and structural lumber for outdoor applications.