406.1.1
Classification.
Buildings or parts of buildings classified as Group U occupancies because of
the use or character of the occupancy shall not exceed 1,000 square feet (93
m2) in area or one story in height
except as provided in Section 406.1.2. Any building or portion thereof that
exceeds the limitations specified in this section shall be classified in the
occupancy group other than Group U that it most nearly resembles.
406.1.2
Area increase. Group U
occupancies used for the storage of private or pleasure-type motor vehicles
where no repair work is completed or fuel is dispensed are permitted to be
3,000 square feet (279 m
2) when the following
provisions are met:
1. For a mixed occupancy
building, the exterior wall and opening protection for the
Group U portion of the building shall be as required for the major occupancy of
the building. For such a mixed occupancy building, the allowable floor area of
the building shall be as permitted for the major occupancy contained
therein.
2. For a building
containing only a Group U occupancy, the
exterior wall shall
not be required to have a
fire-resistance rating and the area
of openings shall not be limited when the
fire separation
distance is 5 feet (1524 mm) or more.
More than one 3,000-square-foot (279
m2) Group U occupancy shall be permitted to be in
the same building, provided each 3,000-square-foot (279
m2) area is separated by fire walls
complying with Section 706.
406.1.3
Garages and carports.
Carports shall be open on at least two sides. Carport floor surfaces shall be
of
approved noncombustible material. Carports not open on at
least two sides shall be considered a garage and shall comply with the
provisions of this section for garages.
Exception: Asphalt surfaces shall be permitted
at ground level in carports.
The area of floor used for parking of automobiles or other
vehicles shall be sloped to facilitate the movement of liquids to a drain or
toward the main vehicle entry doorway.
406.1.4
Separation. Separations
shall comply with the following:
1. The
private garage shall be separated from the dwelling
unit and its attic area by means of a minimum
1/2-inch (12.7 mm) gypsum
board applied to the garage side. Garages beneath habitable rooms shall be
separated from all habitable rooms above by not less than a
5/8-inch (15.9 mm) Type X
gypsum board or equivalent. Door openings between a private garage and the
dwelling unit shall be equipped with either solid wood doors
or solid or honeycomb core steel doors not less than
13/8 inches (34.9 mm) thick,
or doors in compliance with Section 715.4.3. Openings from a private garage
directly into a room used for sleeping purposes shall not be permitted. Doors
shall be self-closing and self-latching.
2. Ducts in a private garage and ducts
penetrating the walls or ceilings separating the dwelling unit
from the garage shall be constructed of a minimum 0.019-inch (0.48 mm) sheet
steel and shall have no openings into the garage.
3. A separation is not required between a
Group R-3 and U carport, provided the carport is entirely open on two or more
sides and there are not enclosed areas above.
406.1.5
Automatic garage door openers.
Automatic garage door openers, if provided, shall be
listed in accordance with UL 325.
