When planning a roofing upgrade, many homeowners are drawn to the durability and sleek appearance of metal roofs. During this transition, the question of whether you can install a metal roof over your shingles comes up. This is a popular consideration as it could save time and reduce costs.
In this blog post, we’ll explore the feasibility of this approach, along with its pros, cons, and important points to help you make an informed decision.
What Is A Metal Roof Overlay?
A metal roof overlay, also known as installing a metal roof over shingles, is a technique where a new metal roof is added directly over the existing roof without removing the old materials. This roofing process makes installation simpler, preserves the original roofing structure, and provides a strong, weather-resistant layer. A common option for homeowners on a budget wishing to improve the appearance of their home and increase its resilience to harsh weather is a metal roof overlay.
Answering The Main Question: Can You Put A Metal Roof Over Shingles?
Yes, while this roofing method is not always recommended by professional roofers, you can install a new shingle roof over an existing shingle one if they’re in good condition. Usually, you can cover one layer of shingles with metal panels. However, if there are two or more layers of shingles, then this process is not possible.
Overall, installing a metal roof over shingles can save time and labor costs by avoiding a full roof tear-off. However, if the shingles are damaged, this process will make your roof more vulnerable to issues like leaks, as water can get underneath the metal. This is because basic roofing components like underlayment are not replaced, affecting the roof’s performance.
It’s best to consult a qualified contractor to assess the roof’s condition and ensure it meets building codes.
Also Read: Metal Roof vs. Asphalt Shingles: Pros, Cons, and Cost Differences
What Are The Pros And Cons Of A Metal Roof Over Shingles?
Let’s break down the pros and cons so you can get a clearer picture of what it means to put a metal roof over shingles:
Pros Of Putting A Metal Roof Over Shingles
1. Cost Savings
By avoiding the labor and disposal costs associated with tearing off an old asphalt roof, you can save up to 25% on the total cost of the project.
2. Time Efficiency
The installation process is quicker without the need to remove shingles, reducing disruption to your household.
3. Environmental Benefits
This method helps reduce waste, as there’s no need to discard old shingles in landfills, making it an eco-friendly option.
Cons Of Putting A Metal Roof Over Shingles
1. Higher Initial Cost
While installing a metal roof over shingles can save on removal costs, the upfront cost of metal roofing materials is typically higher than asphalt shingles.
2. Potential for Expansion and Contraction
Metal roofs can expand and contract with temperature fluctuations, which may cause fastener issues if it’s not installed correctly.
3. Limited Installation Options
Some roofing contractors may lack experience installing metal roofs over shingles, leading to potential problems if the installation is not done by a qualified professional.
4. Aesthetic Compatibility
Depending on your home’s style, a metal roof may not blend well with traditional architectural designs, possibly affecting the overall look.
5. Insurance Considerations
Some insurance companies may have specific requirements or higher premiums for homes with metal roofs, especially if they are installed over existing shingles.
6. Condensation Issues
In humid climates, condensation may form between the metal roof and shingles if there is not enough ventilation, leading to potential moisture problems.
7. Weight Issues
Compared to asphalt shingles, metal roofs weigh more. Putting additional weight on a building that is currently under stress could cause issues down the road, particularly if the roof deck is damaged or old.
Situations Where Installing A Metal Roof Over Shingles Is Fine
Now, let’s understand when this method could work well:
1. Condition of Existing Shingles
As mentioned above, installing a metal roof over shingles is only possible if the existing shingles are in good shape, meaning they aren’t curled, cracked, or missing. If the shingles are damaged, it could indicate underlying issues that need to be addressed before moving forward.
2. Structural Integrity
Along with the shingles, the roof’s overall structure must be sound. This includes ensuring that the trusses and decking are intact and able to support the additional weight of a metal roof. A professional inspection can help assess this.
When Choosing Another Roofing Option Is Best
In some situations, installing a metal roof over shingles is not a good choice. Let’s look into the reasons why you should look for another roofing option at this time rather than a metal roof overlay:
1. Severe Damage to the Existing Roof
If the shingles are severely damaged, such as being extensively curled, missing, or layered multiple times, they should be removed before installing a new roof. This ensures a solid foundation and prevents further issues.
2. Structural Concerns
If the roof deck or trusses are structurally compromised, a complete tear-off may be necessary to address these underlying problems. This helps prevent damage to the new roofing system and ensures long-term stability.
3. Local Building Codes
Some local codes may limit the number of layers that can be applied over existing shingles. If the number is exceeded, a complete or partial tear-off will be required to comply with these regulations.
4. Ventilation Issues
Installing a metal roof over shingles can cause ventilation problems, potentially leading to moisture buildup. If proper ventilation cannot be achieved, removing the old shingles may be needed to avoid long-term damage.
5. Desired Aesthetic Changes
If homeowners want to change the look of their roof, removing the old shingles allows for new materials to be installed that better align with their design preferences.
6. Long-Term Cost Efficiency
While installing metal over shingles saves money initially, removing the old roof could improve the long-term performance of your new roof and reduce maintenance costs, making it a more economical choice in the future.
7. Material Compatibility
Certain roofing materials may not perform well when installed over existing shingles. If compatibility is a concern, it’s best to remove the old roofing material to ensure proper installation and longevity.
Trust All Around Roofing, Siding & Gutters For Your Metal And Shingle Roofing Needs!
A metal roof overlay can be a great investment for the right home, but that doesn’t mean it’s the right choice for every situation. The key is to have a professional assessment, careful planning, and a clear understanding of your home’s structure and local conditions.
All Around Roofing, Siding & Gutters is your go-to partner for all roofing services. With our quality shingle roofing services, we specialize in expert installation and repair. Our skilled team also uses top-quality materials and the latest techniques to deliver durable, weather-resistant metal roofing services. Whether it’s a full replacement or small repairs, we’ve got you covered. Reach out today at (937) 902-2839.
