Carpentry Level 1 Practice Exam

In CDX plywood, what does CDX indicate, and where is it typically used?

Exterior-grade plywood with exterior glue Interior-grade plywood used for cabinetry Marine-grade plywood Decorative plywood used for paneling

Correct Answer:

Exterior-grade plywood with exterior glue

Explanation:

CDX tells you about both veneer quality and adhesive type. The C and D indicate the faces are lower-grade veneers, which means they may have more knots and surface flaws that aren’t desirable for exposed finishes. The X means the plywood is bonded with exterior-grade glue, which holds up better when moisture is present. That combination makes CDX appropriate for exterior exposure or damp conditions, such as exterior wall and roof sheathing or subfloors in moisture-prone areas. It’s not intended for interior cabinetry or high-finish decorative paneling, and marine-grade plywood uses a different specification and waterproofing. So the best fit is exterior-grade plywood with exterior glue, used where moisture exposure is possible.

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