Construction supply chain news leans toward executive restructuring, acquisitions, and new partnerships, but the quieter changes happen in the rule books that define what a grade of lumber actually means. Hardwood grading rules, maintained by the National Hardwood Lumber Association (NHLA), govern how buyers and sellers describe quality, and they change through a deliberate process of committee review, convention debate, and member ballot.
A recent round of proposals illustrates how the system works and why it matters. The association advanced three rules changes to a member vote: merging two common grades, tightening thickness tolerances for aromatic red cedar, and removing an ambiguous note for basswood. Each change affects what arrives on a truck and what it costs, which makes the rules process worth tracking for anyone who buys or specifies hardwood.
How Hardwood Grading Rules Are Made
The NHLA Rules Book is the reference standard for hardwood grading in North America. Anyone can propose a change, but the path to publication is long. Proposals are screened at a rules committee meeting, where they need enough support to advance. Surviving proposals go to an open forum at the annual convention, where members debate them in public. Ballots then go out to members, and changes pass only with a two-thirds majority of the votes cast.
From committee to ballot
- A member submits a proposal to the rules committee.
- The committee meets in early summer and votes on which proposals advance.
- Advancing proposals are discussed at an open rules forum during the annual convention.
- Ballots are mailed to members in November.
- Only Active members vote, with one vote per company.
- Changes that clear a two-thirds majority are published in the rules book in January.
Why the process is slow
The pace is intentional. Grading rules sit behind every purchase order, every claim, and every price quote in the industry. A rule change that misstates a tolerance would cost buyers and sellers real money, so the industry trades speed for certainty. The two-thirds requirement and the one-vote-per-company rule keep any single large firm from steering the book.
The process runs alongside the corporate news that dominates trade media. While companies announce key hires and promotions that reshape the sector, standards bodies move at a slower, more deliberate pace, and both kinds of change deserve attention from buyers.
The 2A and 2B Common Grades and the Merger Proposal
The most consequential proposal in the recent round would merge two common grades into one. Under current rules, No. 2A Common requires clear face cuttings with 50 percent of the face clear, while No. 2B Common requires only 50 percent sound wood, meaning structural integrity with no clear requirement. The proposal replaces both with a single 2 Common grade, eliminating 2B Common for every species currently listed in the Rules Book.
Clear versus sound: the practical difference
Clear wood carries no defects on the face and works for visible parts such as cabinet doors and molding. Sound wood is free of decay but may carry knots, stain, and other features that do not affect strength. The two grades serve different markets, and the price gap between them is significant.
Why the change was proposed
The stated reason is enforcement. Sellers were shipping 2B Common on orders written for 2 Common, and buyers expected the 50 percent clear content of 2A. One grade with a clear requirement removes the ambiguity and gives buyers a clear claim when the load does not match the order.
| Grade | Face requirement | Typical uses |
|---|---|---|
| 2A Common | 50% clear | Cabinets, molding, visible furniture parts |
| 2B Common | 50% sound | Structural parts, hidden components |
| Proposed 2 Common | 50% clear | One grade for both uses |
For buyers new to the categories, a practical guide to solid hardwood grades from the flooring trade walks through how these distinctions play out in finished products, from face defects to yield calculations.
Thickness Tolerances and the Miscut Rule
The second proposal tightens thickness rules for aromatic red cedar. Current language allows a variation in thickness of 1/2 inch on 4/4 to 8/4 stock. The proposal replaces that allowance with the Standard Miscut Lumber Rule, which scales the permitted variation with the nominal thickness.
| Nominal thickness | Allowed variation |
|---|---|
| 3/8 to 3/4 inch | 3/16 inch |
| 4/4 and 5/4 inch | 1/4 inch |
| 6/4 and 7/4 inch | 3/8 inch |
| 8/4 to 12/4 inch | 1/2 inch |
| 14/4 to 24/4 inch | 5/8 inch |
Why the cedar rule was changed
The old allowance was loose. A full 1/2 inch of variation on thin stock creates unpredictable yields for millwork and paneling, where cedar is common. The standard miscut rule has been applied to other species for years, and extending it to cedar brings the species in line with the rest of the book.
