INFORMATION TO BE NOTED
Uniform visual appearance (color, spangle, shadow spots, and striping) of unfinished Galvalume(r), Acrylic Galvalume(r), Galvanized, Acrylic Galvanized, Aluminum, and Paint Grip panels cannot be guaranteed. If uniform appearance is desired, then prepainted Galvalume(r) or Galvanized should be ordered. Non-uniform surface appearance (color, spangle, shadow spots, and striping) may occur over time, it does not represent a deficiency in the material, nor does it affect any warranties which may be in place, and it is not a reason for rejection.
Oil canning can be defined as the actual waviness in the flat areas of roofing and siding panels. Generally the period and amplitude of the wave depend on the width of the flat. Oil Canning is an inherent condition with light gauge cold formed metal products, and can result from residual stresses induced or redistributed during coil production, slitting, perforating, forming or fabrication of steel products. Improper deck handling, installation or attachment to misaligned steel supports can also cause oil canning.
In general, oil canning is an aesthetic condition with no effect on the structural integrity of the deck. Since many uncontrollable factors can lead to oil canning, the manufacturer assumes no responsibility for the cost of actions taken in response to an oil canning condition. Oil canning shall not be a cause for rejection of material.
Download Oil Canning Technical Bulletin (.pdf)
Download Oil Canning Technical Disclaimer (.doc)