717.3 - Draftstopping in floors
In combustible construction, draftstopping shall be installed to subdivide floor/ceiling assemblies in the locations prescribed in Sections 717.3.2 through 717.3.3.
717.3.1
Draftstopping materials.
Draftstopping materials shall not be less than ½-inch (12.7 mm) gypsum
board, 3/8-inch (9.5 mm) wood
structural panel, 3/8-inch
(9.5 mm) particleboard, 1-inch (25-mm) nominal lumber, cement fiberboard, batts
or blankets of mineral wool or glass fiber, or other approved
materials adequately supported. The integrity of draftstops shall be
maintained.
717.3.2
Groups
R-1, R-2, R-3 and R-4. Draftstopping shall be provided in floor/ceiling
spaces in Group R-1 buildings, in Group R-2 buildings with three or more
dwelling units, in Group R-3 buildings with two
dwelling units and in Group R-4 buildings. Draftstopping shall
be located above and in line with the dwelling unit and
sleeping unit separations.
Exceptions:
1. Draftstopping is not required in buildings
equipped throughout with an automatic sprinkler system in
accordance with Section 903.3.1.1.
2. Draftstopping is not required in buildings
equipped throughout with an automatic sprinkler system in
accordance with Section 903.3.1.2, provided that automatic sprinklers are also
installed in the combustible concealed spaces.
717.3.3
Other groups. In other
groups, draftstopping shall be installed so that horizontal floor areas do not
exceed 1,000 square feet (93 m2).
Exception: Draftstopping is not required in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1.
Notes
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