What Is the Biggest Problem With Metal Roofs?
The biggest problem with metal roofs isn’t the metal; it’s improper installation. A quality metal roof can last 40+ years, but poor workmanship (bad flashing, the wrong fasteners, no allowance for thermal movement) causes the leaks and premature failures people blame on “metal roofs.” Get the installation right and most of the horror stories disappear.
Why installation is the real problem
Metal is one of the most durable roofing materials available. When a metal roof fails early, the cause is almost always how it was installed, not what it’s made of. The details that matter most are the ones you can’t see from the ground: how the panels are seamed, where and how they’re fastened, and how the roof is detailed around edges and penetrations.
Where metal roofs actually fail
- Flashing and penetrations: Rushed or incorrect flashing around vents, curbs, and transitions is the #1 source of leaks.
- Fastener choice and spacing: The wrong fastener, or too few, backs out over years of thermal cycling and opens leak paths.
- No allowance for thermal movement: Panels expand and contract with heat; a system that can’t move buckles, oil-cans, or tears at the seams.
- Seam integrity: Improperly seamed or lapped panels let water in during heavy or wind-driven rain.
- Substrate and underlayment: Skipped or incompatible underlayment leads to condensation and premature corrosion.
How to spot a bad metal roof installation
- Visible rust or corrosion at panels or fasteners
- Loose, lifted, or backed-out fasteners, especially at seams and edges
- Water stains or drips inside during heavy rain
- Damaged or missing flashing around penetrations
- Oil-canning (visible waviness) or excessive noise in wind
What a good installation looks like
The failures above are preventable. A durable metal roof uses concealed-fastener standing seam (no exposed screws to fail), panels roll-formed for continuous, lap-free runs, correct thermal-movement detailing, and, on commercial jobs, stamped engineering and full submittals.
What about cost, noise, and denting?
- Cost: Metal costs more up front than shingles, but usually less over the life of the building once you count lifespan, maintenance, and insurance/energy savings.
- Noise: Over proper decking and underlayment, a metal roof is no louder than any other.
- Denting: Quality gauges and profiles are engineered for impact; standing seam is widely used in hail country for exactly this reason.
How to prevent the biggest problem
Improper installation is a workmanship problem, so we removed the handoffs where workmanship breaks down. A-Lert engineers, manufactures, and installs its own systems with one accountable team, no subcontracted fabrication, no finger-pointing. 40+ years, 35M+ sq ft installed, and a 20-year Watertight Warranty behind every roof.
Frequently asked questions
What is the most common problem with metal roofs?
Leaks caused by improper installation, specifically poor flashing, wrong or under-spaced fasteners, and no allowance for thermal movement.
Do metal roofs leak more than shingles?
No, a properly installed metal roof is more watertight than shingles. Leaks come from bad installation, not the material.
How long should a metal roof last?
A quality standing seam roof routinely lasts 40+ years, well beyond the point where shingles would need replacing two or three times.
Are metal roofs noisy in the rain?
No. Over proper decking and underlayment, they’re no louder than other roofs.
If you’re not sure whether your roof was installed correctly, a professional inspection can catch these issues early, before they turn into leaks or structural damage.
Worried your roof wasn’t installed right? Get a free, no-obligation A-Lert inspection and know exactly where your roof stands.