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      Fire Barrier Rating vs. Fire Door Rating

      by Bob Armbrister, on May 13, 2020 12:00:00 AM

      Q: Is there a standard ratio from the firewall to the fire door (Ex. 2-hour firewall should have a XX min fire door)?

      A: Well, yes and no. Table 8.3.4.2 in chapter 8 of the 2012 Life Safety Code identifies certain fire-ratings of doors and windows in fire-rated barriers. But this table is considered a ‘core’ requirement and can be and often is over-ruled by the occupancy chapters. So, here is my version of Table 8.3.4.2 with my explanation where the Healthcare Occupancy chapters over-rule:

      Fire Barrier

      Hourly Rating Table 8.3.4.2 Fire Door Assembly Rating Existing Fire Door

      Assembly Rating (8.3.4.3 & 8.3.4.4)

      Chapters 18 & 19 Healthcare Occupancy
      Elevator hoistways 2 1 ½ No Difference

      No Difference

      1

      1 No Difference

      No Difference

      ½

      1/3 1¾” solid bonded wood core; or steel-clad; or solid-core steel door; with closure & positive latch No Difference

      Elevator lobby

      1

      1 ¾

      No Difference

      Vertical shafts, including stairs, exit enclosures, and refuse shafts 2 1 ½ No Difference

      No Difference

      1

      1 ¾ No Difference

      ½

      1/3 1¾” solid bonded wood core; or steel-clad; or solid-core steel door; with closure & positive latch

      No Difference

      Fire barriers

      3

      3 No Difference

      No Difference

      2 1 ½ No Difference

      No Difference

      1

      ¾ No Difference No Difference
      ½ 1/3 1¾” solid bonded wood core; or steel-clad; or solid-core steel door; with closure & positive latch

      No Difference

      Horizontal exits

      2 1 ½ No Difference No Difference
      Horizontal exits served by bridges between buildings 2 ¾ No Difference

      No Difference

      Exit access corridors

      1 1/3 1¾” solid bonded wood core; or steel-clad; or solid-core steel door; with closure & positive latch Smoke resistant, 1¾” solid-bonded, wood core, or materials that resists fire for 20 minutes (19.3.6.3.1)
      Smoke barriers 1 1/3 1¾” solid bonded wood core; or steel-clad; or solid-core steel door; with closure & positive latch

      Smoke resistant, 1¾” solid-bonded, wood core, or materials that resists fire for 20 minutes (19.3.7.6)

      Smoke partitions

      ½ 1/3 1¾” solid bonded wood core; or steel-clad; or solid-core steel door; with closure & positive latch

      Smoke resistant, 1¾” solid-bonded, wood core, or materials that resists fire for 20 minutes (19.3.6.3.1)

      You will notice that there are many differences depending on if the door assembly is new, existing, or located in a healthcare occupancy.

      Topics: Fire Barrier Fire Doors Doors

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