Can I Put A Metal Roof Over Shingles?

Thinking about upgrading your roof? If you’ve ever wondered whether it’s possible to put a metal roof over shingles, then you’re in the right place. In this article, we’ll explore the feasibility of installing a metal roof directly over your existing shingles. So, before you embark on your roofing adventure, let’s find out if this option is a go or a no-go!

Can I Put A Metal Roof Over Shingles?

Legal Considerations

Building Codes and Regulations

Before considering installing a metal roof over shingles, it’s important to understand the building codes and regulations in your area. Building codes vary from place to place, so it is crucial to check with your local authorities to ensure that installing a metal roof over shingles is allowed. Some areas may have specific rules and restrictions regarding roof replacement or modification. It’s always a good idea to consult with a professional roofing contractor who is familiar with local regulations.

Permits and Approvals

In addition to understanding building codes, obtaining the necessary permits and approvals is another crucial step. Installing a metal roof over shingles may require a permit from your local building department. This is typically done to ensure that the installation complies with safety standards and regulations. It’s essential to acquire the appropriate permits before starting the installation process to avoid any legal issues down the line.

Benefits of Installing a Metal Roof Over Shingles

Cost Savings

One of the significant benefits of installing a metal roof over shingles is cost savings. By opting for this method, you can avoid the expenses associated with removing the old shingles. Removing shingles can be a labor-intensive and time-consuming process, requiring additional labor and dumpster rentals. By layering the metal roof over the shingles, you save both time and money.

Energy Efficiency

Metal roofs are known for their energy efficiency. By installing a metal roof over shingles, you can enhance your home’s energy performance. Metal roofs have excellent reflective properties, which can help reduce heat absorption from the sun, thereby keeping your home cooler in the summer. This can result in lower energy bills by reducing the need for air conditioning.

Durability and Longevity

Another significant benefit of metal roofs is their durability and longevity. Installing a metal roof over shingles can provide an additional layer of protection to your home. Metal roofs are resistant to fire, rot, and insect damage, making them a long-lasting option. With proper maintenance, metal roofs can last up to 50 years or more, far surpassing the lifespan of traditional asphalt shingle roofs.

Can I Put A Metal Roof Over Shingles?

Factors to Consider

Weight of Metal Roofing Materials

One crucial factor to consider when installing a metal roof over shingles is the weight of the materials. Metal roofs are generally heavier than traditional asphalt shingles. Before proceeding with the installation, it’s important to have your roof structure assessed to ensure it can withstand the additional weight. Hiring a qualified roofing contractor who can evaluate your roof’s load-bearing capacity is recommended.

Condition of Existing Shingles

The condition of the existing shingles is another factor to consider. If your shingles are severely damaged or in poor condition, it may be necessary to remove them before installing the metal roof. This is because the metal roof needs a stable and solid substrate for proper installation. A professional inspection is crucial to determine whether the existing shingles can serve as a suitable base for the metal roof.

Roofing Structure

The structure of your roofing system plays a significant role in determining whether installing a metal roof over shingles is feasible. The metal roof will be installed over the existing shingles, so it’s essential to ensure that the roof structure is in good condition. Any structural issues, such as sagging or compromised support beams, should be addressed before the installation. Reinforcement may be required in some cases.

Potential Moisture Issues

Moisture issues can arise when installing a metal roof over shingles if proper precautions are not taken. The metal roof should be installed with a proper ventilation system to prevent any moisture buildup. This is especially important in areas with high humidity or when transitioning from a non-vented roofing system. It’s crucial to consult with a roofing professional who can recommend appropriate ventilation solutions.

Compatibility and Warranty

Before proceeding with the installation, it’s essential to consider the compatibility of the metal roof with your existing shingles. Not all metal roofs are compatible or recommended for installation over shingles. You should consult with a roofing expert who can advise on the best metal roofing system for your specific situation. Additionally, ensure that the metal roofing manufacturer’s warranty covers installation over shingles to protect your investment.

