Metal Roof Scratches, Dents & Touch-Ups: What to Know
Quick answer
Minor surface scratches and small dents are cosmetic and do not affect a metal roof's performance or watertightness — and they are generally excluded from warranties as normal wear, industry-wide. Interlock's PVDF finish is durable, and for the rare visible scratch, color-matched touch-up paint is available. Functional damage is what the warranty and certifications cover.
Cosmetic vs. functional — the key distinction
It helps to separate two very different things. Functional damage — cracking, puncturing, or rupture that lets water in — is what ends a roof's life, and it's what Interlock's certifications (UL 2218 Class 4) and warranty address. Cosmetic marks — a minor scratch, a small dent, or slight oil canning on a flat area — are surface-appearance issues that do not affect whether the roof performs. A scratched or lightly dented panel is still fully watertight and structurally sound.
What warranties cover (and don't)
Across the roofing industry, warranties cover functional defects and performance, not cosmetics — and Interlock's Guardian warranty is explicit that normal wear such as minor scratches and dents, and cosmetic characteristics like oil canning, are excluded. This isn't a gap; it's standard, because those marks don't affect the roof's job. What the Guardian warranty does cover is the substance: manufacturing defects causing rust, rot, cracking, hail perforation (from stones 1.5 inches or less), and loss of impact resistance, plus a 30-year coating warranty against fade and chalk.
Touch-ups and prevention
The Alunar PVDF finish is engineered to resist scratching and hold its color, so visible scratches are uncommon in normal service. For the rare deep scratch — say from a fallen branch — color-matched touch-up paint is available to blend it in. Prevention is mostly common sense: keep overhanging branches trimmed, avoid dragging ladders or tools across the surface, and don't walk on the roof unnecessarily. For any work requiring roof access, a professional protects both you and the finish.
Frequently Asked Questions
Do scratches and dents hurt a metal roof?
No — minor scratches and small dents are cosmetic and don't affect the roof's watertightness or structure. What matters is functional damage like cracking or puncturing, which a UL 2218 Class 4 roof resists.
Are scratches and dents covered by the warranty?
Generally no — across the industry, warranties exclude cosmetic marks like minor scratches, dents, and oil canning as normal wear. Interlock's Guardian warranty covers functional defects (rust, cracking, hail perforation, loss of impact resistance) and the coating.
Can you touch up a scratch on a metal roof?
Yes. For the rare visible scratch, color-matched touch-up paint blends it in. The durable Alunar PVDF finish resists scratching in the first place, so this is seldom needed.
What is oil canning, and is it a defect?
Oil canning is slight visible waviness in the flat areas of metal panels. It's a cosmetic characteristic of the material, not a defect, and does not affect performance — so it's excluded from warranties industry-wide.
Sources
- Interlock Roofing Ltd. — Guardian Warranty (exclusions) — Cosmetic vs. functional coverage
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Last reviewed 2026-07-11 · Reviewed by Scott Plumptree, Director of Marketing