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4" Rib

ideal for heavy industrial and lagging applications

To view all painted and unpainted steel and aluminum profile widths, click here.

  • An industry standard–Ideal for heavy industrial and lagging applications
  • Available mill finish, clad or painted in .032", .040" and .050" aluminum
  • Available in 24, 22 & 20 gauge steel, 32" coverage
  • Panels can be curved
  • Minimum slope for steel roofing applications is 21/2:12
  • Standard lengths: 6'-45'
  • 8" Rib available on an inquiry basis

4" Rib Gravity Load Table(Steel)

Ga.

Spans

6'-0"

7'-0"

8'-0"

9'-0"

10'-0"

11'-0"

12'-0"

26

1 & 2

46

34

26

21

NR

NR

NR

26

3

58

43

33

26

NR

NR

NR

24

1 & 2

46

34

26

21

NR

NR

NR

24

3

58

42

32

26

NR

NR

NR

22

1 & 2

62

46

35

28

22

NR

NR

22

3

78

57

44

35

28

25

21

20

1 & 2

77

57

43

34

28

23

NR

20

3

96

71

54

43

35

29

24

18

1 & 2

101

74

57

45

36

30

25

18

3

126

93

71

56

45

38

32

4" Rib Positive Wind Load Table (Alum.)

Thk.

Spans

6'-0"

7'-0"

8'-0"

9'-0"

10'-0"

11'-0"

12'-0"

.032"

1

65

48

37

29

23

NR

NR

.032"

2

56

56

31

25

20

NR

NR

.032"

3

70

70

39

31

25

NR

NR

.040"

1

81

81

45

36

29

24

NR

.040"

2

77

77

43

34

28

23

NR

.040"

3

197

97

54

43

35

29

24

.050"

1

100

100

56

45

36

30

25

.050"

2

103

103

58

46

37

31

26

.050"

3

129

129

73

57

47

38

32

Notes

  • The allowable loads are based on 1986 AISI and 1986 Aluminum Association specifications.
  • The allowable loads are based on stress only.
  • The allowable loads for the steel load table may be increased by 1/3 for wind loading. The allowable loads have been increased for the alumunim load tables by 1/3 for wind loading.
  • The use of steel 4" Rib panels on roof pitches less than 2 1/2":12 (12 degrees) is not recommended.
  • The maximum individual panel length for steel 4" Rib on roofs in 32' due to thermal movement considerations.
  • The use of aluminum 4" Rib panels on roofs is not recommended.