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6″ Rib

Our 6″ Rib profile is usually used as a roofing product however, it has been supplied for siding and other architectural applications.

To view more details about Corrugated Metals, Inc.’s 6″ Rib roofing and siding, please select one of the links below. Or you can contact a CMI representative at 1-800-621-5617.

B-Deck2

B-DECK-Model (1)

Download the 6″ Rib data sheet to see what options are available. Click here to download the PDF.

Load Table

Section Weight Total Cross-Sectional
Area A (in2)		 Allowable Stress
Fa (psi)		 Top Flat in Compression Bottom Flat in Compression
Sheet
lb/ft		 Area
lb/sf		 Moment of Inertia
I (in4/ft)		 Section Modulus
S (in3/ft)		 Allowable Momen
Ma (lb-ft/ft)		 Moment of Inertia
I (in4/ft)		 Section Modulus
S (in3/ft)		 Allowable Moment
Ma (lb-ft/ft)

18 Ga

8.24

2.70

2.42

19760

0.291

0.322

530

0.261

0.395

650

20 Ga

6.60

2.16

1.94

19760

0.233

0.258

425

0.196

0.285

469

22 Ga

5.12

1.68

1.50

19760

0.180

0.200

330

0.141

0.196

322

24 Ga

4.46

1.46

1.31

19760

0.153

0.169

278

0.119

0.160

264

0.05 Alum

2.87

0.94

2.42

5304

0.291

0.322

230

0.291

0.489

231

0.04 Alum

2.29

0.75

1.94

4434

0.233

0.258

168

0.233

0.394

153

0.032 Alum

1.84

0.60

1.55

3821

0.186

0.208

125

0.186

0.319

107

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Table 1: Applied Load (PSF)

An asterisk (*) indicates allowable stress has been reached.

