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Corrugated CGI

Item Code: 1

Corrugated Iron (CGI) provides you with the style and strength that have been popular in Australia for well over one hundred years. CGI has the advantage of high strength, adaptability and easy handling and installation. It is a practical and versatile solution for roofing and walling applications. Its profile enables it to blend in with contemporary homes, older styled homes or sheds. In addition, CGI is popular in domestic fencing applications.

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Design considerations

The minimum recommended roof pitch is five degrees (1 in 12). CGI roofing is subject to thermal expansion. Darker colours are affected more than light, and spring curved sheeting needs additional consideration. The maximum length before an expansion joint is needed is 24 metres for light colours, and 16 metres for dark colours. For spring curved sheeting this distance is 20 metres for light colours and 16 metres for dark colours.

Profile

 

Material Specifications

Material Properties Finish 0.35BMT 0.42BMT 0.48BMT
Total Coated
Thickness (TCT) mm
Zinc/alum
Colour
0.40
0.43
0.47
0.50
0.53
0.56
Mass
(kg / linear metre)
Zinc/alum
Colour
2.74
2.79
3.26
3.32
3.70
3.76
Mass
(kg / square metre)
Zinc/alum
Colour
3.60
3.67
4.28
4.35
4.86
4.93
Width average (mm) Zinc/alum & Colour 762 762 762
Minimum Roof Pitch Zinc/alum & Colour N/A


Spans (mm)

      Three Fasteners       Five Fasteners      
BMT Application Span Type N1 (W28) N2 (W33) N3 (W41) N4 (W50) N1 (W28) N2 (W33) N3 (W41) N4 (W50)
0.35 mm Walling Single
End
Internal
1300
1750
2300
850
1200
1650
600
750
1100
-
-
-
1650
2050
2450
1450
1750
2200
1250
1450
1950
1000
1000
1600
0.42 mm Roofing Single
End
Internal
800
950
1200
800
950
1200

600
750
1050

-
-
-
800
950
1200
800
950
1200
800
950
1200
800
950
1200
  Walling Single
End
Internal
1650
2100
2700
1350
1550
2200
1050
1100
1700
900
1000
1450
1700
2200
2700
1500
1900
2300
1350
1500
2050
1300
1450
1950
0.48 mm Roofing Single
End
Internal
900
1300
1800
900
1300
1800
600
1000
1550
-
-
-
900
1300
1800
900
1300
1800
900
1300
1800
900
1300
1750
  Walling Single
End
Internal
1900
2250
2800
1450
1850
2200
1100
1500
1950
950
1300
1800
2100
2250
2800
1750
1950
2300
1450
1700
2100
1400
1650
2000
                     

The values are for use with steel supports with a minimum thickness of 0.75mm, G550.

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