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7
SECTION PROPERTIES
ACOUSTICAL INFORMATION
Deck
Absorption Coefficient
Noise Reduction
Type
125
250
500
1000
2000
4000
Coefficient
1
1.5BA, 1.5BIA
.11
.18
.66
1.02
0.61
0.33
0.60
1
Source: Riverbank Acoustical Laboratories.
Test was conducted with 1.50 pcf fiberglass batts and
2 inch polyisocyanurate foam insulation for the SDI.
VERTICAL LOADS FOR TYPE 1.5B
1.5 B, BI, BA, BIA, BSV
Type B (wide rib) deck provides excellent structural load carrying
capacity per pound of steel utilized, and its nestable design eliminates
the need for die-set ends.
1" or more rigid insulation is required for Type B deck.
Acoustical deck (Type BA, BIA) is particularly suitable in structures
such as auditoriums, schools, and theatres where sound control is
desirable. Acoustic perforations are located in the vertical webs where
the load carrying properties are negligibly affected (less than 5%).
Inert, non-organic glass fiber sound absorbing batts are placed in the
rib openings to absorb up to 60% of the sound striking the deck.
Batts are field installed and may require separation.
R
O
O
F
Maximum Sheet Length 42'-0
Extra charge for lengths under 6'-0
ICC ER-3415
FM Global Approved
2
Interlocking side lap
is not drawn to show
actual detail.
Notes: 1. Minimum exterior bearing length required is 1.50 inches. Minimum interior bearing length required is 3.00 inches.
If these minimum lengths are not provided, web crippling must be checked.
2. FM Global approved numbers and spans available on page 21.