You first have to locate your attic crawl hole or attic door then you have to fi.
Outside access to my attic.
But they do not mention or prohibit exterior access to the attic.
Attic accesses are required for any attic that has a clear ceiling height of 30 inches or more and the opening needs to be a minimum of 22 inches by 30 inches in size.
The international building code irc and the 2017 residential edition of the florida building code fbc r807 1 both state that the attic access must be readily accessible and also provide specs for the size of a ceiling or wall access opening.
2 if i build in my attic 2 bedrooms do i need to have a access door to the outside or some kind of ladder.