wrote in message
oups.com...
The conventional wisdom that 4" will prevent cupping is most likely
based on 4/4 thickness.

This would scale as 2" for 2/4, 5" for 5/4 etc.

8" for 4/4 is pretty risky; especially if there's a temperature
difference expected through the thickness as in the case of a TV
cabinet.


I think you need to read some wood technology.
http://www.fpl.fs.fed.us/documnts/fp.../fplgtr113.htm is a good
place to start.