Re: Pre treated sill plate
Here's some good information on treated wood.
Treated Wood and the 2006 IRC
And some more info about teated wood and the use catagory. There is a stamp on the wood somewhere with this info on it.
Treated Lumber Use Codes
Use Category Brief Description
UC1 Interior Dry
UC2 Interior Damp
UC3A Exterior Above Ground, Coated with Rapid Water Runoff
UC3B Exterior Above Ground, Uncoated or Poor Water Runoff
UC4A Ground Contact, General Use
UC4B Ground Contact, Heavy Duty
UC4C Ground Contact, Extreme Duty
UCSA Marine Use, Northern Waters (Salt or Brackish Water)
UCSB Marine Use, Central Waters (Salt or Brackish Water)
UCSC Marine Use, Southern Waters (Salt or Brackish Water)
UCFA Interior Above Ground Fire Protection
UCFB Exterior Above Ground Fire Protection
Hope this helps!