Test Requirements

Uniformly distributed Load (UDL)

1. Serviceability tests:
   1. Deflection under load.
   2. Permanent deformation or cracking around the fastener head, or de-indexing or de-clipping of clip fastened profiles. Serviceability failure of clip-fastened products may occur when a clip disengages from the central rib, but the weathertightness of the lap is not affected, and the roof can continue to resist increased loads.
2. Strength tests.
   Strength tests are defined as: sheet unable to resist further loads, i.e. pull-off from clips, buckling, tearing or pull-through of fasteners.

Point Load

1. Resistance to point load on the pan, or to two ribs of narrow profiles, at the weakest point.
2. Residual deflection after imposition of serviceability load and application of strength load
3. Resistance to point load on a single rib at the weakest point.
4. Residual deflection after imposition of serviceability load and application of strength load

Load is applied in a downward direction through a rubber-faced pad. The weakest point is generally mid-span at the rib/pan adjacent to the underlap.