What Do Sawmills Really Want? Log Size vs. Wood Quality Explained
One concern I hear from time to time is that trees are growing too fast. The thinking goes something like this: modern genetics and intensive silviculture create trees that reach sawtimber size quickly, therefore leading to weaker wood that is of no use to a sawmill.
If that were true, it would suggest that intensively managed forests don’t provide the returns landowners expect, because mills would prefer slower-growing trees with better physical properties.
But the reality is more nuanced.
Understanding what sawmills actually want from a log can help landowners and forest managers make more informed decisions about genetics, spacing, and silvicultural practices.
How Modern Sawmills Are Optimized
Sawmills continuously reinvest in their operations to improve efficiency, reduce costs, and produce the lumber products that are most in demand. Across the Southeastern United States, most logs ultimately end up supplying the dimensional lumber market.
Over the past two decades, many upgraded and newly constructed mills have made a strategic choice: to optimize production around a specific lumber dimension – the 2×4.
Why focus on the 2×4?
Simply put, 2×4 lumber is one of the most widely used building materials in construction and is often the most valuable product per board foot.
To maximize production of this popular dimension, mills must carefully purchase the optimum size log to meet their production goals.
Why Smaller Logs Often Work Better for Mills
Some may believe that the larger the log the better. But that isn’t true because it is actually easier to produce a 2×4 with smaller logs than larger logs.
Inside a modern sawmill, logs pass through multiple cutting systems designed to extract specific lumber dimensions as efficiently as possible. When mills process logs that closely match their target dimensions:
- Fewer cuts are required
- Less waste is produced
- Sawdust and wood chip byproducts are reduced
- Production efficiency improves
For mills optimized to produce 2×4 lumber, appropriately sized logs allow them to maximize lumber output while minimizing waste.
As a result, mills often prefer chip-n-saw (small sawtimber) harvested at younger ages, especially from productive stands.
Image 1: Notice the growth ring differences for these 2x4s that are graded to the same standard. Some 2x4s are significantly older than the others, but that did not improve the grade of lumber.
Do Faster-Growing Trees Produce Lower-Quality Lumber?
There is some truth to the idea that slower-growing trees can have stronger physical properties. However, the real question for mills and landowners is whether those differences outweigh the benefits of higher productivity.
Research suggests that they do not.
A study conducted by International Paper and published through the Southern Regional Extension Forestry (SREF) evaluated logs harvested from both low-productivity and high-productivity stands across multiple age classes. The logs were processed through a sawmill and evaluated for:
- Lumber grade
- Modulus of Elasticity (MOE)
- Modulus of Rupture (MOR)
Researchers found that while slower-growing trees sometimes produced slightly stronger lumber, the increased volume from intensively managed stands often resulted in higher overall returns for landowners.
“…intensive management will provide higher enterprise returns as higher board‐foot volume production overshadows reduction in physical properties.” (Source: Southern Regional Extension Forestry)
In other words, greater productivity leads to higher overall returns.
What This Means for Landowners
Just as sawmills adapt their operations to meet market demand, landowners can optimize their forest management strategies to improve returns.
Today’s mill infrastructure increasingly favors smaller sawtimber logs grown in productive stands. That trend has been building for decades and is likely to continue as mills remain optimized for dimensional lumber production.
However, markets can always evolve.
Because future demand is never guaranteed, the best long-term strategy for landowners is to:
- Use appropriate spacing
- Apply strong silvicultural practices
By focusing on productivity and sound management, landowners position themselves to deliver the right logs at the right time, regardless of how markets change.
How ArborGen Supports Productive Forests
At ArborGen, our focus is helping landowners and forestry professionals grow forests that are both productive and profitable. Through decades of research and breeding, we develop pine seedlings with improved genetics designed to deliver faster growth, stronger performance, and consistent wood characteristics across a wide range of site conditions.
Advanced genetic selections, including our MCP® (Mass Control Pollinated) seedlings, are developed to provide measurable genetic gain in growth, form, and yield. When paired with sound silviculture and thoughtful stand management, these improved genetics help landowners produce more volume per acre while maintaining the flexibility to meet evolving market demands.
As mills continue to optimize around efficiency and dimensional lumber production, productive stands grown with high-quality genetics position landowners to deliver the right logs at the right time – helping maximize both forest value and long-term returns.
At the end of the day, successful forestry is about making informed decisions today that create value for decades to come.
The Bottom Line
The idea that fast-growing trees produce lumber that mills don’t want is largely a misconception.
Modern sawmills are designed to maximize efficiency and produce the products the market demands – most notably 2×4 dimensional lumber. To do that effectively, they often rely on appropriately sized logs from productive forests.
For landowners, that means investing in good genetics, strong management practices, and productive stand will deliver strong returns, both today and in the future.
Blake Sherry, Reforestation Advisor
Blake Sherry joined ArborGen in September 2024 after more than five years in procurement forestry with International Paper and Interfor. He brings expertise in timber acquisition, supply chain logistics, and mill procurement strategies, with hands-on experience optimizing log supply and product mix for operational efficiency. He holds a Bachelor of Science in Forestry from the University of Georgia and is accredited as a Georgia Master Timber Harvester and Alabama Professional Logging Manager.
