NOFMA-Certified Unfinished Flooring: What the Grading Standards Actually Mean
- Jul 30
- 4 min read
Walk into any lumberyard or flooring showroom and you'll see grade stamps on bundles of hardwood, but few buyers actually understand what those stamps guarantee. If you're sourcing Unfinished Flooring for a residential job, a commercial build-out, or a large-scale renovation, understanding NOFMA grading is one of the most useful things you can learn before you place an order.
At Olson Floor Supply, we get asked constantly what these grade names actually mean in practice, so this post breaks down the standard in plain language.
What Is NOFMA, and Why Does It Matter?
NOFMA, now operating as the National Wood Flooring Association's (NWFA) grading arm, has set the benchmark for hardwood flooring grading in North America for over a century. A NOFMA certification stamp means a mill's output has been independently inspected against a fixed set of appearance and manufacturing rules not just self-reported.
For buyers, that stamp removes a huge amount of guesswork. Instead of relying on a supplier's marketing language, you can compare boards from different mills using the exact same criteria, which is especially valuable when ordering large volumes of unfinished material that still needs to be sanded and finished on site.
Breaking Down the Grade Categories
NOFMA grades are based primarily on appearance — color variation, knots, mineral streaks, and machining consistency — not structural performance. The main categories buyers encounter are:
Clear: The highest appearance grade available, featuring consistent color, minimal natural variation, and few to no visible knots or character marks. It's the ideal choice for homeowners seeking a clean, refined, and upscale hardwood flooring look.
Select: A step below Clear, Select grade allows for slight color variation and a few small knots or natural character marks. It offers an excellent balance of visual appeal, natural wood character, and affordability, making it a popular choice for both residential and commercial hardwood flooring projects.
No. 1 Common: This grade features more noticeable knots, mineral streaks, and natural color variation, creating a warm, authentic hardwood look with added character. It's a popular option for homeowners who prefer a more rustic or traditional style while still benefiting from the same quality manufacturing standards as higher grades.
No. 2 Common: The most rustic of the standard hardwood flooring grades, No. 2 Common showcases the greatest amount of natural character, including larger knots, pronounced color variation, mineral streaks, and other distinctive wood markings. It's an excellent choice for farmhouse, cabin, reclaimed-style, and other spaces where a natural, lived-in look is part of the design.
It's worth repeating that these grades describe appearance, not strength. A No. 2 Common board is just as structurally sound as a Clear-grade board of the same species the difference is purely cosmetic.
Why Grading Matters Specifically for Unfinished Flooring
Unfinished material puts more responsibility on the buyer and installer, since there's no factory finish masking inconsistencies before the boards go down. Choosing the right grade of Unfinished Flooring up front prevents unpleasant surprises during sanding and staining, when uneven color or unexpected character marks are far harder to correct. Because unfinished boards are sanded and coated on site, grade consistency also affects how evenly stain absorbs across a floor — mixed grades in the same room can lead to blotchy, uneven results after finishing.
Common Misconceptions About Grading
Many homeowners assume that a higher hardwood flooring grade means a stronger or more durable floor, but that's a common misconception. Hardwood flooring grades are based on appearance—not durability. Whether you choose Clear, Select, or No. 2 Common, properly manufactured hardwood flooring is built to meet the same structural performance standards.
Another misconception is that grading is consistent across every manufacturer. In reality, only hardwood flooring produced by NOFMA-certified mills is inspected against uniform, independently verified grading standards. When you purchase flooring from an uncertified manufacturer, labels like "Clear" or "Select" may be based solely on that company's internal grading criteria, which can vary considerably from one mill to another. This makes certification an important factor when comparing hardwood flooring from different suppliers.
How to Choose the Right Grade for Your Project
Start by deciding the look you want to achieve, then choose the hardwood flooring grade that best matches that vision. For a clean, elegant appearance in spaces like formal living rooms or dining areas, Clear or Select grades are excellent choices. If you prefer a more relaxed, lived-in aesthetic with natural wood character, No. 1 or No. 2 Common grades are often a better fit for family rooms, kitchens, cabins, or farmhouse-style interiors.
Budget is another important consideration. Lower hardwood flooring grades are typically more affordable because they make use of a greater range of the wood's natural characteristics, not because they're lower quality.
Regardless of grade, all properly manufactured hardwood flooring meets the same structural standards, allowing you to choose based on appearance and price rather than durability.
Get Expert Guidance on Your Next Flooring Order
NOFMA grading gives you a reliable, independently verified way to compare hardwood flooring across suppliers, and understanding it puts you in a much stronger position as a buyer. If you're planning a project and want help selecting the right grade of unfinished hardwood, Olson Floor Supply is ready to help.
Contact our team today to talk through your project details, request grade samples, or get a quote on certified Unfinished Flooring for your next job — we'll help you order with confidence the first time.
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