Type “A” (Narrow Rib)Corrugated Metal Roof Deck
Type A (Narrow Rib) Roof Deck Description:
Type A (Narrow Rib) deck is designed to allow the use of the most economical insulation materials. it provides a maximum top surface contact area which is suitable for thinner rigid boards and the nest-able quality eliminates the need for die-set ends to reduce installation costs.
Certified by Steel Deck Institute
Classified by Underwriters Laboratories Inc.
Section Properties (Per Ft. of Width)
| Deck Gage | Design Thickness In. | Weight Lbs. Per Sq. Ft. | “I” in. | “Sp” in. | “Sn” in. | |
| Ptd. | Galv. | |||||
|
22 |
0.0295 |
1.75 |
1.97 |
0.130 |
0.113 |
0.113 |
|
20 |
0.0358 |
2.10 |
2.32 |
0.158 |
0.137 |
0.137 |
|
18 |
0.0474 |
2.80 |
3.02 |
0.210 |
0.181 |
0.181 |
Uniform Total (Dead & Live) Load – Lbs. Per Sq. Ft.
| Span Condition | Gage | Span, Ft.-in. | ||||||||||
| 4-0 | 4-6 | 5-0 | 5-6 | 6-0 | 6-6 | 7-0 | 7-6 | 8-0 | 8-6 | 9-0 | ||
|
Simple |
22 |
93 |
73 |
59 |
49 |
41 |
35 |
30 |
|
|
|
|
|
20 |
113 |
89 |
72 |
59 |
50 |
42 |
36 |
32 |
|
|
|
|
|
18 |
149 |
118 |
95 |
79 |
66 |
56 |
48 |
42 |
36 |
32 |
|
|
|
Two |
22 |
93 |
73 |
59 |
49 |
41 |
35 |
30 |
|
|
|
|
|
20 |
113 |
89 |
72 |
59 |
50 |
42 |
36 |
32 |
|
|
|
|
|
18 |
149 |
118 |
95 |
79 |
66 |
56 |
48 |
42 |
37 |
33 |
|
|
|
Three or More |
22 |
116 |
92 |
74 |
61 |
51 |
44 |
38 |
33 |
|
|
|
|
20 |
141 |
111 |
90 |
74 |
62 |
53 |
46 |
40 |
35 |
31 |
|
|
|
18 |
187 |
147 |
119 |
98 |
83 |
70 |
61 |
53 |
46 |
41 |
36 |
|