What is the minimum thickness for OSB for a tile roof? 3/4 plywood is the norm for tile here in Florida OSB stamp says 19/32?
7/16" is the minimum in FL for 24" OC, unless the tile manufacturer says otherwise. 19/32 is standard nominal 5/8" OSB…should be ok. Who puts 3/4" on a roof deck anyway? That’s pretty rare.
The trusses should be engineered for a tile roof.
Problems with OSB are mostly associated with lack of H clips on a composition roof and deflection of the OSB which is visible in common asphalt composition roofs in the hot Florida environment.
Keep it ventilated well…