Preparation and Inspection

Roofing Inspection

Before installing a metal roof over shingles, a thorough roofing inspection should be conducted. This inspection will assess the overall condition of your roof and determine if there are any underlying issues that need to be addressed before installation. A professional roofer will inspect for leaks, damaged shingles, and any other potential problems that could compromise the installation process.

Mold and Rot Assessment

Mold and rot assessment is crucial to identify any hidden moisture issues that may be present in the existing shingles or underlying structures. If mold or rot is detected, it must be remediated before proceeding with the metal roof installation. Moisture trapped between the shingles and the metal roof can lead to further damage and compromise the integrity of the new roofing system.

Determining Permissible Weight

As mentioned earlier, determining the permissible weight that your roof structure can bear is essential. A qualified roofing contractor will assess the load-bearing capacity of your roof and determine if it can support the weight of the metal roof materials. This evaluation is necessary to prevent any potential structural damage due to excess weight.

Removal of Loose Shingles

It’s important to remove any loose or damaged shingles before installing the metal roof. Loose shingles can create an uneven surface and negatively impact the metal roof’s performance. A professional contractor will carefully remove any loose or damaged shingles, ensuring a smooth and stable substrate for the metal roof installation.

Repairing Damaged Substrate

Any damaged substrate should be repaired before proceeding with the metal roof installation. This includes repairing any rotted or weakened areas of the roof decking or underlayment. It’s crucial to have a solid and stable substrate to ensure the metal roof’s durability and longevity.

Flashing Assessment

Flashing assessment is essential to evaluate the condition of the existing flashings on your roof. Flashings play a critical role in preventing water infiltration at vulnerable areas such as chimneys, vents, and skylights. Any damaged or deteriorated flashings should be replaced before installing the metal roof to maintain a watertight seal.

Can I Put A Metal Roof Over Shingles?

Installation Process

Choosing the Right Metal Roofing System

Choosing the right metal roofing system is crucial for a successful installation over shingles. There are various types of metal roofs available, including standing seam, metal shingles, and corrugated panels. Each type has its own advantages and characteristics. Consulting with a roofing expert will help you select the best metal roofing system based on your preferences, climate, and budget.

Preventing Condensation

Condensation can be a concern when installing a metal roof over shingles, as it can lead to moisture-related problems. Proper ventilation and insulation should be installed to prevent condensation buildup. Adequate ventilation allows moisture to escape, while insulation helps to regulate temperature and minimize condensation. This is particularly important in regions with high humidity or extreme temperature fluctuations.

Installation Techniques

The installation techniques for installing a metal roof over shingles may vary depending on the specific metal roofing system chosen. Following manufacturer guidelines and industry best practices is essential to ensure a proper installation. It’s recommended to hire an experienced and qualified roofing contractor who has expertise in installing metal roofs over shingles.

Fastener Selection

The selection of appropriate fasteners is important to ensure the stability and durability of the metal roof. Fasteners should be corrosion-resistant and compatible with the metal roofing system being installed. Using the wrong type of fasteners can lead to premature deterioration and compromise the integrity of the roof. A professional roofing contractor will choose the appropriate fasteners for your specific metal roofing system.

Flashing and Sealant Application

Proper flashing and sealant application is crucial to maintain a watertight seal and prevent water infiltration. Flashings should be installed at vulnerable areas to redirect water away from critical junctions. Additionally, sealants should be applied to create a secure bond between the metal roof panels and flashings. It’s essential to use high-quality sealants to ensure long-term protection against leaks.

Potential Challenges and Risks

Voiding Warranty

Installing a metal roof over shingles without following the manufacturer’s guidelines may void the warranty. It’s crucial to ensure that the metal roof installation complies with the warranty requirements to take advantage of any protections offered. Hiring a professional roofing contractor who is experienced in installing metal roofs over shingles can help avoid warranty issues.

