Pros and Cons of Putting Metal Roof Over Shingles: Pally Roofing Guide

Metal Roof Over Shingles

In this article, we will explore the pros and cons of putting metal roof over shingles, providing a comprehensive guide to help you make an informed decision. We will explore durability, cost, energy efficiency, and potential issues like condensation and structural weight concerns. Understanding these factors lets you determine if this roofing solution aligns with your needs and circumstances.

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Understanding Metal Roof Over Shingles

Explanation of the Concept

Installing a metal roof over existing shingles involves placing a new metal roofing system directly on top of the current shingle roof. This approach eliminates the need to remove the old shingles, making the installation process faster and less labor-intensive.

Common Reasons for Opting for Metal Roofs Over Shingles

  1. Cost Efficiency: Avoiding the removal of old shingles reduces labor costs and minimizes waste disposal fees.
  2. Durability: Metal roofs have a longer lifespan and better resistance to weather conditions than traditional shingles.
  3. Energy Efficiency: Metal roofs reflect solar heat, lowering cooling costs during hot weather.
  4. Environmental Considerations: Metal roofing materials are often made from recycled content and can be recycled again at the end of their lifespan.
  5. Aesthetic Appeal: Metal roofs offer a modern look, with various styles and color options to enhance a home’s curb appeal.

Overview of the Process

  1. Inspection and Assessment: The existing shingle roof is thoroughly inspected to ensure it can support the additional weight of the metal roof.
  2. Preparation: Any necessary repairs to the existing shingles are made, and a layer of underlayment is added to provide a moisture barrier.
  3. Installation: Metal panels or shingles are installed over the prepared surface, secured with fasteners and sealing materials.
  4. Finishing Touches: Flashing, trim, and other finishing components are added to ensure a watertight and aesthetically pleasing result.

Installing a metal roof over shingles can offer numerous benefits, but it’s essential to consider all factors to make the best decision for your home.

What are the Pros and Cons of Putting Metal Roof Over Shingles:

Pros of Putting a Metal Roof Over Shingles

Longevity and Durability

One of the most significant advantages of metal roofing is its longevity. Metal roofs can last 40 to 70 years, far outlasting traditional asphalt shingles, typically lasting 20 to 30 years. Additionally, metal roofs offer superior resistance to extreme weather conditions, including high winds, heavy snow, hail, and fire.

Energy Efficiency

Metal roofs are highly reflective, which helps reduce heat absorption. This reflective property can lead to significant energy savings, particularly in warmer climates, as it reduces the need for air conditioning and helps maintain a cooler indoor environment.

Aesthetic Appeal

Metal roofs provide a modern and sleek appearance that can enhance the overall look of your home. They are available in various styles and colors, allowing homeowners to choose an option that complements their home’s architecture and personal taste.

Ease of Installation

Installing a metal roof over existing shingles is less labor-intensive than a complete roof replacement, as it eliminates the need to remove the old shingles. This speeds up the installation process and reduces labor costs and the disruption to your home.

Environmental Benefits

Metal roofing materials are often made from recycled content, making them an eco-friendly choice. Furthermore, metal roofs can be fully recycled at the end of their lifespan. Installing a metal roof over shingles reduces waste, as there is no need to dispose of the old roofing materials.

Considering these benefits, it’s clear why many homeowners are choosing metal roofs over shingles. 

Metal Roof Over Shingles Problems (Cons)

Potential Moisture Problems

Risk of Trapped Moisture: Installing a metal roof over shingles can trap moisture, leading to mold and rot. It’s crucial to have proper ventilation and a moisture barrier to prevent this.

Alignment and Fit Issues

Challenges in Proper Fit: Uneven shingles can make achieving a seamless fit with the metal roof difficult. Professional installation is essential to ensure proper alignment and minimize potential issues.

Difficulty in Repair

Complexity in Repairs: Repairing leaks or damages on a metal roof over shingles can be more complex than traditional shingles. It often requires specialized knowledge and materials, leading to longer repair times. Professional assistance is recommended for efficient and effective repairs.

Considering these potential drawbacks is essential when deciding whether a metal roof over shingles is the right choice for your home. For expert guidance and professional installation services, Pally Roofing is here to help you make the best decision for your roofing needs.

Metal Roof Over Shingles Condensation:

Causes of Condensation

Condensation can occur when warm, moist air from inside the home rises and meets the more excellent metal roof surface. The temperature difference between the warm interior and the cool metal roof can cause moisture in the air to condense on the underside of the metal roofing.

Prevention Measures

  • Proper Ventilation Techniques: Adequate ventilation is crucial to allow moist air to escape and prevent it from accumulating under the roof. Ridge vents, soffit vents, and other ventilation systems can help maintain airflow.
  • Use of Vapor Barriers and Insulation: Installing vapor barriers can prevent moisture from reaching the metal roof surface, while proper insulation can help maintain a consistent temperature and reduce the risk of condensation.

Long-term Solutions

  • Regular Maintenance and Inspections: Conduct regular inspections to identify and address potential condensation issues early. Maintenance should include checking the ventilation system and ensuring it is functioning correctly.
  • Ensuring Proper Airflow and Humidity Control: Maintaining proper airflow and controlling indoor humidity levels can significantly reduce the risk of condensation. Dehumidifiers and proper HVAC systems can help manage indoor humidity effectively.

By understanding the causes of metal roof over shingles condensation and implementing these prevention and long-term solutions, you can minimize the risk of moisture problems when installing a metal roof over shingles.

Is Metal Roof Over Shingles Good or Bad?

Evaluating Your Specific Situation

  • Assessing the Condition of Existing Shingles: Ensure the current shingles are in good condition and not severely damaged.
  • Structural Integrity of Your Home: Confirm that your home’s structure can support the additional weight of a metal roof.

Weighing the Pros and Cons

  • Balancing Benefits Against Potential Issues: Consider advantages like durability and energy efficiency versus potential drawbacks such as cost and noise.
  • Long-term vs. Short-term Considerations: Evaluate the immediate costs against long-term benefits and savings.

Expert Opinions and Case Studies

  • Insights from Roofing Professionals: Seek expert advice to understand if this solution suits your specific needs.
  • Real-life Examples of Successful Installations: To gauge potential outcomes, look at case studies of homes that have successfully installed metal roofs over shingles.

By thoroughly evaluating these factors, you can determine whether installing a metal roof over shingles is a good choice for your home. For personalized advice and expert installation, Pally Roofing is here to help.


In summary, installing a metal roof over shingles offers numerous benefits, including enhanced durability, energy efficiency, and aesthetic appeal. However, it has potential drawbacks, such as higher upfront costs, weight concerns, and condensation issues. Carefully evaluating the condition of your existing shingles and the structural integrity of your home is crucial.

For professional advice and top-quality roofing services, contact Pally Roofing. Our experienced team specializes in metal roofing installation and is dedicated to providing reliable, efficient, and expert service. Schedule your consultation with Pally Roofing today to ensure the best outcome for your roofing project.


Can a metal roof be installed over existing shingles?

It's possible to install a metal roof over existing shingles. This method can save time and labor compared to removing the old shingles.

How long does a metal roof over shingles last?

Metal roofs have a lifespan of 40 to 70 years, significantly longer than traditional asphalt shingles.

Will installing a metal roof over shingles increase the weight of my home's structure?

Yes, adding a metal roof over shingles will increase your home's weight load. Ensuring your home's structure can support the additional weight is essential.

Are there any energy efficiency benefits to installing a metal roof over shingles?

Metal roofs are highly reflective, reducing heat absorption and potentially lowering cooling costs.


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