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