What is the biggest problem with metal roofs?

 The biggest problem with metal roofs isn’t that they fail—it’s that small mistakes in design or installation can cause big issues later. More specifically, the most common and serious problem is:

Improper installation (especially fasteners and flashing)

Metal roofing systems expand and contract significantly with temperature changes. If this isn’t handled correctly during installation, it can lead to several problems:

Why this matters

  • Fasteners can loosen over time if they aren’t designed to accommodate movement

  • Improper flashing around chimneys, vents, and valleys can cause leaks

  • Panels can warp or oil-can (visible waviness)

  • Leaks may appear years later, not immediately, making them harder to trace

Other notable drawbacks (but usually manageable)

  • Higher upfront cost than asphalt shingles

  • Noise concerns during heavy rain or hail (often overstated and reduced with proper underlayment)

  • Dent potential from large hail on thinner metal panels

  • Repairs can be more complex, since matching panels years later isn’t always easy

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