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Metal Roof Over Asphalt Shingles: Everything You Need to Know
When it’s time to think about replacing your roof, one option that surprises many homeowners is installing a metal roof over asphalt shingles instead of tearing off the old roofing first. This method has been gaining popularity for its cost savings, durability, and simplicity. But like any major home improvement project, it comes with questions: Is it safe? Will it last? Does it work in all climates? This guide breaks down everything you need to know about putting metal roofing over shingles so you can make the best decision for your home.
1. Understanding the Basics
Most homes in North America are roofed with asphalt shingles. They’re cost-effective, familiar to contractors, and widely available. But shingles have a relatively short lifespan—usually 15 to 25 years—depending on quality and weather.
Metal roofing, on the other hand, is built to last. Steel, aluminum, copper, and other metals can endure decades longer than shingles, with some lasting 50 years or more. Installing metal over existing shingles avoids a full tear-off, saving money on labor and disposal while reducing waste.
2. Why Consider a Metal Roof Over Asphalt Shingles?
Here are some of the biggest reasons homeowners consider this option:
- Cost Savings: No tear-off means less labor and disposal fees.
- Durability: Metal roofing resists wind, hail, fire, and extreme temperatures.
- Longevity: Outlasts asphalt by decades.
- Energy Efficiency: Reflective coatings reduce heat absorption, keeping homes cooler in summer.
- Eco-Friendly: Cuts down on landfill waste by leaving the old roof in place.
3. How Does It Work?
Instead of removing the shingles, contractors install the metal roofing panels directly on top. Depending on the system, furring strips may be added to create a flat surface and ventilation gap, or the metal may go on directly with an underlayment in between.
This creates a new weatherproof layer without disturbing the old roof underneath.
4. Pros of Installing Metal Over Asphalt Shingles
A. Saves Money
Tear-offs add thousands of dollars to a roofing project. By skipping this step, you immediately reduce your costs.
B. Faster Installation
Without the messy tear-off, the process goes more quickly, which means less disruption to your daily life.
C. Extra Insulation and Noise Reduction
Keeping the shingle layer adds insulation and sound buffering. Many homeowners find their homes quieter after upgrading.
D. Long-Term Investment
While the upfront cost of metal roofing is higher than shingles, you may never need to replace it again, especially if you plan to stay in your home long term.
5. Cons of Installing Metal Over Asphalt Shingles
A. Added Weight
Asphalt shingles plus metal roofing add more weight. Most homes can handle it, but older homes may need structural evaluation.
B. Hidden Problems
Leaving shingles in place means you might not discover underlying issues like rotting decking or leaks until later.
C. Uneven Surface
If shingles are curled or warped, they can create bumps under the metal. Furring strips usually solve this.
D. Future Removal
When it eventually comes time to replace the metal, you’ll have multiple layers to remove.
6. Types of Metal Roofing Suitable for This Method
Not all metal roofing is the same. Here are the most common types installed over asphalt shingles:
- Standing Seam Metal Roofing – Long vertical panels with concealed fasteners, sleek and durable.
- Metal Shingles – Shingle-shaped pieces that mimic slate, tile, or wood shake.
- Corrugated Metal Panels – Wavy sheets, often used in barns but also on residential homes for a rustic look.
Each has its pros and cons in terms of appearance, cost, and performance.
7. Lifespan: How Long Will It Last?
One of the biggest reasons to choose metal is longevity.
- Asphalt shingles: 15–25 years.
- Metal roofing: 40–70 years depending on material.
That’s potentially three times the lifespan of shingles. When installed correctly, a metal roof can outlive multiple generations of asphalt roofs.
8. Cost Breakdown
The cost of a new roof always depends on size, material, and labor, but here’s a rough idea:
- Tear-off asphalt roof replacement: $7,000–$12,000 for an average home.
- Metal roof over shingles: $9,000–$15,000 (but with a much longer lifespan).
While the upfront cost of metal is higher, skipping the tear-off narrows the price gap considerably. Over decades, the investment pays for itself by avoiding another replacement.
9. Energy Efficiency Benefits
Metal reflects solar heat, reducing cooling costs in summer by up to 25%. Many systems include special reflective coatings designed for maximum efficiency.
