Oil canning metal roof. What causes oil canning. The degree of the waviness tends to change under different lighting conditions. Oil canning can originate with stress in the metal coil from which the metal panel is milled.
Oil canning is defined as the perceived waviness of a metal panel and is an inherent characteristic of light gauge cold rolled flat metal products. In the world of metal roofing oil canning is one of those phrases. Oil canning happens to some degree with every type of metal roof and while it doesnt affect the materials performance it can detract from the good looks of your newly installed roof.
Oil canning is the waviness of a metal panel and is an inherent characteristic of light gauge cold rolled flat metal products. This problem affects all metal panels including copper zinc steel and aluminum. One issue that occurs with metal roofs is oil canning or stress wrinkling that wavy appearance you see in the roof panel on the left side of the above photo.
Oil canning may show up as a symptom to a bigger problem with the substructure of the roof. It is a makes metal panels look wavy or somewhat distorted especially in the broad flat areas of a metal roof or wall system. Oil canning in metal roofing is visible waviness bulking or rippling of the metal that affects flat surfaces of the roofs between the standing seams.