Inspections

USING THE UL FIRE RESISTANCE DIRECTORY

THE FIRE RESISTANCE DIRECTORY UTILIZES AN ALPHA-NUMERIC NUMBERING SYSTEM

THROUGH PENETRATIONS

THE FIRST LETTER REPRESENTS WHAT IS BEING PENETRATED:

F = FLOORS
W = WALLS
C = FLOORS OR WALLS
(COMBINED)
THE SECOND LETTER(S) PROVIDE MORE INFO ABOUT THE FLOOR OR WALL:

A. CONCRETE FLOOR 5” OR LESS

B. CONCRETE FLOOR GREATER THAN 5”
C. WOOD OR FRAMED FLOOR

D. STEEL DECK CONSTRUCTION
E. THRU I, NOT USED AT THIS TIME

J. CONCRETE OR BLOCK WALL 8” OR LESS
K. CONCRETE WALL GREATER THAN 8”

L. GYPSUM WALLBOARD ASSEMBLIES
M. BULKHEADS
N. THRU Z, NOT USED AT THIS TIME
THE FOUR DIGIT NUMBER DESCRIBES THE PENETRATING ITEM:

0000-0999 BLANK OPENINGS
1000-1999 METAL PIPE OR CONDUIT
2000-2999 NONMETALLIC PIPE OR CONDUIT
3000-3999 SINGLE OR BUNDLED CABLE
4000-4999 CABLE TRAYS

5000-5999 INSULATED PIPES
6000-6999 ELECTRICAL BUSWAY

7000-7999 MECHANICAL DUCTWORK
8000-8999 MIXED PENETRATING ITEMS
9000-9999 RESERVED FOR FUTURE USE
EXAMPLE: CAJ 1226

C = FLOOR OR WALL
A = CONCRETE FLOOR 5” OR LESS
J = CONCRETE OR BLOCK WALL 8”
OR LESS
1226 = METAL PIPE OR CONDUIT

JOINT SYSTEMS

THE FIRST TWO LETTERS IDENTIFY TYPE OF JOINT:

FF = FLOOR TO FLOOR
WW = WALL TO WALL
FW = FLOOR TO WALL
HW - HEAD TO WALL
CG = WALL TO WALL USED AS CORNER GUARDS
THE THIRD LETTER SIGNIFIES THE MOVEMENT OF THE JOINT SYSTEM:

S - NO MOVEMENT (STATIC)
D - ALLOWS MOVEMENT (DYNAMIC)
CLASS I - 500 CYCLES/1 CYCLE PER MIN.
CLASS II - 500 CYCLES/10 CYCLES PER MIN.
CLASS III - 500 CYCLES/30 CYCLES PER MIN.
THE FOUR DIGIT NUMBER DESCRIBES THE NOMINAL JOINT WIDTH:

0000-0999 LESS THAN OR EQUAL TO 2"
1000-1999 GREATER THAN 2" AND LESS THAN OR EQUAL TO 6"
2000-2999 GREATER THAN 6" AND LESS THAN OR EQUAL TO 12"
3000-3999 GREATER THAN 12" AND LESS THAN OR EQUAL TO 24"
4000-4999 GREATER THAN 24"
EXAMPLE: HWD 0003

HW = HEAD TO WALL

D = ALLOWS MOVEMENT (DYNAMIC)

0003 = LESS THAN OR EQUAL TO 2"

Firestop System: A specific construction consisting of a fire-rated wall or floor assembly, a penetrating item or items passing through an opening in the assembly, and the materials designed to help prevent the spread of fire, toxic gases and smoke through the openings.

ASTM E-814
: “Standard Method of Fire Tests of Through-Penetration Firestops.”

UL 1479
: “Fire tests of Through-Penetration Firestops.” (equivalent to ASTM E-814)

UL 2079
: “Tests for fire resistance of building joint systems.”

Annular Space
: The distance between a penetrating item and the surrounding opening.

Point of Contact
: When listed on UL system drawing, allows penetrating item to “touch” edge of opening.

Backing Material:
Material used in firestop systems (i.e. mineral wool) to set the depth and provide support for the fill, void material.

“F” Rating
: The time a firestop system prevents the passage of flame through an opening as determined by ASTM E-814 and UL 1479.

“T” Rating
: The time for the temperature on the unexposed surface of the firestop system or any penetrating item to rise 325 degrees Fahrenheit above it’s initial temperature as determined by ASTM E-814 and UL 1479.

“L” Rating
: An optional measurement of the rate of air leakage through test samples resulting from a specified air pressure difference applied across the surface of the test samples.

Intumescent
: A term describing materials which expand significantly (typically 2 to 10 times original volume) when exposed to heat. Intumescent materials are often used as firestops, particularly around combustible penetrants.