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718.1 General.
718.2 Fireblocking.
718.2.1 Fireblocking materials.
718.2.1.1 Batts or blankets of mineral wool or mineral fiber.
718.2.1.2 Unfaced fiberglass.
718.2.1.3 Loose-fill insulation material.
718.2.1.4 Fireblocking integrity.
718.2.1.5 Double stud walls.
718.2.2 Concealed wall spaces.
718.2.3 Connections between horizontal and vertical spaces.
718.2.4 Stairways.
718.2.5 Ceiling and floor openings.
718.2.5.1 Factory-built chimneys and fireplaces.
718.2.6 Architectural trim.
718.2.6.1 Exterior wall coverings containing plastics, metal composite materials (MCM) or high-pressure decorative exterior-grade compact laminates (HPL) panels.
718.2.6.1.1 Locations.
718.2.6.1.2 Foam plastic insulation.
718.2.7 Concealed sleeper spaces.
718.3 Draftstopping in floors.
718.3.1 Draftstopping materials.
718.3.2 Group R.
718.3.3 Other groups.
718.4 Draftstopping in attics.
718.4.1 Draftstopping materials.
718.4.1.1 Openings.
718.4.2 Groups R-1 and R-2.
718.4.3 Other groups.
718.5 Combustible materials in concealed spaces in Type I or II construction.
Section BC 719: Fire-Resistance Requirements for Plaster
Section BC 720: Thermal- and Sound-Insulating Materials
Section BC 721: Prescriptive Fire Resistance
Section BC 722: Calculated Fire Resistance
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718.3 Draftstopping in floors.
In combustible and noncombustible construction, draftstopping shall be installed to subdivide floor/ceiling assemblies in the locations prescribed in Sections 718.3.2 through 718.3.3.
718.3.1 Draftstopping materials.
In noncombustible construction, draftstopping shall be of noncombustible materials. In combustible construction, draftstopping materials shall be not less than 1/2 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.
718.3.2 Group R.
Draftstopping shall be provided in floor/ceiling spaces in Group R buildings. Draftstopping shall be located above and in line with the dwelling 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 installed in the combustible concealed spaces where the draftstopping is being omitted.
      3.   Where laminated wood I-joist assemblies are used, the space between the ceiling and the floor or roof above shall be divided into approximately equal areas not greater than 500 square feet (46.5 m 2 ).
      4.   Draftstopping shall not be required where the structural members within the concealed ceiling space are individually protected on all sides for their full length with materials having the required fire-resistance rating.
718.3.3 Other groups.
In occupancies other than Group R, draftstopping shall be installed so that horizontal floor areas do not exceed 3,000 square feet (278.7 m 2 ).
   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 shall not be required where the structural members within the concealed ceiling space are individually protected on all sides for their full length with materials having the required fire-resistance rating.
718.4 Draftstopping in attics.
In combustible and noncombustible construction, draftstopping shall be installed to subdivide attic spaces and concealed roof spaces in the locations prescribed in Sections 718.4.2 and 718.4.3. Ventilation of concealed roof spaces shall be maintained in accordance with Section 1203.2.
718.4.1 Draftstopping materials.
Materials utilized for draftstopping of attic spaces shall comply with Section 718.3.1.
718.4.1.1 Openings.
Openings in draftstop partitions provided in accordance with Section 1209.2 shall be protected by self-closing doors with automatic latches constructed as required for the partitions.

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