A metal roof lasts a long time, but nothing lasts forever. Whether you’re replacing old shingles with metal or swapping a tired metal roof for a new one, here’s how to know it’s time, what it costs, and how the job goes.

Signs it’s time to replace

• Leaks that keep coming back after repairs.
• Widespread rust, or a chalky, faded finish on an old panel.
• Loose or backed-out fasteners across the whole roof.
• An asphalt roof that’s near the end of its life and due for something more permanent.

Replace or go over the old roof?

If you’re covering old shingles, you can often install metal right over one layer, which saves on tear-off. See metal roof over shingles. If the deck is soft or there are already two layers, tear it off first.

What it costs

Replacement cost depends on the panel system, the gauge, and how complex your roof is. Standing seam costs more than exposed fastener but lasts longer. For real ranges, see our metal roofing cost guide.

Choosing the new panel

This is your chance to upgrade. Pick a standing seam system for a clean, long-term roof, or an exposed fastener panel to keep the budget down. Our panel guide and standing seam page lay out the options. A metal roof also reflects heat, which can trim cooling costs (DOE cool roofs).

FAQ

How long does a metal roof last before replacement?

Often 40 to 70 years, which is two to three times longer than asphalt.

Can I replace just part of a metal roof?

Sometimes. Matching an old, faded color is hard, so full sections usually look best.

Bottom line: replace when repairs stop working, and use it as a chance to upgrade the panel. Get a quote on panels for your reroof.