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Oil canning

Which of the following statements are most true about oil canning? Choose 3
A. it reflects a structural problem in metal surfacing, B. it is an aesthetic problem and should be disregarded, C. reduce panel widths to avoid this, D. increase material gage to avoid this, E. use lighter, neutral colors to minimize its perception, F. closer spacing of panels will prevent excessive movement

C, D, E are correct.
Oil canning is the perception of waviness (uneven flatness) in metal sheet surfaces such as roofing panels and wall panels. While it is aesthetic, not a defect, its appearance can easily be managed. Panel spacing must allow for movement to prevent apparent buckling.
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