What is the minimum DBH for merchantable trees used for saw logs?

What is the minimum DBH for merchantable trees used for saw logs?

• A. 12 inches
• B. 15 inches
• C. 18 inches
• D. 20 inches

Answer: (B)

The size threshold for what counts as merchantable saw log is about ensuring enough wood volume and quality to justify milling into lumber. When a tree reaches a DBH of 15 inches, there’s typically enough trunk circumference to yield a useful amount of boards with acceptable, straight wood and fewer defects. Smaller trees tend to produce logs with less recoverable board feet, more taper, and more knots or defects, making them economically better suited for pulp or smaller products rather than saw logs. So, setting the minimum at 15 inches balances the economics of harvest, processing, and wood quality, which is why 15 inches is the standard used here.

The size threshold for what counts as merchantable saw log is about ensuring enough wood volume and quality to justify milling into lumber. When a tree reaches a DBH of 15 inches, there’s typically enough trunk circumference to yield a useful amount of boards with acceptable, straight wood and fewer defects. Smaller trees tend to produce logs with less recoverable board feet, more taper, and more knots or defects, making them economically better suited for pulp or smaller products rather than saw logs. So, setting the minimum at 15 inches balances the economics of harvest, processing, and wood quality, which is why 15 inches is the standard used here.