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Shaftwall Studs
Installation Instructions and Details | Fire Resistance Ratings | Shaftwall Detail Book
Shaftwall
studs are quickly becoming the preferred alternative
to traditional masonry shafts. Shaftwall is less
expensive and lighter than concrete shafts, in
addition the product can easily be installed from
the exterior of the shaft which eliminates the
expense of using scaffolding.
Shaft walls are used to enclose elevator shafts, duct shafts, stairways, and other non-protected floor openings in hotels, office buildings, hospitals and similar non-residential applications. |
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ICBO
ER-4924
Allowable Wall Heights for the I-Stud (Two Hour Wall)(1,2)
| Member |
Type of Fire-Resistive
Assembly |
Deflection |
Design
Load |
5
psf |
7.5 psf |
10 psf |
15 psf |
250IS150-18
250IS150-18
250IS150-18
|
1 hour
1 hour
1 hour |
L/120
L/240
L/360 |
13' 10"
11' 2"
10' 0" |
9' 1"
9' 1"
8' 9" |
7' 10"
7' 10"
7' 10" |
6' 4"
6' 4"
6' 4" |
250IS150-33
250IS150-33
250IS150-33 |
1 hour
1 hour
1 hour |
L/120
L/240
L/360 |
16' 5"
13' 1"
11' 4" |
14' 4"
11' 4"
10' 0" |
11' 3"
10' 4"
9' 1" |
9' 2"
9' 1"
7' 11" |
250IS150-18
250IS150-18
250IS150-18 |
2 hour
2 hour
2 hour |
L/120
L/240
L/360 |
14' 4"
12' 5"
10' 10"
|
11' 8"
10' 10"
9' 6" |
10' 2"
9' 10"
8' 8" |
8' 7"
8' 7"
7' 6" |
400IS150-18
400IS150-18
400IS150-18 |
2 hour
2 hour
2 hour |
L/120
L/240
L/360 |
17' 4"
16' 9"
14' 8" |
14' 5"
14' 5"
12' 6" |
12' 3"
10' 9"
10' 9" |
10' 0"
8' 10"
8' 10" |
250IS150-33
250IS150-33
250IS150-33 |
2 hour
2 hour
2 hour |
L/120
L/240
L/360 |
20' 9"
16' 5"
14' 4" |
16' 11"
14' 4"
12' 3" |
14' 8"
13' 0"
10' 6" |
11' 11"
11' 4"
10' 0" |
400IS150-33
400IS150-33
400IS150-33 |
2 hour
2 hour
2 hour |
L/120
L/240
L/360 |
22' 8"
19' 0"
16' 7" |
18' 6"
16' 8"
14' 6" |
16' 0"
15' 1"
13' 2" |
13' 1"
13' 1"
11' 6" |
600IS150-33
600IS150-33
600IS150-33 |
2 hour
2 hour
2 hour |
L/120
L/240
L/360 |
25' 10"
24' 3"
21' 2" |
21' 1"
21' 1"
18' 6" |
18' 3"
18' 3"
16' 10" |
14' 11"
14' 11"
14' 8" |
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(1)
UBC requires current ICBO-AC86 test information.
(2) Allowable heights are based on transverse load tests complying with
ICBO AC86, with studs spaced a maximum of 24 inches on center.
(3) Limiting height is based on the lesser height of deflection or strength.
(4) Limiting heights with deflection greater than 14 feet are based on
strength results of 14-foot assemblies
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Maximum Horizontal Spans Using I-Stud (1,3) |
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|
Member
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Corridor
ceiling and Stair (2)
|
Horizontal
Membrane and Duct Protection (3,4)
|
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One-Hour-Rated (5)
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Two-Hour-Rated (6)
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Two-Hour-Rating (7)
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250IS150-18
250IS150-33
|
7' 10"
9' 1"
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8' 8"
10' 6"
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7'
6"
10' 0"
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400IS150-18
400IS150-33
|
N/A
N/A
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10'
9"
13' 2"
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10'
2"
11' 6"
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600IS150-33
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N/A
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16'
10"
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14'
8"
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(1)
Systems are designed to support their own dead weight
only, and should not be used where there is access
to an attic or loft space above, or
anywhere else where there is any storage probability of storage above.
(2) Load of 10 lb per square foot and deflection limitation of L/360.
(3) Load of 15 lb per square foot and deflection limitation of L/360.
(4) Ducts must be designed as a separate system and are not part of a
floor/ceiling or roof/ceiling assembly.
(5) See ICBO ER-4924 Figure 4 for detail. Minimum 5/8-inch-thick HARDIROCK
Fire-X gypsum panel
(6) See ICBO ER-4924 Figure 2 for detail. Minimum 1/2 inch-thick HARDIROCK
Max “C” gypsum panel.
(7) See ICBO ER-4924 Figure 7 for detail. |
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