Compromised Roof Ventilation

Improper ventilation during the installation of a metal roof over shingles can compromise the overall performance of the roofing system. Inadequate ventilation can lead to excess heat buildup, condensation issues, and potential mold growth. It’s essential to work with a roofing professional who can assess your ventilation needs and ensure proper installation.

Potential for Trapped Moisture

If moisture becomes trapped between the shingles and the metal roof, it can lead to mold growth and other moisture-related problems. Proper installation techniques, including ventilation and insulation, are crucial in preventing trapped moisture. Following industry best practices and working with an experienced roofer will minimize the potential for moisture-related issues.

Uneven Roof Surface

Installing a metal roof over shingles can result in an uneven surface due to the varying heights of the shingles. This can pose challenges during the installation process and affect the overall appearance of the metal roof. It’s important to work with a skilled roofing contractor who can address the unevenness and ensure a smooth and aesthetically pleasing installation.

Can I Put A Metal Roof Over Shingles?

Professional Assistance

Consultation with Roofing Experts

Consulting with roofing experts is highly recommended before proceeding with the installation of a metal roof over shingles. They will provide valuable insights and guidance based on their expertise and knowledge. Roofing experts can assess your specific situation, evaluate potential risks, and provide recommendations tailored to your needs.

Hiring a Qualified Contractor

Hiring a qualified roofing contractor is crucial to ensure a successful installation of a metal roof over shingles. A professional contractor will have experience in this specific installation method and will follow industry best practices. They will have the necessary skills and tools to handle the complexities of the project, ensuring a high-quality and long-lasting metal roof.

Cost Considerations

Installation Costs

The cost of installing a metal roof over shingles can vary depending on several factors, including the size of your roof, the type of metal roofing system chosen, and the complexity of the installation. While the initial cost may be higher compared to traditional shingle replacement, the long-term cost savings and increased durability of a metal roof can make it a worthwhile investment.

Potential Cost Savings

Opting for a metal roof over shingles can result in significant cost savings in various ways. By avoiding the costs associated with shingle removal and disposal, you can save on labor and dumpster rental fees. Additionally, metal roofs are known for their durability and longevity, requiring fewer repairs and replacements over time. This can lead to long-term cost savings in maintenance and roof replacements.

Return on Investment

Installing a metal roof over shingles can provide a solid return on investment. Metal roofs are highly valued in the real estate market due to their durability, energy efficiency, and aesthetic appeal. A metal roof can increase the resale value of your home and attract potential buyers. Additionally, the long lifespan of a metal roof means you’ll enjoy its benefits for many years, providing an excellent return on your initial investment.

Can I Put A Metal Roof Over Shingles?

Maintenance and Care

Inspections and Cleanings

Regular inspections and cleanings are essential to maintain the performance and longevity of a metal roof installed over shingles. Inspections should be conducted at least once a year to check for any damage, loose panels, or potential issues. Cleanings should be performed to remove debris, leaves, and other debris that can accumulate on the roof surface and affect its functionality.

Repairs and Replacements

While metal roofs are highly durable, they may still require occasional repairs or replacements over time. Any damage or loose panels should be addressed promptly to prevent further issues. It’s important to work with a professional roofing contractor for repairs and replacements to ensure proper installation and maintain the integrity of the metal roof.

Snow and Ice Removal

If you live in an area with heavy snowfall or ice accumulation, it’s important to remove these elements from your metal roof to prevent damage. Accumulated snow and ice can put excessive weight on the roof and potentially cause structural issues. Using snow rakes or hiring professional snow removal services can help prevent any potential damage.


Installing a metal roof over shingles can offer numerous benefits, including cost savings, energy efficiency, and increased durability. However, it’s crucial to consider the factors outlined in this article and consult with roofing experts to ensure a successful installation. By thoroughly assessing your roof’s condition, following industry best practices, and hiring a qualified roofing contractor, you can enjoy the advantages of a metal roof while maintaining the integrity of your home.

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