Regarding aisle width between library book shelf's(books on both sides). Building is title II municipal building built before 1/26/1992, project is barrier removal.
ADA Standards allows min. width of 36" for accessible routes per 403.5.1
CBC 11B-403.5.1 allows 36" but also has an exception #4 for width serving elements on one side to be 36", serving elements on both sides to be 44".
It was my understanding that title II buildings doing barrier removal only had to comply with the federal law, what do you all think?