Fire-Resistant Joint Systems in Construction: 2021 IBC Overview

 
Fire-Resistance-Rated Joint
Systems: 2021 IBC
 
Presented by: Michael Fiebig, RA, AIA, NCARB, LEED GA, CFPS, CEP
 
Fire-Resistance-Rated Joint Systems – 2021 IBC
 
2
 
In fire-resistance-rated
construction, the joints where
differing systems meet
require fire protection, to the
same degree that the
assemblies require fire
protection. These rules are
found in Chapter 7 of the IBC
(2021 edition used for this
presentation), Section 715
 
Fire-Resistance-Rated Joint Systems – 2021 IBC
 
3
 
Fire-Resistance-Rated joints
shall be installed at rated
assembly intersections that
include the following:
-walls/partitions
-floors
-floor/ceiling assemblies
-roofs
-roof/ceiling assemblies.
 
Ratings need to match, i.e.
a 1-hour joint for 1-hour
assemblies, etc.
 
Let’s look at some of these defined terms.
 
Fire-Resistance-Rated Joint Systems – 2021 IBC
 
4
 
What does ASTM E
1966 require?
 
Fire-resistant joint
systems must be tested!
 
ASTM E 1966 – Standard Test Method for Fire-
Resistive Joint Systems
 
5
 
ASTM E 1966 – Standard Test Method for Fire-
Resistive Joint Systems
 
6
 
Movement Cycling
Test, and Fire
Endurance Test
 
ASTM E 1966 – Standard Test Method for Fire-
Resistive Joint Systems
 
7
 
Integrity Test, Load Application,
and Hose Stream Test.
 
Note: these are similar to the
tests required in the ASTM E
119 test.
 
Example of fire-resistance-rated joint detail
 
8
 
This example is a 2-hour rated
fire barrier joining a concrete
slab-on-ground floor and a 1-
hour rated floor/ceiling assembly
above. Note the top and bottom
of the system require a fire-rated
joint.
 
Example of fire-resistance-rated joint detail
 
9
 
Bottom of wall joint test:
UL BW-S-0002.
 
Can anyone guess what the
“BW” stands for in this
tested assembly?
 
Example of fire-resistance-rated joint detail
 
10
 
Top of wall joint test:
UL HW-D-0262.
 
Can anyone guess what the
“HW” stands for in this
tested assembly?
 
Additional UL Information
 
11
 
From the UL Fire Resistance Directory (2016)
 
This is important, because the wall/partition assemblies
may have different head/sill specifications from the joints.
 
Additional UL Information
 
12
 
Example: 1-hour rated partition UL U465
 
Per the partition assembly, fasteners for the floor/ceiling runners are
to be spaced at 24” o.c. But what if dynamic movement is required?
 
Additional UL Information
 
13
 
Example Head Joint: HW-D-0262
 
The Big Picture
 
14
 
Important take aways:
 
-Fire rated joints are 
separate
 systems, distinct from the rated
assemblies they protect.
 
-A 
tested
 joint system is required to be specified.
 
-If dynamic movement is a relevant factor in the design (ex:
walls that require a slip head track), the details of the joint
system over-rule the details of the standard wall/partition.
 
Thank you!
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Understanding fire-resistance-rated joint systems is crucial in construction to ensure proper fire protection at assembly intersections. This presentation covers the requirements, testing methods, and examples of fire-resistant joint systems as per the 2021 IBC regulations, emphasizing the importance of matching ratings and ASTM E.1966 standards for testing.


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  1. Fire-Resistance-Rated Joint Systems: 2021 IBC Presented by: Michael Fiebig, RA, AIA, NCARB, LEED GA, CFPS, CEP

  2. Fire-Resistance-Rated Joint Systems 2021 IBC In fire-resistance-rated construction, the joints where differing systems meet require fire protection, to the same degree that the assemblies require fire protection. These rules are found in Chapter 7 of the IBC (2021 edition used for this presentation), Section 715 2

  3. Fire-Resistance-Rated Joint Systems 2021 IBC Fire-Resistance-Rated joints shall be installed at rated assembly intersections that include the following: -walls/partitions -floors -floor/ceiling assemblies -roofs -roof/ceiling assemblies. Ratings need to match, i.e. a 1-hour joint for 1-hour assemblies, etc. 3 Let s look at some of these defined terms.

  4. Fire-Resistance-Rated Joint Systems 2021 IBC Fire-resistant joint systems must be tested! What does ASTM E 1966 require? 4

  5. ASTM E 1966 Standard Test Method for Fire- Resistive Joint Systems 5

  6. ASTM E 1966 Standard Test Method for Fire- Resistive Joint Systems Movement Cycling Test, and Fire Endurance Test 6

  7. ASTM E 1966 Standard Test Method for Fire- Resistive Joint Systems Integrity Test, Load Application, and Hose Stream Test. Note: these are similar to the tests required in the ASTM E 119 test. 7

  8. Example of fire-resistance-rated joint detail This example is a 2-hour rated fire barrier joining a concrete slab-on-ground floor and a 1- hour rated floor/ceiling assembly above. Note the top and bottom of the system require a fire-rated joint. 8

  9. Example of fire-resistance-rated joint detail Bottom of wall joint test: UL BW-S-0002. Can anyone guess what the BW stands for in this tested assembly? 9

  10. Example of fire-resistance-rated joint detail Top of wall joint test: UL HW-D-0262. Can anyone guess what the HW stands for in this tested assembly? 10

  11. Additional UL Information From the UL Fire Resistance Directory (2016) This is important, because the wall/partition assemblies may have different head/sill specifications from the joints. 11

  12. Additional UL Information Example: 1-hour rated partition UL U465 Per the partition assembly, fasteners for the floor/ceiling runners are to be spaced at 24 o.c. But what if dynamic movement is required? 12

  13. Additional UL Information Example Head Joint: HW-D-0262 13

  14. The Big Picture Important take aways: -Fire rated joints are separate systems, distinct from the rated assemblies they protect. -A tested joint system is required to be specified. -If dynamic movement is a relevant factor in the design (ex: walls that require a slip head track), the details of the joint system over-rule the details of the standard wall/partition. 14

  15. Thank you!

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