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8.6.5* Required Fire Resistance Rating
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The minimum fire resistance rating for the enclosure of floor openings shall be as follows (see 7.1.3.2.1 for enclosure of exits):
- Enclosures connecting four or more stories in new construction — 2-hour fire barriers
- Other enclosures in new construction — 1-hour fire barriers
- Existing enclosures in existing buildings — 1/2-hour fire barriers
- Enclosures for lodging and rooming houses — as specified in Chapter 26
- Enclosures for new hotels — as specified in Chapter 28
- Enclosures for new apartment buildings — as specified in Chapter 30
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