Across Illinois, more homeowners are exploring durable roofing alternatives that can handle everything from summer storms to icy winters. One question that often arises is whether a metal roof can be installed directly over existing shingles.

The idea is appealing — skip the messy tear-off, save time, and enjoy the benefits of a long-lasting metal roof. But while this approach can work under certain circumstances, it’s not always the best option for every home. In this post, we’ll explain how the process works, when it’s allowed, and what to weigh before deciding.

The Growing Interest in Metal Roofing

Over the past decade, metal roofing has moved from industrial buildings and barns into mainstream residential neighborhoods. Homeowners are attracted to its sleek appearance, exceptional lifespan, and energy efficiency.

A properly installed metal roof can last two or three times longer than asphalt shingles, sometimes up to 70 years. It can withstand strong winds, resist fire, and shed snow easily — all important qualities for homes in Illinois, where weather can swing from one extreme to another.

Other reasons metal roofs have gained attention include:

• A wide range of finishes, from modern standing seam to traditional textured panels.
• Reflective coatings that reduce summer cooling costs.
• Lightweight materials that put less stress on structural framing.
• Recyclability, making them one of the more sustainable roofing options on the market.

Because of these strengths, some homeowners wonder if they can simply place new metal panels over their current shingles rather than tearing everything off.

Can You Really Install Metal Over Asphalt Shingles?

Technically, yes — it’s possible in many cases. But as with most construction projects, the answer depends on the condition of your existing roof and your local building regulations.

Before any installation begins, the roof must be inspected to determine if it can support another layer. Metal roofing is relatively light compared to tile or slate, but even a small amount of added weight can cause stress if the structure underneath is weak or damaged.

A few key checks include:

1. Decking strength: Roof decking should be solid and free from rot or sagging.
2. Shingle health: If shingles are severely curled, cracked, or waterlogged, they can’t serve as a stable base.
3. Ventilation: Adequate airflow beneath the roof surface prevents condensation buildup.
4. Building codes: Some Illinois municipalities restrict roofing overlays to two total layers. Always confirm with your local building department.

If your current roof passes these inspections, installing metal over shingles can be a practical and efficient solution.

How the Process Works

The steps for installing a metal roof over shingles differ slightly from a full replacement but follow the same core principles of protection and alignment.

1. Detailed inspection: The old roof is checked for damage, moisture, and weak areas.
2. Preparation: Contractors may apply a protective underlayment or install furring strips to create a flat, ventilated surface.
3. Panel layout: Metal panels are measured and cut to fit the roof’s exact dimensions, then fastened securely using specialized hardware.
4. Flashing installation: Critical points like valleys, chimneys, and vents are sealed to keep water out.
5. Finishing touches: Ridge caps, trim, and fastener covers complete the job for a clean look and weatherproof finish.

When properly executed, this method can extend the life of your roof without the noise and debris of a full tear-off.

Advantages of Installing Metal Roofing Over Shingles

1. Cost savings
One of the most attractive benefits is financial. Avoiding the tear-off stage saves on labor, landfill fees, and disposal costs. Those savings can be significant, especially on large roofs.

2. Less waste
By leaving the existing shingles in place, homeowners keep old materials out of landfills — an environmentally friendly approach that aligns with sustainable construction practices.

3. Shorter project timeline
Skipping demolition allows installation to move quickly. Many metal roof overlays can be completed in days rather than weeks.

4. Added insulation
The old shingles act as a mild insulating layer, which may slightly improve energy efficiency and noise reduction during rain or hail.

Potential Disadvantages

1. Hidden structural damage
If the underlying decking or attic framing has unseen moisture damage, covering it with new material can trap water and worsen the issue over time.

2. Uneven surfaces
Old shingles can create small bumps that make the metal panels harder to align properly, leading to gaps or visible irregularities.

3. Condensation issues
Without the correct underlayment and ventilation, condensation can form between the layers, potentially causing rust or mold.

4. Code and warranty limitations
Some roofing manufacturers void warranties for installations over old shingles, and not every Illinois county allows multiple roof layers. Always verify both before starting.

When a Tear-Off Might Be the Better Option

Although overlaying metal on shingles can be done safely, there are times when a complete removal makes more sense:

• The roof deck is soft or water-damaged.
• Shingles are curled, missing, or severely aged.
• Multiple roofing layers already exist.
• You plan to add new insulation or repair attic framing.

In these cases, starting fresh provides a stronger foundation and often results in a longer-lasting roof overall.

Cost Considerations

The price of a metal roof in Illinois varies depending on the style of panel, the size of the home, and the complexity of the roof design. While it’s typically more expensive upfront than asphalt shingles, the extended lifespan and minimal maintenance often make it cost-effective in the long run.

Installing metal over shingles can further reduce costs because there’s no need for tear-off labor or disposal fees. However, a professional inspection should always come first — skipping that step could lead to bigger expenses later if structural issues are overlooked.

Frequently Asked Questions

Will installing metal over shingles make the roof louder during rain?
Not necessarily. Modern underlayments and solid roof decks absorb much of the sound, keeping noise levels comparable to standard shingle roofs.

Does a metal roof increase home value?
In most cases, yes. Buyers recognize the long-term benefits and low maintenance of metal roofing systems.

Can I install a metal roof myself?
DIY installation is not recommended. Metal roofing requires precision measurements, specialized tools, and safety expertise.

Final Takeaway

For many Illinois homeowners, installing a metal roof over existing shingles can be a practical and environmentally friendly option. It reduces waste, shortens installation time, and delivers decades of durability when done properly.

However, every roof has its own story. Structural health, local building codes, and ventilation design all determine whether this method makes sense for your home. Consulting with an experienced roofing professional ensures the decision you make adds value, protection, and efficiency for years to come.

Cupples Construction shares educational resources like this to help homeowners make informed choices about their property — from understanding construction methods to planning future renovations. Knowledge is the best foundation for any successful home improvement project.

Additional Home Exterior Services

Beyond roofing, Cupples Construction also provides gutter services and siding services to help protect and enhance your home’s exterior. If you’re a homeowner in Peoria, IL, our expert team is ready to improve your property’s durability, energy efficiency, and curb appeal with trusted exterior solutions tailored to Illinois weather conditions..

Schedule Your Free Roof Inspection

If you’re looking for reliable roofing services, Cupples Construction is ready to help. Our team will guide you through every step, provide expert advice, and ensure your roof is built to last.

Call us today at (309) 826-4377 or request your free estimate online to get started protecting your home or business.