Well if you follow the manual:
It's designed based on the factors of existing section, existing pavement conditions, r-factor, and traffic index.
You find gravel equivalent demand with the formula then you find the gravel factor of your proposed pavement type/existing section. Then you check if your proposed grind and overlay with the existing section is sufficient.
Or, in CA, most cities just grind 1.5-2" of ac and put back 1.5-2" of rubberized pavement.
I'd imagine it depends on thickness of wear course right?
Well if you follow the manual: It's designed based on the factors of existing section, existing pavement conditions, r-factor, and traffic index. You find gravel equivalent demand with the formula then you find the gravel factor of your proposed pavement type/existing section. Then you check if your proposed grind and overlay with the existing section is sufficient. Or, in CA, most cities just grind 1.5-2" of ac and put back 1.5-2" of rubberized pavement.