Spalted Maple
Spalted maple is not a separate species. It is ordinary maple that has been transformed by fungal activity into something genuinely one-of-a-kind. The dark zone lines, bleached streaks, and unpredictable color shifts that define spalted maple make it one of the most visually compelling materials available for furniture. We use spalted maple for statement live edge tables and surfaces where the figure itself is the focal point of the piece.
Characteristics
Acer spp. (with fungal figure) (Aceraceae (maple family)), a Hardwood with decorative fungal figure. Also known as Spalted maple.
The defining feature of spalted maple is its zone lines: dark, abstract boundaries created where competing fungal colonies establish territorial borders against each other. These lines do not follow growth rings or any predictable pattern, which is what gives spalted maple its distinctive, ink-drawing quality. Beyond zone lines, spalted wood can exhibit pigmentation (colors deposited by fungi), white rot (lighter bleached streaks where fungi have consumed lignin), and combinations of all three. Maple’s naturally pale sapwood provides ideal contrast for these patterns, making the figure read clearly and dramatically. No two boards are alike, and even within a single slab, the figure can shift from calm to explosive.
Indoors, spalted maple is used for Statement dining tables, coffee tables, feature panels. Outdoor suitability: not recommended. Best for pieces where figure is the primary value, especially live edge.
Performance and Strength
Spalting is a form of controlled decay, which means material selection requires more care than with standard maple. Within a single board, you may find both sound, hard wood with excellent working properties and soft, punky zones where fungal activity has progressed too far. The critical timing in sourcing spalted wood is that fungi die when the moisture content drops, so the wood must be dried at precisely the right moment to preserve the figure without losing structural integrity. Sound spalted maple retains most of maple’s mechanical properties, but heavily spalted or degraded areas may need stabilization with thin epoxy or cyanoacrylate before the wood can be machined.
| Property | Value | What It Means |
|---|---|---|
| Janka hardness | 700 to 1,450 lbf | Depends on host species and extent of fungal breakdown |
| Specific gravity | 0.45 to 0.65 | Punky areas can be lighter and less reliable than sound sections |
| Volumetric shrinkage | Variable | Decay changes normal movement behavior |
| Structural integrity | Variable | Extra caution before assigning spalted stock to structural parts |
Where It Comes From
Spalted maple can occur wherever maple grows, which means it shares the broad eastern North American range of both hard and soft maple species. The spalting process depends on specific conditions: the wood needs sustained high moisture, moderate temperatures, and the right mix of fungal species. This happens naturally in logs and downed trees that sit on the forest floor under the right environmental conditions. We source spalted maple domestically through regional mills and specialty dealers who understand how to identify and process this material at the right stage of development.
Typical harvest age: Spalting is not tied to the age of the tree at harvest. It is a post-harvest phenomenon that depends on how the wood is stored and exposed after felling. Logs left in contact with the ground in warm, humid conditions are most likely to develop the zone lines and color shifts that define spalted figure. The challenge is catching the process at the right moment, before the wood deteriorates beyond what is structurally usable.
Sourced domestically from regional mills and specialty dealers. Every piece is selected based on figure quality, zone line definition, and structural soundness. Because spalted maple is inherently variable, selection is a hands-on process.
Cutting and Drying
Spalted maple is most commonly processed as live edge slabs where the full width of the log is preserved to maximize the visible figure. Because the figure can shift dramatically even a fraction of an inch below the surface, the initial surfacing reveals what you are actually working with, which means pattern unpredictability is inherent to the material.
We follow our standard slab drying process: air-dried for up to 18 months, then kiln-dried for a final three months. The kiln step is especially important for spalted wood because it kills any remaining fungal activity and stabilizes the moisture content for furniture use.
Recommended Finishes
- Water-based clear: Locks in contrast with a protective film.
- Lacquer: Protective film that preserves figure.
- Resin/epoxy fills: Stabilizes softer zones and voids.
- Hardwax oil: Natural look, understanding that oils require refresh.
Spalted maple demands more surface preparation than standard maple. Soft or punky zones need to be stabilized with thin epoxy or cyanoacrylate before final sanding, and dusty pockets (grayish-black dust from fungal residue) should be hardened with CA glue to prevent smudging during sanding. Voids can be filled with tinted epoxy for a clean repair. Clear finishes accentuate every inconsistency, so the surface must be uniformly prepared before any topcoat goes on.
Browse all options in our finishes guide.
Care and Maintenance
Daily Care
- Dust with a soft, dry cloth or microfiber.
- For routine cleaning, use a slightly damp cloth, then wipe dry.
- Avoid abrasive sponges and harsh chemical cleaners, especially ammonia-based or silicone-containing products.
- Wipe spills promptly. Use coasters and trivets for heat and water protection.
Environment
- Maintain indoor humidity around 40 to 60 percent to reduce seasonal movement in solid wood.
- Avoid placing the piece near heating vents, fireplaces, or prolonged direct sunlight.
Maintenance Schedule
- Oil-finished surfaces: Refresh (clean, lightly abrade if needed, reapply oil) once or twice per year depending on use.
- Film-finished surfaces (water-based clear, polyurethane, lacquer): Clean gently. Refinish generally only after visible wear or damage.
Repair
- Oil systems: Minor scratches can often be blended by light sanding and re-oiling.
- Film systems: Small scratches may be spot-repaired. Deeper damage may require sanding and refinishing the affected area.
Outdoor Furniture
- Outdoor exposure increases stress on finishes.
- If maintaining original color: plan periodic UV-protective oiling (often annually). Otherwise, allow natural silvering and focus on cleaning and inspection.
- Avoid pressure washing. High-pressure water can erode surface fibers, increase splintering, and shorten finish life.
For more details, see our care and maintenance FAQ.
Sources
- FPL Producing Spalted Wood: Spalting definition and hardwood association
Related Wood Species
Ambrosia Maple
Ambrosia maple, sometimes called wormy maple, is not a separate species.
Hard Maple
Hard maple is one of the densest, hardest domestic hardwoods available and the species we reach for when the design calls for a lighter palette without sacrificing surface performance.
Soft Maple
Soft maple delivers a similar light, clean aesthetic to hard maple with easier workability and a more accessible price point.
Birch
Birch is a strong indoor furniture wood with a light, fine texture and good machining response.
Reclaimed Oak
Reclaimed oak is salvaged from historic structures, including barn beams, warehouse flooring, factory timbers, and architectural elements that may be 100 to 200 years old.
Browse All Wood Species
Compare 21 species by appearance, durability, and best applications.
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