Asphalt shingles, by contrast, absorb heat, which can drive up air conditioning bills. Adding a metal layer over shingles creates a thermal break that further improves efficiency.
10. Noise Concerns: Myth vs. Reality
One of the most common worries about metal roofing is noise during rain or hail. In reality, when installed over shingles (with underlayment or furring strips), the roof is no louder than asphalt. The extra shingle layer actually dampens sound.
11. Weather Resistance
Metal roofing shines when it comes to protecting your home.
- Wind: Can withstand gusts up to 120 mph or more depending on system.
- Hail: Metal resists impact better than shingles.
- Fire: Metal is non-combustible.
- Snow/Ice: Snow slides off more easily, preventing ice dams.
This makes it ideal for regions with extreme weather conditions.
12. Environmental Considerations
Metal roofing is often made of recycled material and is 100% recyclable at the end of its life. By not tearing off shingles, you keep tons of waste out of landfills. For eco-conscious homeowners, this is a big win.
13. Installation Process Step by Step
- Inspection: Contractors evaluate the existing shingles and decking.
- Preparation: Underlayment or furring strips are added.
- Panel or Shingle Installation: Metal is secured using proper fasteners.
- Flashing and Sealing: Critical areas like chimneys and valleys are waterproofed.
- Final Check: Ensure ventilation, alignment, and sealing are correct.
14. Can Every Roof Handle It?
Not always. Before installing a metal roof over shingles, contractors look for:
- Number of shingle layers: Most codes allow one layer under metal, sometimes two.
- Roof structure strength: Rafters and decking must support the weight.
- Condition of shingles and decking: Severe rot or damage needs fixing first.
15. Maintenance Expectations
Metal roofing requires far less maintenance than asphalt shingles. Key tasks include:
- Checking for loose fasteners.
- Inspecting flashing around penetrations.
- Clearing debris from valleys and gutters.
Compared to the frequent repairs shingles need, metal is nearly worry-free.
16. Aesthetic Choices
Modern metal roofing comes in dozens of colors, finishes, and styles. You can choose traditional silver, bold reds, earthy browns, or matte blacks. Some metal shingles convincingly mimic slate or cedar shake for a high-end look.
17. Resale Value Impact
Homes with metal roofs often sell for more. Buyers recognize the long lifespan and reduced maintenance as valuable upgrades. Installing a metal roof over shingles can improve curb appeal and marketability.
18. Common Myths Debunked
- “Metal attracts lightning.” – False. Metal doesn’t increase the chance of strikes; it safely conducts energy if hit.
- “Metal roofing is always noisy.” – False. Layers underneath dampen sound.
- “Metal will rust quickly.” – False. Modern coatings prevent corrosion.
19. Climate Suitability
- Hot regions: Reflective coatings reduce cooling costs.
- Cold regions: Snow slides off easily.
- Humid regions: Resistant to algae and mold growth.
- Windy regions: With proper installation, metal stands up to hurricanes.
20. The Long-Term Perspective
Installing a metal roof over asphalt shingles isn’t just about today’s savings—it’s about tomorrow’s peace of mind. A roof that lasts half a century or more means fewer worries, fewer repairs, and more protection for your family.
21. FAQs
Q: Can I install metal roofing over two layers of shingles?
Some codes allow it, but it’s better to remove excess layers to avoid too much weight.
Q: Do I still need underlayment?
Yes, underlayment provides moisture protection and smooths the surface.
Q: Will insurance cover a metal roof?
Most policies do, and some even offer discounts because of the durability.
Q: How long does installation take?
Typically 2–5 days, depending on roof size and complexity.
22. Is It the Right Choice for You?
If you’re considering a roof replacement, think about your budget, how long you plan to stay in your home, and what weather challenges your region faces. A metal roof over asphalt shingles is a great option for many, combining cost savings with long-term durability.
23. Final Thoughts
A roof is one of the most important investments you’ll make in your home. Installing a metal roof over asphalt shingles can save you money upfront, extend the lifespan of your roof, and give your house a fresh, modern look. While it’s not ideal for every home, for many homeowners it’s the perfect balance of practicality and performance.
When considering your options, weigh the pros and cons, consult a trusted contractor, and think long-term. With proper installation, a metal roof can give you decades of peace of mind and protection. 440-235-3124
