Checking cold-formed steel sections before accepting delivery

It is worth keeping the package identification until the inspection is complete. If they are separated, the numbers should still lead to specific components. This makes it easier to report a missing item or a mistake. The information “two profiles are missing” alone is often insufficient when the order contains dozens of similar items.

Z-sections are recognised by their opposing flanges, C-sections by flanges facing one direction. Sigma has additional web bends, and omega has a hat shape. Once the family is identified, however, the actual dimensions must be compared. The letter alone does not confirm that the cross-section matches.

The measurement should cover the parameters relevant to the order and be taken with the correct tool. The specified tolerances must be taken into account. In the event of discrepancies, the location and method of measurement should be recorded. This allows the problem to be explained objectively rather than relying on an imprecise assessment that the profile “looks different”.

Not only the number of holes should be checked, but also their position and the side of the component. The shape, dimensions and distances from the specified datum are important. It is worth comparing several characteristic positions across different component variants. This makes it possible to detect incorrect orientation or mixed-up drawing versions.

The holes should not be adjusted on site straight away. First, the cause of the discrepancy and the further course of action must be established. Modification can change the properties of the component and make it harder to assess responsibility. Cold-formed profiles should be installed in accordance with the approved solution.

Local crushing, twisting or a bent lip require attention. In a thin-walled cross-section, such areas are structurally significant. They should not be assumed in advance to be a minor aesthetic defect. The assessment depends on the size of the damage and the function of the component.

It is worth documenting the condition before the package is moved any further. The photographs should show both detail and identification of the parts. For long profiles, the method of storage after unloading is also important. Improper support can cause a new problem unrelated to the delivery itself.

Galvanised profiles should be inspected for damage, dirt and moisture. However, this does not allow all coating parameters to be identified. The steel grade and required markings must be derived from the documentation and identification. A silvery colour does not replace this data.

If the package is wet, the procedure must be determined in accordance with the supplier’s recommendations. It should not simply be put aside in sealed packaging for later. Water between adjoining surfaces can hinder drying. The condition of the material should be assessed before it is covered by the structure or installed in a difficult-to-access location.

The acceptance should also cover splice plates, supports and fasteners if they are part of the order. Their absence can halt installation despite delivery of all the long elements. The types and quantities should be compared with the schedule. It is worth keeping the packaging descriptions of the small parts.

The documents should make it possible to link the products to the requirements. It must be checked whether they relate to the correct family and delivery. If data is missing, it must be completed before the parts are used in a structural task. A commercial invoice alone does not contain all the information needed to assess the material.

The scope of measurements should correspond to the acceptance requirements and the nature of the delivery. Checking a few parts is not automatically full confirmation of every item. If a recurring discrepancy is detected, it must be determined how large a portion of the batch the problem covers. This allows the right decision to be made without hastily deeming the entire delivery compliant or defective.

Compliant parts can be passed to orderly storage according to the work plan. Items giving rise to doubt should be clearly marked and organisationally separated. This reduces the risk of their accidental installation. Decisions regarding repair or replacement should have an unambiguous record.

Acceptance carried out in this way need not be complicated. It requires proper documentation and a few well-considered checkpoints. Z-sections, C-sections, sigma and omega remain identifiable until installation. Cold-formed profiles can then be used as intended, and any discrepancies resolved before they hinder the execution of the structure.