Red Maple Moves Toward Structural Markets

New research shows promising potential for one of the most abundant but underutilized hardwood species in North America.

A Widely Available, Underused Resource

Red maple is one of the most common hardwood species in the eastern United States. It grows across a wide range of forest types and is especially abundant in the South and Appalachian regions. Despite its availability, red maple has traditionally been used for appearance-based products such as furniture, cabinets, flooring, and millwork.

Its role in structural applications, however, has remained limited.

At the same time, the wood products industry is undergoing an important shift. Demand for wood in construction is increasing as builders look for more sustainable alternatives to steel and concrete. Engineered wood products such as cross-laminated timber (CLT), glulam, and laminated veneer lumber (LVL) are expanding into new markets.

This shift is creating new opportunities—not just for softwoods, but for hardwoods as well.

Unlocking Hardwood Potential

Many hardwood species, including red maple, have mechanical properties that can compete with or exceed those of commonly used softwoods. However, a key barrier has been the lack of grading systems for evaluating hardwoods’ structural performance.

To address this gap, NHLA is working in collaboration with Michigan Technological University, Mississippi State University, and the USDA Forest Products Laboratory with funding provided by the USDA Forest Service’s Wood Innovations program. The project focuses on evaluating red maple using both traditional visual grading and modern machine-based grading methods.

The goal is simple: to better understand how red maple performs structurally and to determine how grading systems can support its use in construction.

Early Results Show Strong Promise

Initial testing has produced encouraging results.

A sample of kiln-dried red maple lumber from Kretz Lumber Company (Wisconsin) was analyzed at Michigan Technological University. Forty boards were tested for moisture content, density, and stiffness.

Key findings include:

• Moisture content ranged from 7–12%, averaging 10.6%

• Specific gravity ranged from 0.56 to 0.69

• Average stiffness (MOE) measured approximately 1.87 million psi

After adjustment, the estimated static modulus of elasticity is approximately 1.74 million psi.

When grouped by NHLA grade, the data show that even lower-grade material maintains relatively strong stiffness values. This highlights a key issue: appearance grades do not fully reflect structural performance.

Key Industry Implications

These findings carry important implications for the hardwood sector.

1. New Market Opportunities

Red maple has the potential to move beyond traditional markets and enter structural and engineered wood applications. This could open new revenue streams for mills and producers, especially in regions with large red maple inventories.

2. Need for Structural Grading Systems

Current NHLA grading rules are designed for appearance, not strength. Expanding into construction markets will require grading methods that accurately measure mechanical performance.

3. Role of Machine Grading

Technologies such as machine stress rating (MSR) and other non-destructive evaluation methods are showing strong potential. These tools can provide consistent, performance-based grading and support standardization.

4. Increased Value for Low-Grade Lumber

Lower NHLA grades, which often have limited market outlets, may still perform well structurally. This creates an opportunity to add value to material that is currently underutilized.

From Resource to Structural Material

“Red maple is not just an abundant resource—it is an untapped structural opportunity for the hardwood industry.”

This research signals a shift in how hardwoods may be positioned in the future. Rather than being limited to appearance uses, species like red maple can become part of the structural supply chain.

Looking Ahead

The next phase of this work will expand testing to include mills in the southern United States, where red maple is widely available. This will help validate results across different regions, log sources, and processing conditions.

In parallel, efforts will focus on:

• Developing structural grading standards

• Establishing design values for building code acceptance

• Evaluating compatibility with engineered wood products

These steps are critical for bringing hardwood into mainstream construction markets.

The Future of Hardwood in Construction

The long-term outlook is promising.

As demand for sustainable building materials continues to grow, hardwoods have an opportunity to complement softwoods in structural applications. Red maple, in particular, is well-positioned due to its availability, performance potential, and geographic distribution.

For the hardwood industry, this represents a strategic shift:

• From appearance-focused markets

• To diversified, performance-based applications

This evolution could lead to new product lines, improved resource utilization, and stronger market positioning for U.S. hardwoods.

Conclusion

Early results from this research demonstrate that red maple has strong potential as a structural material when evaluated using modern grading technologies.

For producers, manufacturers, and the broader hardwood industry, the message is clear:

Red maple is ready for a larger role.

Author List

Randi Dodgson, Xinfeng Xie, Robert J Ross, Yunxiang Ma, College of Forest Resources and Environmental Science, Michigan Technological University

Laurice Mara Spinelli Correa, Department of Sustainable Bioproducts, Mississippi State University