Metal and asphalt are the two dominant roofing materials for commercial properties, yet they differ dramatically in upfront cost, lifespan, and maintenance demands. Understanding these differences helps you avoid expensive mistakes and choose what actually works for your building type and climate. This guide breaks down the real numbers and durability factors so you can make a confident decision.
Initial Installation Cost
Asphalt roofing remains the cheaper entry point. Standard asphalt shingles or built-up asphalt systems typically run $3–$7 per square foot installed, making them ideal for budget-conscious projects. Metal roofing costs significantly more upfront: $7–$15 per square foot depending on metal type (aluminum, steel, or copper) and panel style.
For a 10,000 sq. ft. commercial roof:
- Asphalt: $30,000–$70,000
- Metal: $70,000–$150,000
That 2–3x premium for metal deters many property owners initially, but the long-term math often favors metal when you factor in replacement cycles.
Lifespan & Replacement Frequency
Asphalt roofs typically last 15–20 years in moderate climates, dropping to 10–15 years in hot or humid regions. Commercial asphalt systems need re-coating or restoration every 5–7 years to maintain warranty coverage and prevent leaks.
Metal roofs outpace asphalt significantly. Standing seam metal systems routinely last 40–70 years with minimal intervention. Corrugated or ribbed metal panels fall in the 20–40 year range. Over a 50-year property lifespan, you'll replace an asphalt roof 2–3 times but only replace metal once—or not at all.
Durability in Harsh Conditions
Asphalt limitations:
- Softens and degrades in intense UV exposure
- Becomes brittle in cold climates, prone to cracking
- Prone to algae and moss growth in wet regions
- Susceptible to wind damage (typical wind rating: 60–90 mph)
Metal advantages:
- Reflects solar heat (reduces cooling costs 10–25%)
- Handles extreme cold without embrittlement
- Resists algae and doesn't absorb moisture
- Rated for 110–150+ mph winds
- Fire-resistant (Class A rating standard)
For coastal, desert, or northern climates with freeze-thaw cycles, metal's durability advantage becomes critical.
Maintenance & Hidden Costs
Asphalt requires proactive maintenance to reach its 15–20 year potential. Plan on:
- Roof inspections every 1–2 years ($500–$1,500 per visit)
- Resealing or re-coating every 5–7 years ($1–$3 per sq. ft.)
- Debris removal and gutter cleaning quarterly
- Leak repairs accelerate after year 10
Metal roofs demand far less. Annual gutter cleaning and occasional screw replacement are typical. No resealing required. Leaks rarely occur if installed correctly, and when they do, repairs are straightforward—replacing a panel section costs $200–$500 versus patching asphalt ($300–$800 each time).
Tax Incentives & Rebates
Metal roofs qualify for solar tax credits in many jurisdictions if you pair them with solar panels. Some municipalities offer rebates for cool roofs (high-reflectance surfaces) to reduce urban heat island effect. Asphalt roofs rarely qualify unless they're specially coated for reflectivity.
Check your state's energy office or local utility programs—incentives can reduce net metal cost by 10–20%.
Weight & Structural Considerations
Asphalt-built-up systems weigh 8–15 lbs per sq. ft. Metal roofing weighs 1–3 lbs per sq. ft., making it ideal for retrofits where existing structures can't handle heavy loads. If your building is older or has marginal roof framing, metal is the safer choice.
Choosing Between Them
Pick asphalt if:
- Budget is tight and replacement is 15+ years away
- Your building is low-traffic and doesn't require cool roof benefits
- You're comfortable with regular maintenance cycles
Pick metal if:
- You plan to own the building 20+ years
- Climate extremes (coast, desert, snow belt) apply
- Energy efficiency and tax incentives matter
- Low maintenance is a priority
Working With Roofing Providers
Comparing quotes from multiple contractors is essential. Get at least three estimates that detail material type, labor, warranty terms (typically 10–20 years on metal, 5–10 on asphalt), and removal costs if replacing. Mercoly helps you compare and find trusted metal and commercial roofing providers in one place, saving time on vetting and ensuring competitive pricing.
Frequently Asked Questions
Q: Does metal roofing rust and require coating replacement? Modern metal roofs use protective finishes (Kynar, polyester) that prevent rust. They don't need recoating—the finish lasts the roof's lifetime.
Q: Can I install metal roofing over my existing asphalt roof? Yes, in most cases, which saves $1–$2 per sq. ft. on removal. Check local building codes and confirm your structure can handle the combined weight.
Q: What's the real wind performance difference between metal and asphalt? Metal standing seam roofs withstand 150 mph winds and higher with near-zero fastener failure. Asphalt shingles start failing at 60–90 mph, especially at edges and penetrations.
Get competing quotes from certified metal and asphalt roofing contractors today—your long-term budget depends on the right choice now.