Which installation method could lead to oil canning?

The correct answer highlights that normal installation methods can lead to a phenomenon known as "oil canning." Oil canning is a term used to describe the waviness or distortion that can occur in metal siding or roofing materials. This distortion is often a result of stress placed on the metal during the installation process or environmental factors such as temperature changes.

While the phrase "normal installation methods" implies that there is an expectation of proper procedure, it can also refer to scenarios where the standards of installation being applied are insufficient for specific material types or environmental conditions. Improper fastener usage and excessive overlapping of panels typically cause more significant structural issues and are not classified as "normal." Similarly, using low-quality materials is an entirely different concern that could contribute to issues but does not fall under the definition of standard installation techniques.

The complexity of metal and material behavior under various installations indicates that even seemingly acceptable methods can inadvertently lead to oil canning if they are not exemplary in their execution for the material at hand. Adjustments to installation practices may be necessary to ensure that unwanted distortions do not arise, emphasizing the importance of understanding both the material properties and the precise practices recommended for installation.