The abbreviation CDX denotes a specific classification of structural exterior-grade plywood defined by its veneer quality and glue type. The letter C indicates the grade of the front veneer face, which allows for small knots, plugged holes, and minor surface blemishes while remaining structurally sound. The letter D represents the back veneer grade, permitting larger knots and open defects since it is intended to be hidden. The letter X stands for exterior, specifying that the panel is bonded with waterproof or highly moisture-resistant adhesives designed to withstand normal weather exposure during standard construction phases.
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