When it’s time to consider a metal roof over shingle roof, many homeowners are looking for a quick and durable solution. Here’s what you need to know right away:
- Durability: Metal roofs last typically 40-70 years, much longer than asphalt shingles.
- Energy Efficiency: They reflect solar radiant heat, potentially reducing cooling costs by up to 40%.
- Safety: Highly resistant to fire, mold, mildew, and insects.
- Weight: Lighter than tiles, reducing structural concerns.
- Insurance: Potential for reduced insurance premiums due to added protection from elements.
Switching to a metal roof over shingle roof is a popular choice for those seeking longevity and improved aesthetics for their home.
I’m Adam Kadziola, a trusted voice in the metal roofing industry. With my background at DML USA Metal Roofing and a personal passion for long-lasting home improvements, I’m here to guide you through the options and benefits of installing metal roof over shingle roof. Join me as we dig deeper into the process and considerations ahead.
Can You Install a Metal Roof Over Shingles?
Yes, you can install a metal roof over shingle roof, but there are specific conditions you need to meet. This option can save you money, but it’s not always the best choice for every home.
Installation Possibility
Installing a metal roof over existing shingles is possible if the shingles are near the end of their lifespan but still intact. They shouldn’t be lifted, cracked, blistering, or bumpy. This is crucial because any structural issues with the shingles can lead to problems with the new metal roof. Local building codes often play a role in this decision. Some areas allow it, while others may require a complete tear-off of the old shingles.
Conditions to Consider
Decking Inspection: One of the main challenges is that you can’t inspect the decking underneath the shingles. If the decking is compromised, the additional weight of the metal could lead to severe structural damage.
Building Codes: Always check with your local building department. Some jurisdictions allow metal roofing over one layer of shingles, while others are stricter. Compliance is key to ensuring safety and avoiding future issues.
Contractor Expertise: Hiring a knowledgeable contractor is essential. They should have experience with metal roof installations and understand how to work with existing shingle roofs. Proper installation is crucial for the longevity and effectiveness of your new roof.
Cost Savings
One of the main advantages of installing a metal roof over shingle roof is cost savings. By not tearing off the old shingles, you can save up to 25% in labor costs. This includes savings on underlayment installation and disposal fees for the old roofing materials.
However, while the initial cost might be lower, this approach may lead to higher expenses later if the underlying shingles cause issues. It’s a delicate balance between saving now and potentially spending more in the future.
In summary, while installing a metal roof over shingles can be a smart move for some, it’s not a universal solution. Careful consideration of the roof’s current condition and local regulations is crucial. Proceeding with a qualified contractor can help ensure that your new metal roof provides lasting protection and value.
4 Things to Know Before Installing a Metal Roof Over Shingles
Before you decide to install a metal roof over shingle roof, there are several important factors to consider. These considerations can affect the longevity and performance of your new roof.
1. Decking Inspection
Before any installation, it’s crucial to inspect the decking beneath your shingles. Unfortunately, if you choose to install a metal roof over existing shingles, this step is often skipped. This can be risky because unseen damage to the decking can lead to structural issues.
Why It Matters: If the decking is weak or damaged, the added weight of a metal roof could cause sagging or even collapse.
What to Do: If possible, remove a few shingles in key areas to inspect the decking. Look for signs of water damage or rot.
2. Roof Lifespan
The lifespan of your current shingle roof plays a significant role in the success of a roof-over.
Current Condition: Make sure your existing shingles are not warped, cupped, or split. If they are, it’s better to replace them before adding a metal roof.
Future Considerations: A metal roof can last 40-70 years, but its longevity can be compromised if installed over deteriorating shingles.
3. Leak Challenges
Leaks are harder to detect and fix when you install a metal roof over existing shingles.
Leak Pathways: Water can seep under the metal panels and travel along the old shingle roof, making it difficult to find the source of a leak.
Repair Costs: Fixing leaks can be costly and time-consuming, especially if the source is hard to locate.
4. Material Replacement
When you skip the tear-off process, you miss the chance to replace crucial roofing materials.
Underlayment: The underlayment from the old shingle roof may not be suitable for a metal roof. This layer is vital for preventing moisture from reaching the decking.
Structural Integrity: Ensure that the roof structure can handle the combined weight of both the old shingles and the new metal roof.
In conclusion, while installing a metal roof over shingles can save money initially, it’s important to weigh the potential long-term risks. A thorough inspection and understanding of the current roof’s condition are essential steps to ensure a successful installation.
Metal Roof Over Shingle Roof: Installation Methods
When considering a metal roof over shingle roof installation, understanding the various methods is crucial. Let’s look at the primary installation techniques: using underlayment, purlins, and the benefits of creating an air gap.
Underlayment
What It Is: Underlayment is a protective layer placed between the old shingle roof and the new metal roof.
Why You Need It: This layer acts as a second defense against water infiltration. It is essential because if water sneaks under the metal roof, the underlayment will help prevent it from reaching the decking and causing damage.
Benefits:
Moisture Barrier: Keeps moisture away from the roof deck, reducing the risk of rot and mold.
Buffer: Provides a smooth surface for the metal panels, minimizing wear from the rough shingle texture underneath.
Purlins
What They Are: Purlins are horizontal bars or strips that provide a flat surface for metal panel installation.
Installation Process: These are attached directly to the roof deck over the existing shingles.
Benefits:
Flat Surface: Purlins create a uniform, flat surface, which is ideal for metal panel attachment. This helps avoid the irregularities that shingles can introduce.
