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Underwriters Laboratories Designs


D-781 Protected Floor Assembly
CELLULAR AND FLUTED UNITS
Restrained Assembly Rating, hr
Unrestrained Assembly Rating, hr
Unrestrained Beam Rating, hr
On W8X24 Beam
Flat PlateFlutes
Crests and Sides
2
1
1
9/16
1/2
1/2
1/2
2
1-1/2
1-1/2
7/8
1/2
1/2
1/2
2
2
2
1-1/8
1/2
1/2
1/2
2
2
3
1-11/16
1/2
1/2
1/2
FLUTED UNITS ONLY
Concrete Type
2
1
1
9/16
LW/NW
1/2
1/2
2
2
2
1-1/8
LW/NW
1/2
1/2
3
1-1/2
1-1/2
13/16
LW/NW
1-1/16
1-1/16
3
3
3
1-9/16
LW/NW
1-1/16
1-1/16
4
2
2
1-1/8
LW
1-3/8
1-13/8
4
4
4
1-15/16
LW
3/8
1-3/8


D-922 Unprotected Floor Assembly
Restrained
Assembly Rating
Unrestrained
Assembly Rating
Unrestrained
Beam Rating
Material Thickness
Beam
1, 1-1/2, 2
1
9/16
1, 1-1/2, 2, 3
1-1/2
7/8
1
1
9/16
1-1/2
1-1/2
7/8
2
2
1-1/8
3
3
1-11/16


N-755 Floor Beam
Rating
Restrained
Beam
Unrestrained
Beam
Unrestrained
Beam - Fluted Deck
1
9/16
9/16
9/16
1-1/2
5/8
7/8
13/16
2
13/16
1-1/8
1-1/8
3
1-1/4
1-11/16
1-9/16
4
1-11/16
2-3/16
1-15/16


P-720 Protected Roof Assembly (Polyisocyanurate or Mineral & Fiber Board Insulation)
Restrained
Assembly Rating
Unrestrained
Assembly Rating
Unrestrained
Beam Rating
With Wallboard
Deck
Beam
Joist
1
1
1
1-1/4
1-1/4
1-5/8
1-1/2
1-1/2
1
1-1/2
1-1/4
1-5/8
2
2
2
1-11/16
1-1/2
2-1/2
Without Wallboard
Deck
Beam
Joist
1
1
1
1-11/16
1-1/4
1-13/16
1-1/2
1-1/2
1
1-15/16
1-1/4
2-5/16
2
2
2
2-1/4
1-1/2
2-1/2


P-721 Protected Roof Assembly (Perlite Asphalt Insulation)
Restrained
Assembly
Unrestrained
Assembly
Unrestrained
Beam
Material Thickness
Deck
Beam
1
1
1
1
1-5/16


S-723 Roof Beam
(Un) Restrained
Beam Rating
Min.
Thickness
1
1
1-1/2
1-5/16
2
1-5/8


X-753 Column
Rating
Min. Thickness
3/4
5/8
1
13/16
1-1/2
1-1/16
2
1-3/8
3
1-5/8
4
2


X-754 Column
Rating
Min. Thickness
3/4
5/8
1
13/16
1-1/2
1-1/16
2
1-3/8
3
1-5/8
4
2


X-755 Column
Rating
Min. Thickness
3/4
5/8
1
13/16
1-1/2
1-1/16
2
1-3/8
3
1-5/8
4
2


XR-704 UL 1709
Rating
Min. Thickness
1
1
1-1/2
1-3/16
2
1-7/16
2-1/2
1-5/8
3
1-13/16
4
2-5/16+
+ Min. thickness 2-1/4 for boxed application.


     
Y-714 Columns
Minimum Thickness
Column Size
Min. W/D
Ratio
1h
1-1/2h
2h
3h
4h
W 6x9
0.331
1
1-3/8
1-11/16
2-3/8
3
W 6x12
0.435
15/16
1-1/4
1-9/16
2-3/16
2-13/16
W 6x16
0.568
7/8
1-3/16
1-7/16
2-1/16
2-11/16
W 8x28
0.672
13/16
1-1/16
1-5/16
1-13/16
2-5/16
W 10x49
0.827
3/4
1
1-1/4
1-3/4
2-1/4
W 12x106
1.443
1/2
3/4
1
1-7/16
1-7/8
W 14x233
2.492
1/2
1/2
11/16
1
1-3/8
W 14x730
6.62
1/2
1/2
1/2
1/2
5/8


 
Y-714 Pipe and Tube Steel
Minimum Thickness
Column Size (In.)
Min. A/P
Ratio
1h
1-1/2h
2h
3h
4h
4x4x3/16
0.18
15/16
1-1/4
1-9/16
2-1/8
2-11/16
4 dia. x 0.237
0.23
7/8
1-3/16
1-1/2
2-1/8
2-13/16
4x4x5/16
0.29
11/16
1
1-5/16
1-15/16
2-1/2
4x4x3/8
0.34
5/8
15/16
1-3/16
1-3/4
2-3/8
6 dia. x 0.432
0.40
9/16
13/16
1-1/8
1-5/8
2-3/16
4x4x1/2
0.44
1/2
3/4
1-1/16
1-9/16
2-1/8
8x8x5/8
0.58
1/2
5/8
13/16
1-1/4
1-11/16
20x20x3/4
0.72
1/2
1/2
11/16
1
1-3/8
20x20x1
0.95
1/2
1/2
9/16
7/8
1-1/8
20x20x1-1/2
1.39
1/2
1/2
1/2
5/8
7/8
20x20x1-3/4
1.60
1/2
1/2
1/2
9/16
3/4
32x32x1-1/4
1.20
1/2
1/2
1/2
11/16
15/16
36x24x1/2
0.49
1/2
11/16
7/8
1-5/16
1-11/16


Note: For additional information please refer to the Underwriters Laboratories Fire Resistance Directory or consult us.


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(Draft - Under Construction)