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Can You Install a Metal Roof Over Shingles?

When contemplating an upgrade from traditional shingles to a metal roof, many homeowners are drawn to its numerous advantages, including its long-lasting nature, energy efficiency, and the enhancement of curb appeal.


However, the thought of removing the existing shingles to make way for a metal roof might seem daunting, both in terms of effort and cost. Is it feasible, then, to install a metal roof directly over the shingles?

Understanding the Feasibility


The short answer is that it's possible, but with some caveats. Installing a metal roof over existing shingles is subject to several considerations that homeowners must weigh before proceeding with the project.


Advantages of Overlaying Metal on Shingles

  • Cost Savings: By avoiding the removal of old shingles, you can save on labor and disposal costs, making the project more budget-friendly.
  • Quicker Installation Time: Without the need for a tear-off, the installation process is expedited, minimizing the disruption to your daily life.
  • Eco-Friendly Choice: Leaving the shingles in place reduces waste, making this option a greener choice.

Challenges and Limitations

  • Regulatory Hurdles: Local building codes may restrict or disallow the installation of metal roofs over multiple layers of existing shingles.
  • Unseen Complications: Skipping the removal of old shingles means potentially overlooking issues with the roof deck, such as rot or structural damage.
  • Additional Weight Concerns: Metal roofs, albeit lightweight, add extra load to your home's structure, which could be a concern over time.
  • Ventilation Issues: The risk of moisture becoming trapped between the shingle and metal layers could promote mold or mildew growth.
  • Drainage Dilemmas: The uneven surface created by shingles might impair the metal roof's ability to drain properly. Overlaying a metal roof may also inhibit the ability to track down the source of a future leak, as the water could find its way travelling along the existing shingles and leak at a different area.
  • Warranty Worries: There's a possibility that the warranty offered by the metal roof manufacturer could be invalidated if the installation does not comply with their guidelines. You should check directly with the manufacturer to ensure that installing on top of existing shingles, will not invalidate the warranty.

Steps to Take Before Making the Choice

  • Verify Local Regulations: Contact your local building authority to check if installing a metal roof over shingles is permissible in your jurisdiction.
  • Professional Assessment: Have your roof inspected by a qualified professional to ascertain if it can support the additional weight and to identify any pre-existing issues.
  • Cost-Benefit Analysis: Weigh the immediate cost savings against potential long-term expenses arising from concealed damages.
  • Selecting a Qualified Contractor: Engage with a reputable metal roofing contractor experienced in such installations to ensure compliance and craftsmanship. Be sure to research company reviews and ensure they have a positive reputation with previous clientele. If you’re on the fence about a company’s reputation, you should ask for references of previous installations and talk to those homeowners directly.
  • Financing: Explore in-house vs third-party financing options and choose which is best for your project and financial situation.


Are Metal Roofs Better Than Shingle Roofs?


Metal roofs and shingle roofs are two popular roofing materials, each with their own set of characteristics, benefits, and drawbacks. Understanding the differences between them can help homeowners make informed decisions based on durability, cost, aesthetic appeal, and other factors.


Material Composition and Durability

  • Metal Roofs: Constructed from materials such as steel, aluminum, copper, or zinc alloys, metal roofs are known for their exceptional durability and longevity. They can last 40 to 70 years, depending on the material. Metal roofs are also highly resistant to wind, fire, and impact from hail.
  • Shingle Roofs: Typically made from asphalt, shingle roofs are the most common roofing material in the United States. They have a shorter lifespan, usually 15 to 30 years. While they provide good protection against environmental elements, they are more susceptible to wind uplift and are not as durable as metal roofs in extreme weather conditions.

Cost and Installation

  • Metal Roofs: The initial cost of a metal roof is higher than that of a shingle roof, reflecting its durability and longevity. Metal roofs can be more complex to install, often requiring specialized skills and tools, which can add to the overall cost.
  • Shingle Roofs: Asphalt shingles are less expensive upfront, making them a budget-friendly option for many homeowners. They are also easier and quicker to install, which can reduce labor costs.

Energy Efficiency and Environmental Impact

  • Metal Roofs: Metal roofs reflect solar radiant heat, which can reduce cooling costs by 10-25%. They are also environmentally friendly, as many metal roofing materials are made from recycled content and can be recycled again at the end of their life.
  • Shingle Roofs: Traditional asphalt shingles absorb more heat, which can increase cooling costs. However, there are now "cool roof" asphalt shingles available that are designed to reflect more solar radiation than traditional shingles. Asphalt shingles are less eco-friendly, as they are a petroleum product and the recycling options are more limited compared to metal.

Aesthetic and Design Options

  • Metal Roofs: Metal roofing offers a wide range of styles, colors, and finishes, including options that mimic the look of shingles, tile, or wood shakes. This versatility can complement various architectural styles, from traditional to contemporary.
  • Shingle Roofs: Asphalt shingles come in a variety of colors and styles, including three-tab, architectural, and premium designer shingles. They can adapt well to different architectural styles, offering a traditional look that is particularly suited to residential homes.

Maintenance and Repair

  • Metal Roofs: Metal roofs require minimal maintenance and are less prone to the growth of moss and algae. They are also easier to repair in the event of damage, although matching the color and finish of older panels can be challenging.
  • Shingle Roofs: Shingle roofs may require more maintenance, including regular inspections for damaged or missing shingles, especially after severe weather. Repairs are generally straightforward and less expensive than metal roof repairs.

Ultimately, the choice between metal and shingle roofs depends on a homeowner's priorities, including considerations of cost, durability, energy efficiency, aesthetic preferences, and maintenance requirements. Metal roofs offer a long-lasting, durable, and eco-friendly option with higher upfront costs, while shingle roofs provide a cost-effective solution with a traditional appearance and easier installation.

 

In Conclusion


While the idea of installing a metal roof over existing shingles might appear attractive for its simplicity and cost-effectiveness, it's important to consider the potential downsides and long-term implications – especially if your current shingle roof needs repairs.


Through thorough evaluation and professional advice, homeowners can make an informed decision that balances immediate benefits with the durability and performance of their roofing investment.


If you're looking for a reputable roofing company, use JG Wentworth to compare quotes from reputable service providers!


The information is provided for educational and informational purposes only. Such information or materials do not constitute and are not intended to provide legal, accounting, or tax advice and should not be relied on in that respect. We suggest that You consult an attorney, accountant, and/or financial advisor to answer any financial or legal questions.

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