What tolerance means on the shop floor
Thickness variation shows up immediately in planing and joinery. A cabinet door frame built from stock that varies by 1/2 inch needs more setup time, more waste, and more rework than stock within a 1/4 inch band. Buyers who specify cedar for millwork should confirm which tolerance applies before ordering.
Proposals get their public airing at the convention rules forum, and the format mirrors what happens at industry leadership conferences in other sectors, where open sessions let members question changes before ballots go out.
The Third Proposal and the Ones That Did Not Advance
The third proposal removes a note for basswood that says dormant twig buds are to be considered as burls. The problem is definitional: the Rules Book never defines dormant twig bud, so inspectors apply the note inconsistently. Removing it gives buyers and sellers a cleaner basis for grading basswood faces.
What the rejected proposals reveal
The committee voted down five of twelve proposals, and the rejections show where the industry draws lines:
- A new Rustic category for Standard 1 Common: rejected, keeping the existing grade structure intact.
- A change to walnut grading for 6-foot and 7-foot FAS: rejected, preserving the current cutting method.
- A wane limitation for FAS 1 Face walnut: rejected.
- Adding splits to the defects that sound cuttings must be free of: rejected.
- Redescribing poplar stain allowances: rejected.
The remaining four submissions were duplicates or were withdrawn, leaving the three advancing proposals as the full ballot.
Sales code changes stay under review
The rules committee also discussed sales code changes but decided to research the industry impact before proposing anything. That decision signals that contract language, not just grade definitions, may change in a later cycle, and buyers should watch for it.
Beyond the rules book, government and industry programs shape how hardwood is sourced and certified. The same convention that debates rules hosts a Sustainable Forestry Initiative sawmill workshop, tying responsible sourcing directly to the grading discussion.
How Buyers and Specifiers Can Track Rule Changes
Grading rule changes publish on a fixed cycle, which makes them trackable. The proposals described here were set to appear in the rules book in January after the November ballot, roughly 15 months after the committee first screened them. Buyers who know the cycle can plan around it.
A checklist for staying current
- Follow the association’s bulletin and convention schedule for rules forum dates.
- Read the summary of proposals each cycle, not just the ones that pass.
- Check the published rules book in January for changes that took effect.
- Ask suppliers which grades they ship under the new language.
- Update purchase order templates and spec sheets when grades merge or tolerances change.
Questions to ask your supplier
Ask whether a quoted grade carries a clear or sound requirement, what thickness tolerance applies, and when the supplier last updated its grade library. A supplier who cannot answer those questions has not read the current book.
Associations publish the details, but buyers who track construction industry changes through newsletters, bulletins, and trade press catch the updates before they show up on invoices.
What the Changes Mean for Builders and Buyers
The practical takeaway is straightforward: grades are moving toward simpler, enforceable definitions. If the merger passes, ordering 2 Common will guarantee a 50 percent clear face, and the old practice of substituting sound cuttings on a clear-grade order becomes a documented violation rather than an ambiguity.
Three changes to plan around
- 2 Common replaces 2A and 2B: expect clearer claims and fewer substitution disputes.
- Cedar thickness follows the standard miscut rule: verify tolerances before millwork orders.
- Basswood grading drops the undefined burl note: cleaner disputes over face defects.
Timing matters. The ballot runs in November, and any change that passes publishes in January, so a project spec written this year may be governed by different language next year. Buyers should confirm which edition of the rules their purchase orders reference.
Rules changes are one of several forces that shift what materials cost and how they behave on site, and the same way leadership changes affect builders through pricing and availability, grading updates change what arrives on the truck. Watching the rule book is cheap insurance for anyone who buys hardwood.