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Corridor walls shall extend from the top of the foundation or floor below to one of the following:
  1. The underside of the floor or roof sheathing, deck or slab above.
  2. The underside of a ceiling above where the ceiling membrane is constructed to limit the passage of smoke.
  3. The underside of a lay-in ceiling system where the ceiling system is constructed to limit the passage of smoke and where the ceiling tiles weigh not less than 1 pound per square foot (4.88 kg/m2) of tile.

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