Online copy of the NJ Building Code states that "Gypsum board shall be
permitted to be used on wood joists to create a horizontal diaphragm
ceiling in accordance with table 2508.5" which then states that 1/2"
Gypsum board used on framing members of 16" o.c. provides 90 plf shear
value, and on 24" o.c. provides 70 plf shear value when used with 1
5/8" wall borad nails or 1 1/4" type S or W screws.

The fire-resistance rated section of the code is simply too confusing
to understand, but they wouldn't have conflicting requirements in the
code book, would they?