Many homeowners wonder if they can combine a metal roof with existing asphalt shingles. The answer is yes—and it can be a smart move if done right. Combining the two materials helps save on labor costs, adds extra protection, and gives your home a modern, long-lasting look. This guide breaks down how to do it safely and effectively.
Why Combine Metal Roofing with Asphalt Shingles?
If your current asphalt shingles are nearing the end of their life but still structurally sound, adding a metal roof on top can save time and money. According to Angi’s roofing guide, this method can cut labor costs by up to 25% because you skip the tear-off process. Metal roofs are also known for lasting 40 to 70 years—much longer than shingles, which typically last 15 to 30 years.
Homeowners love the look, too. “We installed metal panels over our old shingles last year,” says one homeowner on Reddit’s Home Improvement forum. “It not only looks great, but we’ve noticed our energy bills are lower during the summer.” That’s because metal reflects sunlight, keeping your home cooler and more efficient.
Step 1: Check If Your Roof Is a Good Candidate
Before installation, make sure your roof is in good shape. The existing shingles should lie flat without curling or lifting. The structure underneath—your decking and trusses—must be solid enough to handle the added weight of the metal panels.
You can find expert inspection tips on HomeAdvisor’s roofing resource. It’s best to have a professional roofer inspect your home before starting. Some local building codes may require permits or limit how many roof layers you can have.
Step 2: Add the Right Underlayment
Underlayment is key to preventing moisture damage. A synthetic or felt underlayment provides a water-resistant layer between the old shingles and the new metal panels. This step also helps reduce noise and improves insulation.
As one contractor on Quora’s roofing discussion explains, “It’s like adding a weatherproof shield between your old and new roof—it’s essential for long-term protection.”
Step 3: Install Furring Strips for Ventilation
Adding wooden furring strips or a vented framing system creates a small air gap between the shingles and the metal panels. This gap promotes airflow, preventing condensation buildup that could lead to rot. It also helps maintain even temperatures under the roof.
Think of it as giving your roof a way to “breathe.” This step ensures that moisture doesn’t get trapped, extending the lifespan of both materials.
Step 4: Lay and Secure Metal Panels
Once the prep work is done, metal panels can be laid directly over the furring strips. Panels are fastened with screws or clips, depending on the system you choose. Make sure edges and seams are sealed properly to avoid water leaks.
For visual consistency, choose a color and finish that complement your home’s exterior. A matte finish often blends better with asphalt shingles, while glossy finishes provide a modern contrast.
Pros and Cons to Consider
According to Energy.gov’s roofing materials guide, metal roofs are among the most energy-efficient options available. They reflect solar heat, helping homeowners save up to 25% on cooling costs.
Pros:
- Long lifespan (up to 70 years)
- Energy savings through heat reflection
- Lower maintenance compared to shingles
- Adds resale value to your home
Cons:
- Higher upfront cost
- May require additional insulation to reduce rain noise
- Not suitable for severely damaged shingle roofs
Conclusion
Combining a metal roof with asphalt shingles is a practical, cost-saving solution for homeowners looking to upgrade their roofing without a full replacement. It offers better protection, longer lifespan, and improved energy efficiency—all while maintaining your home’s style.
Before starting, always consult a roofing professional to inspect your current roof and ensure compliance with local codes. To explore more real-world homeowner experiences, check out this Quora discussion.
