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Fire barrier walls shall meet the requirements of this chapter and Chapter 4 except as modified by this chapter.
Fire barrier walls shall be continuous from one of the following or a combination thereof:
  1. An exterior wall to an exterior wall
  2. A floor below to a floor or roof above
  3. One fire barrier wall to another fire barrier wall, fire wall, or HC fire wall having a fire resistance rating of not less than that required for the fire barrier wall
Fire barrier walls shall be continuous through all concealed spaces, such as those found above a ceiling, including interstitial spaces.
Afire barrier wall required for an occupied space below an interstitial space shall not be required to extend through the interstitial space, provided that the construction assembly forming the bottom of the interstitial space has a fire resistance rating not less than that of the fire barrier wall.
The fire barrier wall shall be permitted to terminate at an individually protected structural member in the same plane, provided the structural member has a fire resistance rating of not less than that required for the fire barrier wall.
Structural elements supporting fire barrier walls shall have a fire resistance rating of not less than required for the wall except as modified by NFPA 220, Standard on Types of Building Construction, 5.1.2.2.
Openings permitted in fire barrier walls shall comply with the requirements of Sections 4.8 and 7.3.
The total glazing area in fire door assemblies and fire window assemblies shall not exceed 25 percent of the wall common to any room.