Maple is one of the most commercially important hardwood genera in North America, with Acer saccharum (sugar maple or hard maple) and Acer rubrum (red maple or soft maple) accounting for the vast majority of lumber production. While both are true hardwoods botanically, the industry distinction between hard maple and soft maple reflects real differences in density, workability, and end-use suitability.
Physical Properties
Hard maple (Acer saccharum) stands among the densest and hardest commercially available North American hardwoods. Its Janka hardness rating reaches 1,450 lbf (6,450 N), placing it above white oak and approaching the hardness of tropical species like teak. Density averages 705 kg/m3 at 12% moisture content. The modulus of rupture for hard maple is approximately 109 MPa, and its modulus of elasticity reaches 12.6 GPa, giving it exceptional stiffness - a key reason it was historically favoured for roller skating rinks and bowling alley lanes.
Soft maple, primarily Acer rubrum, registers a Janka hardness of roughly 950 lbf (4,230 N) with a density around 540-610 kg/m3. While softer than its sugar maple cousin, soft maple still outperforms species like cherry and walnut in hardness and wear resistance. Its lower density makes it easier to machine and less prone to burning during routing or sawing.
Both species exhibit low natural decay resistance, rated as non-durable to slightly durable in European EN 350 standards. This means maple requires finishing or preservative treatment for any exterior application. The sapwood of both species is creamy white, while the heartwood of soft maple shows greyish or brownish tones that some markets view as a defect.
Figured Variants
Maple produces some of the most prized figured wood in existence. Birdseye maple, characterised by small circular figures resembling tiny eyes scattered across the grain, occurs naturally in an estimated 1% to 5% of sugar maple trees, with the highest incidence found in the Upper Peninsula of Michigan and parts of Ontario. The exact cause of birdseye figure remains debated among wood scientists, though theories range from genetic mutation to fungal interaction to growing conditions.
Curly maple, also called fiddleback maple or tiger maple, shows a three-dimensional wavy figure caused by undulating grain direction. This variant has been the traditional wood for violin backs since the 16th century, with Stradivari and Guarneri instruments using European curly maple (Acer pseudoplatanus). Quilted maple displays a more billowy, cloud-like figure and fetches some of the highest prices in the veneer market, with premium quilted logs sometimes selling for over $10,000 per tree at auction.
Applications and Global Markets
In North America, hard maple dominates the hardwood flooring market alongside red oak, with maple accounting for roughly 12% of installed wood flooring. Its light colour and uniform texture make it a staple of contemporary and Scandinavian-inspired interiors. The sport flooring industry depends heavily on hard maple - the NBA specifies northern hard maple for all 30 team courts, with the Boston Celtics' parquet floor being perhaps the most famous example.
The musical instrument industry spans continents in its use of maple. North American hard maple serves in electric guitar necks (Fender has used it since 1950), while European sycamore maple (Acer pseudoplatanus) provides backs, sides, and necks for orchestral string instruments. In Japan, Acer mono (painted maple) finds use in traditional joinery and decorative applications, though the domestic supply is limited and Japan imports substantial maple from North America.
Grading and Sourcing
The National Hardwood Lumber Association (NHLA) grading rules treat hard maple and soft maple separately. Hard maple First and Seconds (FAS) grade requires boards at least 6 inches wide and 8 feet long with minimum 83.3% clear-face cuttings. Maple grading also accounts for colour - sap maple is separated from heart maple, with the white sapwood commanding a premium for flooring and cabinetry.
Canada and the United States produce the vast majority of the world's commercial maple lumber, with Quebec, Ontario, New York, Pennsylvania, and Michigan as major producing regions. The European sycamore maple market centres on Germany, Austria, and Romania, where it supplies the violin-making trade. Climate change poses a long-term concern for sugar maple, as the species requires cold winters and is projected to lose significant portions of its current range in the United States over the coming decades.