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Installing a Metal Roof Over Asphalt Shingles

Understanding the Basics of Metal Roof Installation Over Asphalt

When considering a roofing upgrade, homeowners often contemplate whether installing a metal roof over existing asphalt shingles is a viable option. This method not only offers a streamlined approach to roof renovation but also brings several benefits and considerations that are crucial for an informed decision.

Evaluating Structural Integrity and Local Codes

Before proceeding with a metal roof installation, it's imperative to assess the structural capacity of your home. The additional weight of a metal roof, although generally lightweight, requires a thorough evaluation of your home's ability to support it. Concurrently, adhering to local building codes is essential. These regulations may vary, dictating whether you can overlay a metal roof on existing shingles or if removal is necessary.

The Role of Existing Shingle Condition

The current state of your asphalt shingles plays a significant role in this process. If the existing shingles are in poor condition, they could undermine the stability and effectiveness of the new metal roof. Therefore, a careful examination is necessary to ensure a successful overlay.

Importance of Moisture Management

One of the critical aspects of installing a metal roof over asphalt shingles is effective moisture control. The presence of a reliable moisture barrier is essential to prevent water entrapment, which can lead to mold, rot, and compromised roof integrity. Proper ventilation is also crucial to avoid condensation issues.

Financial Considerations: Cost-Benefit Analysis

While installing a metal roof over asphalt shingles can be cost-effective by eliminating the need for shingle removal, it's important to consider the long-term financial implications. Metal roofs, known for their durability and energy efficiency, can offer significant savings over time, despite the initial investment being higher than traditional roofing materials.

Advantages of Metal Roofs Over Asphalt Shingles

Enhanced Durability and Longevity

Metal roofs are renowned for their exceptional durability and extended lifespan. Typically lasting 40 to 70 years, they far surpass the life expectancy of asphalt shingles. Their resilience against harsh weather conditions like hail and high winds translates into fewer repairs and a longer-lasting roof.

Energy Efficiency and Environmental Benefits

Metal roofs reflect solar heat, contributing to reduced cooling costs and enhanced energy efficiency. This attribute not only benefits the homeowner but also aligns with environmental sustainability by minimizing energy consumption.

Acoustic Advantages: Noise Reduction

Contrary to popular belief, metal roofs can offer superior noise insulation compared to asphalt shingles. When installed over existing shingles, the additional layer acts as a sound barrier, further dampening external noise and creating a quieter indoor environment.

Addressing the Challenges: Disadvantages and Risks

Potential Moisture Issues and Installation Concerns

The risk of moisture entrapment between the metal and asphalt layers is a significant concern. Proper installation techniques and the use of appropriate moisture barriers are crucial to mitigate this risk. Failure to address these issues can lead to structural damage and decreased energy efficiency.

Initial Investment and Long-Term Savings

The upfront cost of metal roofing materials and specialized installation can be higher than traditional options. However, the long-term benefits, including reduced maintenance costs and energy savings, often justify the initial expenditure.

Professional Consultation: Ensuring a Successful Installation

The Importance of Expert Assessment and Installation

For a project of this magnitude, consulting with roofing professionals like Empire Roofing and Exteriors, located in Morehead KY, is crucial. Their expertise in assessing the condition of existing shingles, understanding local building codes, and providing accurate cost estimates ensures a well-informed decision-making process.

Material Selection and Final Inspection

Choosing the right type of metal roofing material is vital for both aesthetic and functional purposes. Professional installers can guide homeowners in selecting materials that meet their specific needs and budget. Additionally, a final inspection by experts guarantees that the installation adheres to the highest standards of quality and safety.


Opting to install a metal roof over existing asphalt shingles presents a strategic approach to roofing upgrades. Balancing the initial costs with long-term benefits, such as durability, energy efficiency, and noise reduction, is key. Professional guidance and meticulous installation are paramount to the success of this endeavor, ensuring a wise investment in your home's future.

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