Have you ever looked at the stamp on your OSB or plywood and wondered “What’s this for?” Well, wonder no longer!
1. Panel grade
2. Span rating
4. Bond classification
5. Mill thickness
6. Mill number
7. Product standard
8. APA’s performance rated panel standard
9. Performance Category
12. HUD recognition
16. Panel face orientation indicator
If you’d like more information on each of the above terms, check out the APA site at www.apawood.org/apa-trademark.
Meek's Lumber & Hardware Blog 
August 30, 2019 at 5:52 pm
This does explain much. E.g. what is exposure 1—out of how many? What is a Performance Category?
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September 3, 2019 at 8:41 am
Hello Brian,
For more information, I’d suggest visiting the APA website directly at: https://www.apawood.org/apa-trademark. This breaks down the different terms in much more detail.
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