Table 1 Applied Load (PSF)
Allowable Spans 10 20 30 40 50 60
Section Span Limit Span Type Allowable Spans (ft)
18 Ga L/60 1 Span 17′-5″ 13′-8″ * 11′-5″ * 10′-0″ * 9-0″ * 8′-3″ *
2 Span 20′-3″ * 15′-2″ * 12′-7″ * 11′-0″ * 9′-11″ * 9′-1″ *
3 Span 19′-10″ 15′-2″ * 12′-8″ * 11′-1″ * 10′-0″ * 9′-2″ *
L/240 1 Span 11′-0″ 9′-1″ 8′-0″ 7′-4″ 6′-10″ 6′-5″
2 Span 12′-9″ 10′-6″ 9′-4″ 8′-6″ 7′-11″ 7′-6″
3 Span 12′-6″ 10′-3″ 9′-1″ 8′-4″ 7′-9″ 7′-4″
20 Ga L/60 1 Span 16′-1″ 12′-5″ * 10′-3″ * 9′-0″ * 8′-1″ * 7′-5″ *
2 Span 17′-7″ * 13′-0″ * 10′-10″ * 9′-5″ * 8′-6″ * 7′-9″ *
3 Span 18′-2″ * 13′-5″ * 11′-2″ * 9′-9″ * 8′-9″ * 8′-0″ *
L/240 1 Span 10′-2″ 8′-4″ 7′-4″ 6′-8″ 6′-3″ 5′-11″
2 Span 12′-0″ 9′-10″ 8′-8″ 7′-11″ 7′-5″ 7′-0″
3 Span 11′-9″ 9′-7″ 8′-6″ 7′-9″ 7′-3″ 6′-10″
22 Ga L/60 1 Span 14′-7″ 10′-11″ * 9′-0″ * 7′-10″ * 7′-1″ * 6′-6″ *
2 Span 14′-10″ * 10′-11″ * 9′-0″ * 7′-10″ * 7′-1″ * 6′-6″ *
3 Span 15′-4″ * 11′-3″ * 9′-4″ * 8′-2″ * 7′-4″ * 6′-8″ *
L/240 1 Span 9′-2″ 7′-6″ 6′-7″ 6′-0″ 5′-7″ 5′-3″
2 Span 11′-2″ 9′-1″ 8′-0″ 7′-4″ 6′-10″ 6′-5″
3 Span 10′-11″ 8′-11″ 7′-10″ 7′-2″ 6′-8″ 6′-3″
24 Ga L/60 1 Span 13′-7″ * 9-11″ * 8′-2″ * 7′-2″ * 6′-5″ * 5′-10″ *
2 Span 13′-7″ * 9-11″ * 8′-2″ * 7′-2″ * 6′-5″ * 5′-10″ *
3 Span 14′-0″ * 10′-5″ * 8′-6″ * 7′-4″ * 6′-7″ * 6′-1″ *
L/240 1 Span 8′-9″ 7′-1″ 6′-3″ 5′-8″ 5′-4″ 5′-0″
2 Span 10′-8″ 8′-8″ 7′-8″ 6′-11″ 6′-5″ * 5′-10″ *
3 Span 10′-5″ 8′-5″ 7′-5″ 6′-9″ 6′-4″ 5′-11″
0.32 Alum L/60 1 Span 8′-9″ * 6′-3″ * 5′-2″ * 4′-6″ * 4′-0″ * 3′-8″ *
2 Span 8′-9″ * 6′-3″ * 5′-2″ * 4′-6″ * 4′-0″ * 3′-8″ *
3 Span 9′-1″ * 6′-6″ * 5′-4″ * 4′-7″ * 4′-2″ * 3′-9″ *
L/240 1 Span 7′-4″ 5′-11″ 5′-2″ 4′-6″ * 4′-0″ * 3′-8″ *
2 Span 8′-3″ 6′-3″ * 5′-2″ * 4′-6″ * 4′-0″ * 3′-8″ *
3 Span 8′-0″ 6′-5″ 5′-4″ * 4′-7″ * 4′-2″ * 3′-9″ *
0.04 Alum L/60 1 Span 10′-5″ * 7′-6″ * 6′-2″ * 5′-4″ * 4′-9″ * 4′-5″ *
2 Span 10′-5″ * 7′-6″ * 6′-2″ * 5′-4″ * 4′-9″ * 4′-5″ *
3 Span 10′-9″ * 7′-9″ * 6′-4″ * 5′-6″ * 4′-11″ * 4′-6″ *
L/240 1 Span 7′-10″ 6′-4″ 5′-6″ 5′-0″ 4′-8″ 4′-5″ *
2 Span 8′-10″ 7′-1″ 6′-2″ * 5′-4″ * 4′-9″ * 4′-5″ *
3 Span 8′-7″ 6′-11″ 6′-1″ 5′-6″ 4′-11″ * 4′-6″ *
0.05 Alum L/60 1 Span 12′-7″ * 9′-1″ * 7′-6″ * 6′-6″ * 5′-10″ * 5′-4″ *
2 Span 12′-7″ * 9′-1″ * 7′-6″ * 6′-6″ * 5′-10″ * 5′-4″ *
3 Span 13′-0″ * 9′-5″ * 7′-9″ * 6′-9″ * 6′-0″ * 5′-6″ *
L/240 1 Span 8′-5″ 6′-9″ 5′-11″ 5′-5″ 5′-1″ 4′-9″
2 Span 9′-5″ 7′-7″ 6′-8″ 6′-1″ 5′-8″ 5′-4″ *
3 Span 9′-3″ 7′-5″ 6′-6″ 5′-11″ 5′-6″ 5′-2″

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Table 2: Trial Span (ft)

An asterisk (*) indicates allowable stress has been reached.

A strikethrough (100) indicates less than 10 small PSF ASCE minimum.

Table 2

Trial Span (ft)

