Commish,
Earlier when I wore swaddling clothes I could remember sections and code numbers in the "Book of Code", (UBC), like nobody's business. We use to calculate spans using a formula, and all the surrounding sheep would say "Hey, can I get ahold of one of the span chart sheets, you made? Even the lumberyard wanted a copy.
Then the "Book of Codes" switched to the ICC, and the book got bigger and thicker, hurting my widdle wist when I had to tote em to the codes car. We would skip a code year and the numbers and chapters would get moved around a bit making it harder to remember. Remember when you had to list the code you were laying down on someone, cuz his cousin new a councilman or the mayor, remember those days?
Sonny, I forget where I was going with this. oh ya.. it helps to be able to read a tape measure, talk to people, repeat yourself five times without getting mad keeping your hands down to your sides, re-inspecting, re-inspecting, re-inspecting and makin punch lists for the little feller's that drive trucks that cost more than your first house.
I've always been a multi-code inspector, when you add the current 11 code books together it measures approximately10-inches (254.0mm).
I give up trying to know the whole code.