Can 6x6 Glue Lamm Post be installed on the exterior and be exposed to the weather?
It must be an exterior/wet use rated beam, like this one from Boise  If you are going to bury one end of it, it must meet one of the exterior ground contact categories.  You should discuss this with your inspector and list it on your permit submission drawing, so there are no surprises during inspection.

The AWPA rates wood by its usage category, you should pick a glulam assembly that will meet one or more of the various EXTERIOR categories:


  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
UC5A   Marine Use, Northern Waters (Salt or Brackish Water)
UC5B   Marine Use, Central Waters (Salt or Brackish Water)
UC5C   Marine Use, Southern Waters (Salt or Brackish Water) 
UCFA   Interior Above Ground Fire Protection
UCFB   Exterior Above Ground Fire Protection