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Colorcoat® Column: Gauges

29 June 2009 No Comment

What impact does the ordered gauge have on the structural performance of profiled pre-finished steel cladding?

The structural performance of a pre-finished steel profiled sheet is dependant upon 3 factors:
1.shape/geometry of the profile
2.gauge of the steel substrate
3.mechanical properties of the steel grade used.

Gauges and tolerances

EN10143:2006 specifies the maximum and minimum actual gauge, which is permissible for a nominal ordered gauge.
For example a 1250 mm wide 0.7 mm coil must be supplied within the gauge range 0.64 mm to 0.76 mm.
It should be noted that the tolerances quoted in the current 2006 version of this document are slightly tighter than those quoted in the previous document, so the specifier should ensure that material is supplied to the correct standard.
Ordering material with a lighter nominal gauge than 0.7 mm, but within the apparent tolerance range, may result in material actually produced being less than 0.64mm. The structural performance of the profile will consequently be reduced.
All Colorcoat® pre-finished steel meets the requirements of EN10143:2006.

Mechanical properties of the steel substrate

All Colorcoat® pre-finished steel for wall and roof cladding is supplied with a specified minimum yield strength. This figure is used to calculate the structural performance of the profiled pre-finished steel sheet. In practice, the actual yield point will generally be significantly greater than the minimum value, resulting in a profiled pre-finished steel sheet with a greater resistance to stress failure.

 “How do I ensure the correct structural performance of the pre-finished steel sheeting?”

Load span tablesLoad span tables are used to calculate the maximum permissible purlin spacing at which the profiled sheeting will meet the structural requirements for the building location and application.
All Corus Colors supply chain partners have load span tables that have been calculated according to EC3 and have been independently assessed and approved by the Steel Construction Institute. (SCI Assessed)
The load/spans quoted in these tables are specific to the exact profiles and material specifications supplied by these profilers and cannot be applied to different profiles or material grades/gauges.


CE marking

CE-marking is a European product information label that indicates that the properties of the product have been tested according to European standards. The European Commission has determined which properties for which building products in the EU are relevant and should be tested and what external verification is appropriate.  The values of the tested properties have to be stated/printed by the producer on the product, the packaging or the accompanying coupon. Country supervisors inspect randomly if CE-marks on products are complete and correct.
All Corus Colors supply chain partners are able to supply CE marked pre-finished steel profiled sheeting, which meets the requirements of EN 14782.

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