FOR atriums...
404.6 Enclosure of atriums. Atrium spaces shall be separated
from adjacent spaces by a 1-hour fire barrier constructed
in accordance with Section 707 or a horizontal
assembly constructed in accordance with Section 711, or
both.
Exceptions:
1. A fire barrier is not required where a glass wall
forming a smoke partition is provided. The glass
wall shall comply with all of the following:
1.1. Automatic sprinklers are provided along
both sides of the separation wall and doors,
or on the room side only if there is not a
walkway on the atrium side. The sprinklers
shall be located between 4 inches and 12
inches (102 mm and 305 mm) away from
the glass and at intervals along the glass
not greater than 6 feet (1829 mm). The
sprinkler system shall be designed so that
the entire surface of the glass is wet upon
activation of the sprinkler system without
obstruction;
1.2. The glass wall shall be installed in a gasketed
frame in a manner that the framing
system deflects without breaking (loading)
the glass before the sprinkler system operates;
and
1.3. Where glass doors are provided in the glass
wall, they shall be either self-closing or
automatic-closing.