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.

Type-A-DeckType “A” (Narrow Rib) Roof Deck

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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

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