SECTION 509 SPECIAL PROVISIONS
509.4 Parking beneath Group
R. Where a maximum one-story above grade plane Group S-2
parking garage, enclosed or open, or combination thereof,
of Type I construction or open of Type IV construction, with
grade entrance, is provided under a building of Group R, the
number of stories to be used in determining the minimum type
of construction shall be measured from the floor above such
a parking area. The floor assembly between the parking garage
and the Group R above shall comply with the type of construction
required for the parking garage and shall also provide a fire-resistance
rating not less than the mixed occupancy separation required
in Section 508.3.3.
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