Structural Support: By attaching metal panels to purlins, the roofing system becomes sturdier, as the metal is fastened to both the purlins and the underlying plywood.
Air Gap Benefits
Purpose: An air gap is the space created between the metal roof and the old shingle roof, often achieved by using purlins.
Advantages:
Thermal Barrier: The air gap acts as insulation, reducing heat transfer into the home. This can significantly lower cooling costs in the summer.
Improved Ventilation: The gap allows air to circulate, which can help with moisture evaporation and prevent condensation issues.
Energy Efficiency: With a radiant barrier, the air gap can further improve energy savings by reflecting heat away from the building.
Understanding these installation methods helps you make informed decisions about how to best install a metal roof over shingle roof. Each method offers distinct advantages that can improve the durability and efficiency of your new roof.
Factors Influencing a Roof-Over Decision
When planning to install a metal roof over shingle roof, several key factors come into play. These include building codes, roof condition, and the expertise of your contractor. Let’s explore each of these to help you make an informed decision.
Building Codes
Why They Matter: Local building codes dictate what you can and cannot do when it comes to roofing projects. Some areas allow metal roofing over asphalt shingles, while others don’t.
What to Do: Always check with your local building department before starting any roofing project. They will inform you of the specific regulations and restrictions in your area. This is crucial to ensure your project is compliant and avoids any legal issues.
Roof Condition
Importance: The current condition of your shingle roof is a major factor in deciding whether a roof-over is feasible.
What to Look For: The shingles should be in good shape—no warping, cupping, or missing pieces. If your roof has multiple layers of shingles, some codes may restrict adding more due to weight concerns.
Action Step: Have a professional inspect your roof to assess its condition. This helps determine if a roof-over is a viable option or if repairs are needed first.
Contractor Expertise
Why It Matters: The skills and experience of your contractor play a critical role in the success of your roof-over project.
What to Consider: Choose a contractor with a strong background in metal roofing installations. They should be familiar with local building codes and have experience dealing with the unique challenges of installing metal over shingles.
Finding the Right Contractor: Look for contractors who are recommended by reputable sources or who have certifications from recognized roofing organizations. You can also reach out to DML USA Metal Roofing for guidance on finding qualified professionals in your area.
By understanding these factors—building codes, roof condition, and contractor expertise—you’ll be better equipped to make a well-informed decision about installing a metal roof over shingle roof. This will ensure your project is not only compliant but also durable and efficient.
Frequently Asked Questions about Metal Roof Over Shingle Roof
Is it okay to put a metal roof over existing shingles?
Yes, you can install a metal roof over shingle roof. This option is popular due to its cost-effectiveness and efficiency. However, certain conditions must be met. First, the existing shingles should be in good shape—no warping, cupping, or missing pieces. If the shingles are compromised, it could affect the lifespan of the new metal roof.
Local building codes also play a significant role. Some areas allow this installation method, while others don’t. Always check with your local building department to ensure compliance.
Do I need underlayment for metal roof over shingles?
Yes, underlayment is crucial when installing a metal roof over shingles. It acts as an extra layer of protection against moisture, preventing leaks and water damage. This is especially important because shingles can sometimes trap moisture, leading to potential problems.
Underlayment also provides a smooth surface for the metal panels, ensuring a better fit and finish. It can help in noise reduction, making your home quieter during rainstorms.
How much more expensive is a metal roof over shingles?
The cost of installing a metal roof over shingle roof can vary based on several factors. While metal roofs are generally more expensive than asphalt shingles, they offer long-term savings. Metal roofs have a longer lifespan, often lasting 40 to 70 years, compared to the 20 to 30 years for traditional shingles.
Moreover, metal roofs are energy-efficient, reflecting heat and potentially reducing cooling costs by up to 40% during the summer. Some insurance companies also offer discounts for metal roofs due to their durability and fire resistance.
In terms of initial costs, installing metal over existing shingles can be cheaper than a full roof replacement. This is because it saves on labor costs associated with tearing off the old shingles. However, always weigh these potential savings against the need for compliance with local building codes and the condition of the existing roof.
Conclusion
Choosing the right roofing solution is a big decision, and we’re here to help make it easier. At DML USA Metal Roofing, we understand the importance of durability, safety, and cost-effectiveness when it comes to your home. Our metal roof over shingle roof option offers a practical solution for homeowners looking to upgrade without the hassle of a full roof replacement.
Why Choose DML USA Metal Roofing?
Longevity and Durability: Our metal roofs can last 40 to 70 years, offering peace of mind and long-term protection. They are resistant to extreme weather conditions, including high winds, hail, and even fire.
Energy Efficiency: Metal roofs reflect sunlight, reducing cooling costs by up to 40% during hot months. This not only saves money but also reduces your carbon footprint.
Cost Savings: By installing a metal roof over existing shingles, you can save on labor costs associated with removing old materials. Plus, many insurance companies offer premium discounts for homes with metal roofs due to their improved safety features.
Eco-Friendly: A roof-over method produces less waste, aligning with environmentally-conscious goals.
Making the Right Decision
Before proceeding, ensure your existing shingles are in good condition and check local building codes. Our team can guide you through these steps to ensure a smooth installation process. We also recommend consulting with a professional contractor to assess your roof’s condition and discuss the best options for your home.
Final Thoughts
Opting for a metal roof over shingle roof is not just about aesthetics or trend—it’s a choice for durability, efficiency, and long-term savings. DML USA Metal Roofing is committed to providing high-quality, maintenance-free roofing solutions that stand the test of time.
Ready to make the switch? Explore our products and see how we can transform your home with our expert solutions.