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Fire Barrier Rating vs. Fire Door Rating

by Brad Keyes, CHSP, on May 13, 2020 1:00:07 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 DoorsFire BarrierDoors

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