Asphalt fails first by UV.
Asphalt shingles are fiberglass mats coated in asphalt and topped with mineral granules. The granules are sacrificial. They protect the asphalt from UV. In 115°F Arizona summers with intense UV, granule loss is dramatically faster than in temperate climates. Within 10-15 years, the asphalt under the granules is cooking. Within 15-25 years, the roof is brittle, faded, and shedding into your gutters.
Metal solves the desert problem.
A 24-gauge steel panel coated in Kynar 500 PVDF doesn’t have granules to lose. The paint is chemically bonded to the metal at high temperature. It carries a 30-year fade warranty (≤5 ΔE color shift). The panel itself is rated for 50+ years. In Arizona, that’s literally the difference between buying one roof versus three.
What about the upfront cost?
Asphalt is cheaper to buy. Always has been. But on a 50-year horizon:
- 3 asphalt re-roofs at $12k each = $36k
- 1 metal roof = $20-30k
- Plus 50 years of 10-30% cooling savings
- Plus 10-35% insurance premium discount
- Plus higher resale value
The math flips in the homeowner’s favor by year ~20.
What we’d recommend.
For most Arizona homes, asphalt is a false economy. If the budget genuinely won’t stretch to metal, asphalt-then-metal is fine. But if you’re going to be in the home long enough to see a re-roof cycle, the metal-now decision usually wins.
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