CDX Grade Plywood and Standard PS1-95

CDX Grade Plywood and Standard PS1-95


The term CDX Grade comes from US voluntary plywood Standard PS1-95, which is based  for Construction and Industrial Plywood established by APA (the American Plywood Association)  – The Engineered Wood Association. "CDX" is not to be confused with a type  of a plywood grade or grading . What  CDX does stand for is  "C-D Exposure 1 plywood" . C-D means that one side of the plywood is rated "C" grade and the other side is rated "D" grade . The letter "X" means the glue of the plywood is exterior glue .


But CDX plywood is not exterior plywood . Because usually the core veneers for CDX plywood are not as good as exterior plywood. CDX plywood is moisture resistant but can not be exposed to water or weather for long time . CDX plywood is a kind of economical plywood . Usually CDX plywood are sanded but not polished . So the face/back of CDX plywood is rough .


Some knots and knot holes exist in the face/back . As construction and industrial plywood, CDX plywood is usually used as wall sheathing, roofing and so on . To patch CDX plywood you can use any standard patching compound to smooth out the surface and even up the edges of the material before or after the installation process.