6 . ENGINEERING JUDGMENTS ( EJ )
At times , a contractor may encounter a unique jobsite condition for a firestopping application which has not been tested and listed . In such cases , customized engineering judgment ( EJ ) firestop details are provided by the firestop manufacturer for a single application or for an entire project to account for these unique applications .
Project name for which EJ is made
ENGINEERING JUDGMENT FIRESTOP DETAIL
PROJECT :
ISSUED TO : Ratings F-RATING = 2-HR .
THIS ENGINEERING JUDGMENT REPRESENTS A FIRESTOP SYSTEM THAT WOULD BE EXPECTED TO PASS THE STATED RATINGS IF TESTED
Customer ’ s / company name
CROSS-SECTIONAL VIEW
2
1 4
3
1 . CONCRETE FLOOR ASSEMBLY ( MINIMUM 4-1 / 2 " THICK ) ( 2-HR . FIRE-RATING ). 2 . ONE OR MORE MAXIMUM 1 " NOMINAL DIAMETER STEEL CONDUIT OR STEEL EMT WITH MAXIMUM 3 / 4 "
THICK AB / PVC INSULATION . 3 . MINIMUM 4 " THICKNESS MINERAL WOOL ( MIN . 4 PCF DENSITY ) TIGHTLY PACKED AND RECESSED TO
ACCOMMODATE SEALANT . 4 . MINIMUM 1 / 2 " DEPTH HILTI FS-ONE MAX INTUMESCENT FIRESTOP SEALANT .
Referenced tested system
NOTES : 1 . MAXIMUM AREA OF OPENING = 40 SQ . IN . 2 . ANNULAR SPACE = MINIMUM 1 / 2 ", MAXIMUM 12 ".
Referenced Tested Systems
Project Application Details
( REFERENCE : UL / cUL SYSTEM NO . C-AJ-8099 & C-AJ-8143 ) CS0182799 Applicable Test Method UL 1479
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Hilti Firestop Systems
Designed by Hilti FPE
Travis Pearce
HILTI , Inc . Plano , Texas USA ( 800 ) 879-8000
Drafter
AN
Sheet
Scale
Date
Saving Lives through Innovation and Education
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1 of 1
3 / 16 " = 1 "
Aug . 17 , 2023
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Drawing No .
602367b
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Applicable test method |
Fig . 6 : Sample EJ provided by Hilti
Per International Firestop Counsel ( IFC ) guidelines , engineering judgments are firestop designs created by qualified personnel based off of third-party tested and approved systems . These designs are in accordance with the recommended IFC guidelines for evaluating firestop system engineering judgments . The International Building Code ( IBC ) justifies the use of engineering judgments as referenced under sections 703.2 Fire Resistance Ratings and 703.3 Alternative Methods for Determining Fire Resistance , IBC 2024 . The testing and rating process ensures that each specifically designed system will maintain or exceed the hourly fire rating , as tested , for which it was approved .
Below are some of the fundamental guidelines recommended by the IFC for evaluating engineering judgments :
• Use tested systems in lieu of EJs when available
• Issued only by qualified technical personnel
• Issued for a single construction project and are not transferable to another job without review by the issuing entity
Inspection Guidebook 13 / 28