(1)
Table 9.10.8.1. does not apply to
(a)
a dwelling unit that has no other dwelling unit above or below it,
(b)
houses with a secondary suite, where the floor framing is protected on the underside by a continuous smoke-tight barrier of not less than 15.9 mm thick Type X gypsum board, or
(c)
a dwelling unit that is not above or below another major occupancy.