Standards

CDX Plywood Explained: What C-D-X Means and Why It Is Not a Form Panel

CDX plywood is a sheathing panel with a C-grade face, a D-grade back and an Exposure 1 bond. The X is not Exterior, and CDX is not a concrete form panel.

Plywood Exposure 1 Explained: APA Moisture Durability vs Exterior

Exposure 1 plywood is an APA bond/moisture-durability class for construction delays—not Exterior long-term weather, not a face grade, and not a waterproof claim.