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SECTION 717 CONCEALED SPACES
717.3
Draftstopping in floors. In combustible construction,
drafts topping 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 0.5-inch (12.7 mm) gypsum board,
0.375-inch (9.5 mm) wood structural panel, 0.375-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-l, R-2, R-3 and R-4. Draftstopping
shall be provided in floor/ceiling spaces in Group R-l 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, drafts topping
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.
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