Solid Hardwood Species, Explained What it means • How it's reported • Why it matters
Species identifies the wood used throughout the solid plank, determining its color, grain pattern, Janka hardness, and how much it moves with humidity changes. Reference-only: no product recommendations.
Species controls the visible appearance, hardness (Janka value), staining behavior, and seasonal movement characteristics of a solid hardwood floor.
What it is
Species identifies the tree from which solid hardwood boards are milled. In solid hardwood, the entire board — all the way through — is the same wood. This differs from engineered hardwood where the species label refers to a thin veneer over a different core material.
Common domestic species in the US include red oak (the most widely installed hardwood, ~1290 lbf Janka), white oak (~1360 lbf, trending for its neutral color and ray fleck in quartersawn), hard maple (~1450 lbf, light and uniform in appearance), hickory (~1820 lbf, dramatic color and grain variation), and walnut (~1010 lbf, naturally dark brown). Cherry (~950 lbf) and ash (~1320 lbf) are also commonly specified.
Exotic species — Brazilian cherry (Jatoba, ~2350 lbf), Australian cypress (~1375 lbf), Santos mahogany (~2200 lbf), and others — offer different aesthetics and hardness levels. Availability, environmental certification, and dimensional stability vary by species and source region.
How it's reported
Specifications list the common name (e.g., "red oak" or "white oak") and sometimes the botanical name (e.g., Quercus rubra) for precision, especially when exotic species could be confused with domestic alternatives. For exotics, botanical names matter because common names vary regionally.
Janka hardness values are often listed alongside species for comparison. Keep in mind that Janka values can vary slightly across data sources due to natural wood variation, moisture content at time of testing, and which reference database was used.
NHLA (National Hardwood Lumber Association) grading rules reference species as the basis for visual grade standards. The cut orientation (plain-sawn, quartersawn, rift-sawn) is a separate specification from species.
Why it matters
Species is one of the most consequential specifications for solid hardwood because it simultaneously drives appearance, durability, movement behavior, and cost. Selecting species requires balancing all four dimensions for the project conditions.
Hardness (Janka value) indicates how well the wood itself resists denting from furniture legs, heels, and impact. High-traffic commercial applications or households with large dogs benefit from harder species. Note that Janka measures the wood — the finish still provides the primary scratch protection regardless of species hardness.
Movement behavior varies by species. Each wood type has its own shrinkage coefficient, which determines how much a board expands and contracts across its width as humidity changes seasonally. Species with higher coefficients need stricter humidity control, especially in wide plank formats. Quartersawn cuts from any species reduce width movement by roughly 40–50% compared to plain-sawn.
FAQ
Does species determine how much a solid hardwood floor moves? ⌄
Yes, partly. Each species has its own shrinkage coefficients — tangential (across the growth rings) and radial (along the growth rings). Plain-sawn boards move tangentially, which is the larger direction; quartersawn boards move radially, which is smaller. Red oak and white oak are moderately stable; domestic species like hickory have higher movement coefficients; some exotics are more stable. That said, in-space humidity control has a bigger practical impact on seasonal gapping than species choice alone.
Are exotic species harder than domestic hardwoods? ⌄
Not universally. Janka hardness varies widely across both exotic and domestic species. Brazilian cherry (Jatoba) is very hard at ~2350 lbf, but domestic hickory is ~1820 lbf and hard maple is ~1450 lbf — both harder than many exotics. Red oak (1290 lbf) and walnut (1010 lbf) are softer than those exotics. Checking published Janka values for specific species is the right approach rather than assuming exotic equals harder.
Does species affect how the floor takes stain? ⌄
Yes, significantly. Open-grain species like red oak, white oak, and ash absorb stain evenly and are easy to color uniformly. Tight-grain species like maple and cherry are notoriously difficult to stain evenly — maple especially tends to blotch unless conditioned first or stained very lightly. Walnut is naturally dark and often used uncolored. If stain color is important to the design, species choice should be part of the early specification conversation.
Is quartersawn the same species as plain-sawn? ⌄
Yes — quartersawn refers to how boards are cut from the log, not a different species. Quartersawn white oak is the same species as plain-sawn white oak but displays a distinctive ray fleck grain pattern and moves about 40–50% less across its width with humidity changes. Both cuts are available in most major domestic species. Cut orientation is listed separately from species in product specifications.
Related specs
This page provides general reference information about species for solid hardwood flooring. It does not constitute installation advice, professional recommendations, or endorsement of any product.