How to assess a 100 mm second-quality wall panel that looks as good as new

Ask how the pack was stored and whether individual panels can be inspected. Protective film and wrapping can conceal defects. Agree with depot staff how the panels will be made accessible and secured again. Never pull a panel from the pack yourself.

View the facing from several angles. Light falling along the sheet reveals dents and waviness, while a close inspection helps you see coating damage. Inspect the inner face too. Once installed, it may be exposed to washing or moisture and must remain serviceable even if hidden from the outside.

Distinguish a shallow scratch from damage deep enough to expose the steel. Agree on a repair method suitable for the finish. A local touch-up may remain visible, particularly on a smooth façade. If appearance matters, inspect a representative touch-up before buying the full batch.

Even on a panel with a flawless face, a distorted joint can stop adjacent panels from engaging. Inspect the full length of each edge, the condition of the core and its bond to the metal facings. Delamination, moisture marks and crushed areas require technical assessment. Covering a defect with flashing may hide it without restoring the joint or the bond.

For repairs to an existing wall, compare the joint geometry and effective cover width. Equal thickness does not guarantee a fit. A safely arranged trial fit can reveal a mismatch, but you still need product data. Thermal performance, load capacity and fire classification apply to the specified assembly and cannot simply be taken from another 100 mm panel.

A slight shade difference may be acceptable in a plant room. The same variation may rule out use on a front elevation or in a room with a specified finish. Draw the panel layout, showing lengths and the position of accepted blemishes. Switching a panel to a less visible position cannot resolve a structural defect or a leaking joint.

List the pieces to be cut and their usable lengths after cutting. With short pieces, it can be difficult to retain adequate bearing or finish the wall without an extra junction detail. For a heated room, verify the performance of the complete wall assembly. Specifying a 100 mm core answers only part of the design question.

Suppose 60 m² costs €1,527.57, or approximately €25.46/m². If you reject 6 m², the material works out at €28.29 per usable square metre. Allowing €124.98 for agreed repairs brings that figure to €30.60/m². All amounts exclude VAT. The unit rates are rounded and illustrate a calculation for a hypothetical batch.

Include transport, flashings and the labour needed to adapt the pieces. Compare the result with panels supplied in the right lengths and without the same restrictions. Outlet stock may still cost less, but base the comparison on the usable quantity. A discount on the whole pack tells you little about the finished wall if some pieces have to be discarded.

Before installation, record the condition of the accepted defects and how each will be repaired. Make sure the record covers the batch actually delivered. Retain labels and documents so you can identify a matching replacement after an impact from a forklift or a later change in room layout. A photograph of the outer face alone rarely identifies the joint or finish.

After installation, inspect repaired areas, edges and the wall base as required for the product. Where impact damage recurs, plan protection against its cause. Second-quality panels are worth considering when their documented limitations are compatible with the building’s use.