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Type BI Inverted Form Deck

Type BI Inverted Form Deck

18, 20, 22 Gauge

Type"B" inverted form deck is used when the spans and loads exceed the capability of standard and heavy-duty form decks.  This deck is available in stainless steel and galvanized steel.

Section Properties (Fy=33 ksi)
Gage Design Thickness Weight (psf)Glv Ip(In4) In(In4) Sp(In3) Sn(In3)
22 .0295 1.61 0.1891 0.1557 0.196 0.1876
20 .0358 2.04 0.2305 0.1999 0.2458 0.2315
18 .0474 2.70 0.3061 0.2854 0.3263 0.3132
16 .0598 3.20 0.3869 0.3801 0.4104 0.401
Section properties calculated in accordance with AISI specifications
Maximum Construction Clear Spans
Slab Depth Gage Weight PSF NW Concrete 145 PCF Weight PSF LW Concrete 110 PCF
1 Span 2 Span 3 Span 1 Span 2 Span 3 Span

3.5”
22 37 4-7 6-2 6-2 29 5-0 6-7 6-8
20 38 5-5 7-3 7-4 29 5-10 7-10 7-11
18 38 6-6 8-6 8-10 30 7-1 9-2 9-7

4.0”
22 43 4-5 5-10 5-11 33 4-9 6-4 6-5
20 44 5-1 6-10 6-11 34 5-7 7-5 7-6
18 44 6-2 8-1 8-5 34 6-9 8-10 9-1

4.5”
22 49 4-2 5-8 5-8 38 4-7 6-1 6-2
20 50 4-11 6-7 6-8 38 5-4 7-2 7-3
18 50 5-11 7-9 8-0 39 6-5 8-5 8-9

5.0”
22 55 4-0 5-5 5-6 42 4-5 5-11 6-0
20 55 4-8 6-4 6-5 43 5-2 6-11 7-0
18 56 5-7 7-5 7-8 43 6-3 8-2 8-5

5.5”
22 61 3-11 5-3 5-4 47 4-3 5-8 5-9
20 62 4-6 6-1 6-2 47 5-0 6-8 6-9
18 63 5-5 7-1 7-4 48 6-0 7-10 8-2

6.0”
22 68 3-9 5-1 5-1 52 4-2 5-6 5-7
20 68 4-4 5-11 6-0 52 4-10 6-6 6-7
18 69 5-2 6-10 7-1 53 5-9 7-7 7-10

6.5”
22 74 3-8 4-11 5-0 56 4-0 5-5 5-5
20 74 4-3 5-9 5-9 57 4-8 6-3 6-4
18 75 5-0 6-8 6-10 57 5-7 7-5 7-8
Span Condition Gage Design Criteria Uniform Total Load in Pounds Per Square Foot (Dead and Live)
5’-0” 5’-6” 6’-0” 6’-6” 7’-0” 7’-6” 8’-0” 8’-6” 9’-0”

One

22
36000 101 83 70 60 51 45 39 35
L/240 98 74 57 44 36 29 24 20
L/180 * * * 59 48 39 32 26

20
36000 128 105 89 75 65 57 50 44 39
L/240 120 90 69 54 43 35 29 24 20
L/180 * * 93 73 58 47 39 32 27

18
36000 171 142 119 101 87 76 67 59 53
L/240 160 120 92 72 58 47 39 32 27
L/180 * * 123 97 77 63 52 43 36

Two

22
36000 98 81 68 58 50 43 38 34 30
L/240 * * * * 86 70 58 48 40
L/180 * * * * * * 77 64 54

20
36000 122 101 84 72 62 54 47 42 37
L/240 * * * * * * 70 59 49
L/180 * * * * * * * * *

18
36000 166 137 115 98 84 74 65 57 51
L/240 * * * * * * * * *
L/180 * * * * * * * * *

Three or More

22
36000 123 101 85 72 62 54 48 42 38
L/240 * * * 85 68 55 45 38 32
L/180 * * * * * 73 60 50 42

20
36000 152 126 106 90 78 67 59 52 47
L/240 * * * 103 83 67 55 46 39
L/180 * * * * * 90 74 61 52

18
36000 208 172 144 123 106 92 81 72 64
L/240 * * * * 110 89 74 61 51
L/180 * * * * * * * * 69

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