Vulcraft Steel Joists and Joist Girders Catalog - Sites at Lafayette

F I R E - R E S I S TANCE RATINGS WITH STEEL JOISTS
ROOF-CEILING ASSEMBLIES WITH DIRECT APPLIED PROTECTION
RoofCovering
Rigid Insulation
Roof Deck
Steel Joist
Roof Covering
Insulation Fill
Form Deck
Steel Joist
Fire Protection
Fire Protection
Built Up Roof
R e s t r a i n e d Type of M i n i m u m M a x i m u m Primary Support
A s s e m b l y P r o t e c t i o n Type of Metal Deck Joist Size Joist Spacing M e m b e r U.L. Design
R a t i n g S y s t e m I n s u l a t i o n Min. Size See Note #3 & #4 See Note #5 Min. Depth & Wt. N u m b e r
C e m e n t i t i o u s
R i g i d 22 Ga. 14K4 or LH U n r e s t r i c t e d 20G @13.0 plf. P 701
Insulation
22 Ga. 14 K 4 Unrestricted 20G @13.0 plf. P 711
22 Ga 1 6 K 6 Unrestricted – P 8 0 1
1 Hr. Sprayed R i g i d 22 Ga 10 K 1 Unrestricted 20G @13.0 plf. P 815
1 1/2 Hr.
F i b e r
I n s u l a t i o n
22 Ga. 12 K 3 Unrestricted – P816
2 Hr. 22 Ga. 1 2 K 3 Unrestricted 20G @13.0 plf. P 8 1 7
22 Ga. 1 2 K 1 Unrestricted 20G @13.0 plf. P 8 1 8
22 Ga. 1 4 K 4 9 6 " 20G @13.0 plf. P 9 0 2
C e m e n t i t i o u s 24 Ga. 12K5, 14K3 96 " – P 907
a n d
Insulating
Sprayed F i l l 28 Ga. 12K5, 14K3 96 " – P 920
F i b e r
24 Ga. 12 K 5 96 " 20G @13.0 plf. P 921
24 Ga. 1 2 K 3 9 6 " – P 9 2 2
22 Ga 1 2 K 3 9 6 " 20G @13.0 plf. P 9 2 3
N O T E S :
1 . The U N D E RWRITERS LABORAT O RY FIRE
R E S I S TANCE DIRECTORY lists hundreds of
assemblies and their fire ratings. As a convenience a
selected number of assemblies are listed on 3
preceding pages. This listing is intended as a guide
only and the specifying pro f e s s i o n a lmust refer to the
U.L. Directory for complete design information.
2 . The maximum joist spacing shown for Floor-Ceiling
Assemblies may be increased from the spacing listed
in the U.L. Directory to a maximum of 48 inches on
c e n t e r, provided the floor slab meets the structural
requirements and the spacing of hanger wires
supporting the ceiling is not increased.
3 . Some U.L. Design Assemblies stipulate minimum
size materials for Steel Joist and Joist Girder
components, and/or bridging. It is the responsibility of
the specifying pro f e s s i o n a l to show all special
requirements on the Structural Drawings.
4 . Some U.L. Fire Assembly Designs stipulate an
allowable maximum joist design stress level less than
the 30 ksi (207MPa) used in the K-Series Joist
S p e c i f i c a t i o n s .
It is the responsibility of the specifying pro f e s s i o n a lt o
apply the proper stress level reductions (if required)
when selecting Joists and/or Joist Girders.
To adjust the stress level of K-Series Joists or Joist
Girders multiply the design load by the required
factor [30/26 (207/179), 30/24 (207/165), 30/22
(207/1520)], and then using this increased load
select a Joist or Joist Girder from the load and/or
weight tables.
5 . Some U.L. Roof-Ceiling Design assemblies using
direct applied protection limit the spacing of the joists
for certain types and gages of metal decking – refer
to the U.L. Directory for this information.
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