The acronym CDX stands for a specific combination of veneer grades and exposure durability ratings used primarily in construction-grade structural plywood. The first letter, C, represents the grade of the veneer on the face side, which allows for certain knots, plugged holes, and minor defects while remaining reasonably sound. The second letter, D, indicates the back veneer grade, which is lower quality and permits larger knots and open defects. The letter X stands for exterior, meaning the panel is manufactured with exterior-grade waterproof or moisture-resistant adhesives, allowing it to withstand temporary exposure to weather during normal construction timelines.
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