Allowable Loads

3

4

5

6

7

8

9

10

11

12

Section

Span Limit

Span Type

Allowable Loads (PSF)
18 Ga L/60 1 Span

368 *

262 *

166 *

115 *

83 *

63 *

49 *

39 *

32 *

26 *
2 Span

575 *

322 *

205 *

141 *

103 *

78 *

61 *

49 *

40 *

33 *
3 Span

579 *

325 *

207 *

142 *

104 *

79 *

62 *

49 *

40 *

33 *
L/240 1 Span

468 *

260

131

75

46

30

20

14

9

7
2 Span

575 *

322 *

205 *

120

74

49

33

23

17

12
3 Span

579 *

325 *

194

111

69

45

31

21

15

11
20 Ga L/60 1 Span

375 *

210 *

133 *

92 *

67 *

51 *

39 *

31 *

25 *

21 *
2 Span

415 *

232 *

148 *

102 *

74 *

56 *

44 *

35 *

28 *

23 *
3 Span

443 *

248 *

158 *

109 *

79 *

60 *

47 *

37 *

30 *

25 *
L/240 1 Span

375 *

195

99

56

34

22

15

10

7

5
2 Span

415 *

232 *

148 *

96

59

39

26

19

13

10
3 Span

443 *

248 *

155

89

55

36

24

17

12

9
22 Ga L/60 1 Span

284 *

159 *

101 *

69 *

50 *

38 *

30 *

24 *

19 *

16 *
2 Span

284 *

159 *

101 *

69 *

50 *

38 *

30 *

24 *

19 *

16 *
3 Span

304 *

170 *

108 *

74 *

54 *

41 *

32 *

25 *

21 *

17 *
L/240 1 Span

284 *

140

71

40

24

16

10

7

5

3
2 Span

284 *

159 *

101 *

69 *

46

30

20

14

10

7
3 Span

304 *

170 *

108 *

68

42

28

19

13

9

7
24 Ga L/60 1 Span

232 *

130 *

82 *

57 *

41 *

31 *

24 *

19 *

15 *

13 *
2 Span

232 *

130 *

82 *

57 *

41 *

31 *

24 *

19 *

15 *

13 *
3 Span

248 *

139 *

88 *

61 *

44 *

33 *

26 *

21 *

17 *

14 *
L/240 1 Span

232 *

117

59

33

20

13

9

6

4

2
2 Span

232 *

130 *

82 *

57 *

39

25

17

12

9

6
3 Span

248 *

139 *

88 *

58

36

23

16

11

8

6
0.32 Alum L/60 1 Span

89 *

50 *

31 *

21 *

15 *

12 *

9 *

7 *

6 *

5 *
2 Span

89 *

50 *

31 *

21 *

15 *

12 *

9 *

7 *

6 *

5 *
3 Span

95 *

53 *

34 *

23 *

17 *

12 *

10 *

8 *

6 *

5 *
L/240 1 Span

89 *

50 *

31 *

18

11

7

5

3

2

1
2 Span

89 *

50 *

31 *

21 *

15 *

10

7

5

3

2
3 Span

95 *

53 *

34 *

23 *

15

10

6

4

3

2
0.04 Alum L/60 1 Span

128 *

72 *

45 *

31 *

23 *

17 *

13 *

10 *

8 *

7 *
2 Span

128 *

72 *

45 *

31 *

23 *

17 *

13 *

10 *

8 *

7 *
3 Span

137 *

76 *

48 *

33 *

24 *

18 *

14 *

11 *

9 *

7 *
L/240 1 Span

128 *

72 *

40

23

14

9

6

4

3

2
2 Span

128 *

72 *

45 *

31 *

20

13

9

6

4

2
3 Span

137 *

76 *

48 *

31

19

12

8

6

4

3
0.05 Alum L/60 1 Span

191 *

107 *

68 *

47 *

34 *

26 *

20 *

16 *

13 *

11 *
2 Span

191 *

107 *

68 *

47 *

34 *

26 *

20 *

16 *

13 *

11 *
3 Span

204 *

114 *

72 *

50 *

36 *

27 *

21 *

17 *

14 *

11 *
L/240 1 Span

191 *

101

51

29

18

11

8

5

3

2
2 Span

191 *

107 *

68 *

41

26

17

11

8

6

4
3 Span

204 *

114 *

67

38

24

15

10

7

5

4

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Notes

  1. An asterisk (*) indicates allowable stress has been reached.
  2. A strikethrough (100) indicates less than 10 small PSF ASCE minimum.
  3. For structural roofing & siding made of formed metal sheets, a total load deflection shall not exceed L/60.
  4. Refer to Table 1604.3 limits and footnotes of the International Building Code (IBC) for additional guidance.
  5. Allowable spans and loads DO include self-weight of panel.
  6. All values are for one foot of panel width unless noted otherwise.

Notes – Steel

  1. Yield stress = Fy = 33,000 psi.
  2. Loads and spans for carbon steel are based on AISI Standard for Design of Cold-Formed Steel Structure Members (2007 Edition).

Notes – Aluminum

  1. Yield stress = Fcy = 13,000 PSI.
  2. Loads and spans for aluminum are based on Aluminum Design Manual (January 2005).

CMI is a leading manufacturer of a wide range of roofing, siding, and architectural panels. Our advanced technology roll forming equipment can produce panels with up to 48″ coverage, in all types of metals, standard and special finishes. From large industrial and institutional facilities to commercial projects, our customers count on CMI to deliver on time, on-spec.

Call us today at 1-800-621-5617, fill out our contact form, or email us at info@corrugated-metals.com.