Metal Roofing Myths, Debunked
Quick answer
The most common metal roofing myths are false: they are not noisy (about as quiet as asphalt over a proper deck), do not attract lightning (material does not affect strikes), do not make your house hotter (cool-roof finishes reflect heat), do not easily dent (Class 4 impact-rated), and aluminum does not rust. Here is the reality behind each.
Why metal roofing has a myth problem
Metal roofing carries a set of persistent myths, most rooted in outdated impressions — a rattly barn roof, a hot metal shed, an old wives' tale about lightning. Modern residential metal roofing is nothing like those images, and the facts are well documented by testing and building science. Here are the five most common myths and the reality behind each, with links to the full explanations.
The five biggest myths
Myth 1 — "They're noisy." Over a solid deck, underlayment, attic, and insulation, a metal roof in the rain is about as quiet as asphalt, around 50 decibels indoors; the noisy reputation comes from open barns with none of those layers. Myth 2 — "They attract lightning." Lightning strikes the tallest object regardless of material, and if struck, a non-combustible metal roof is actually safer. Myth 3 — "They make your house hotter." A cool-roof-rated metal roof reflects solar heat and doesn't store it, so it keeps homes cooler than dark asphalt. Myth 4 — "They dent easily." Interlock is UL 2218 Class 4 rated — the highest impact class — and measures cracking, not cosmetic dents. Myth 5 — "They rust." Aluminum contains no iron and cannot rust.
What is actually true
Strip away the myths and the real story is compelling: a metal roof is a lifetime investment that resists fire, hail, and wind, reflects heat to cut cooling costs, installs over most existing roofs, and — in aluminum — never rusts, all backed by independent certifications. The honest trade-offs are a higher upfront cost and the need for a skilled installer. Knowing which concerns are real and which are myths is what lets you make the decision with confidence.
Frequently Asked Questions
Are metal roofs noisy in the rain?
No. Over a solid deck, underlayment, attic, and insulation, indoor rain noise is comparable to asphalt — around 50 decibels. The "loud roof" myth comes from open barns with none of those sound-absorbing layers.
Do metal roofs attract lightning?
No. Lightning strikes the tallest object in an area regardless of roofing material. If a strike does occur, a non-combustible metal roof is safer because it won't ignite and disperses the energy.
Do metal roofs make a house hotter?
No — the opposite. A cool-roof-rated metal roof reflects solar heat and doesn't store it like dark asphalt, so it typically keeps a home cooler and lowers cooling costs.
Do metal roofs dent and rust?
Interlock is UL 2218 Class 4 rated against cracking (the damage that matters, not cosmetic dents), and aluminum contains no iron, so it cannot rust — two myths the certifications directly disprove.
Sources
- Metal Roofing Alliance — Myths & facts — Industry myth-busting
- Interlock — Testing Reports — Performance data
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Last reviewed 2026-07-11 · Reviewed by Scott Plumptree, Director of Marketing