Traditional lumber processes typically convert ___ percent of a log to structural solid lumber.

Traditional lumber processes typically convert ___ percent of a log to structural solid lumber.

• A. 30
• B. 40
• C. 50
• D. 60

Answer: (B)

Lumber recovery from a log is limited by waste created during sawing and shaping. When a log is cut into boards, kerf loss, trimming, defects, and waste like slabs and other byproducts mean not all of the log can become solid structural lumber. Because of these inevitable losses, only a moderate portion of the log ends up as usable structural boards, while the rest is diverted to byproducts or non-structural uses. That’s why the best choice is the middle-range amount—it reflects the typical yield users encounter in traditional milling, balancing the material kept as solid lumber with the inevitable waste. The lower options would represent an unrealistically high level of waste reduction, and the higher option would imply far less waste than actually occurs in standard practice.

Lumber recovery from a log is limited by waste created during sawing and shaping. When a log is cut into boards, kerf loss, trimming, defects, and waste like slabs and other byproducts mean not all of the log can become solid structural lumber. Because of these inevitable losses, only a moderate portion of the log ends up as usable structural boards, while the rest is diverted to byproducts or non-structural uses.

That’s why the best choice is the middle-range amount—it reflects the typical yield users encounter in traditional milling, balancing the material kept as solid lumber with the inevitable waste. The lower options would represent an unrealistically high level of waste reduction, and the higher option would imply far less waste than actually occurs in standard practice.