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What is Oil Canning on a Metal Roof?

Metal roofing materials expand and contract due to variations in temperature. As a result, panels will have a level of oil canning to some degree; this will be more visible at certain times of the day, when light and shadow fall off the panel surface.

Oil canning is part of the aesthetic of all metal roofing materials and we reference this in our documentation.

For more information and an example of this, here is some information from VMZinc on Transversal Junctions / Expansion.

The temperature to bear in mind in Sydney, is from 0°C (mid-winter) to +90°C in the sun (height of summer) on the metal's surface. During installation, if we assume an ambient temperature of 25°C, we must also factor in an additional 65°C (expansion) 25°C less (contraction).

For a 10 metre long panel:

A. anticipate an 0.022 mm x 10 x 65 = 14.30 mm increase in length,
B. anticipate 0.022 mm x 10 x 25 = 5.5 mm contraction

VMZinc also has the following information on its website for VMZinc Maintenance, storage recommendations, ventilation, and more. This is also in our documentation.

Please inform us before your project commences if you would like to discuss this further.

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Companies we Represent

VMZinc Ace Gutters Stramit Velux Skydome Solatube Colorbond Bluescope Steel KME Copper Proctor Wrap DEKS Ecolife Solutions Freund Ampelite Buildex Karben-Industries Soudal Stinger


Prestige wishes to advise the following. That all metals will expand and contract at different rates. This expansion can and will move adhesives overtime and can result in a natural wave to a metal materials. This is not a defect but a natural occurrence when working with sheet metal. Prestige will work to the closest of tolerance but reserves the right to a margin of 2.5mm tolerance on products and services provided. Prestige can not warrant nor accept any responsibility on any product once removed from the main premises of prestige for external treatment or other applications out side of the original manufactured state, not limited to the unknown use of products after purchase.