10/03/2026
Here's something that surprises a lot of people: a metal roof is never perfectly still.
Metal expands when it heats up and contracts when it cools. On a long panel in direct sun, that movement adds up. It's the same physics that gives bridges expansion joints, just at roof scale. If a panel is fixed rigidly with no room to move, the stress has to go somewhere, and it can show up as waviness (often called oil-canning), ticking noises, or strain around the fasteners.
That's why many metal roof systems are designed to let panels move slightly, for example with clips that allow the panel to slide as it expands and contracts instead of locking it down at every point.
Have you ever heard a roof "tick" on a hot afternoon? That's thermal movement at work. Tell us your questions in the comments.
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