What is the difference between CDX Plywood and ACX, I want to put down a 1/4\” subfloor for laminate wood, not sure what to get. The kids at the lumberyard don’t know.

The grading system goes like this. A, B, C, and D grade. If you are looking at an ACX plywood you will see a perfect A side with an imperfect C side, and the X stands for eXterior glue. If you are putting down a floating wood floor I would use a minimum of a BCX, and install the B side up. ACX is used for Cabinet construction and CDX is used for Roofing underlayment usually. Hope this helps,

Sincerely, Andy Love

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