Fire-Resistant Joint Systems in Construction: 2021 IBC Overview
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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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 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
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.
Fire-Resistance-Rated Joint Systems 2021 IBC Fire-resistant joint systems must be tested! What does ASTM E 1966 require? 4
ASTM E 1966 Standard Test Method for Fire- Resistive Joint Systems 5
ASTM E 1966 Standard Test Method for Fire- Resistive Joint Systems Movement Cycling Test, and Fire Endurance Test 6
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
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
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
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
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
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
Additional UL Information Example Head Joint: HW-D-0262 13
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
