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5 Problems With A Metal Roof Over Shingles: Problems You Shouldn’t Ignore

Posted on August 12, 2023

Estimated Reading Time : 5 Min.

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metal roof over shingles

Many homeowners choose to save money by installing a metal roof over shingles. But the question is, does it really save money?

Making informed decisions isn’t just about the immediate benefits. It’s crucial to think about your long-term future. Ask yourself if your roofing choice will lead to a roof that will last you years to come. This blog post is designed to help guide you in making decisions that benefit you and your home in the long run. 

The Temptation To Install A Metal Roof Over Shingles

Let’s first explore the reason why many homeowners are tempted to consider installing metal roofs over their existing shingles. It’s a choice that, at first glance, seems like an attractive shortcut to a better roof. 

Here are some reasons why they make that choice:

1. Saving Time

A roof replacement can be a disruptive and time-consuming process. Installing metal over shingles may be a way to speed things up, as it can reduce the installation timeline by removing the need to tear down the old roof.

2. Environmental Concerns

Some homeowners are environmentally conscious and believe preserving existing shingles is an eco-friendly choice. They see it as a way to reduce waste by not tearing off and disposing of old shingles.

3. Potential Savings

At first glance, the savings associated with not removing shingles might make this an appealing option. However, it’s crucial to dig deeper into the economics of this decision. While you may save by not paying for removal costs, there are potential hidden expenses down the road.

Metal roofs are a long-term investment. You might compromise their performance and lifespan by installing one over old shingles. This means you could face the need to repair or replace the roof sooner than if you had done a proper installation from the start. The money saved initially could pale in comparison to the long-term costs of maintenance and repairs.

So, while the temptation to save money and time is understandable, it’s essential to consider the long-term financial implications, and your home’s structural integrity when you’re deciding between installing a metal roof over shingles or opting for a complete re-roofing project.

You should have one roofing system at a time for better results and efficiency. It will help you in the long run, and prevent you from experiencing more problems. If you decide you want to stick to asphalt shingles, read our blog post on which asphalt shingles are right for you.

Problems With Installing A Metal Roof Over Shingles 

Though you may be considering the above factors as good enough reasons to install a metal roof over your shingle one, here are five problems you may experience if you choose to do so:

Problem #1: Inadequate Insulation And Ventilation

One common issue with having a metal roof installed over shingles is the imbalanced levels of insulation and ventilation. Without proper insulation, your home may become susceptible to temperature fluctuations, leading to discomfort and high energy bills. Inadequate ventilation can exacerbate this problem by trapping heat and moisture, potentially causing damage to the underlying structure.

Problem #2: Increased Risk Of Condensation

Condensation can pose a significant threat to the integrity of both your roof and your home’s interior. Metal roofs conduct heat and cold more effectively than traditional shingles, which can result in condensation forming on the underside of the metal panels. This moisture accumulation can lead to rust, mold growth, and even structural damage over time.

Problem #3: Trapped Moisture And Leaks

When metal roofing is installed over shingles, moisture from rain or snow can become trapped between the layers. This trapped moisture can seep into the underlying shingles, causing them to deteriorate prematurely. Additionally, if not properly sealed, the seams between metal panels can become vulnerable entry points for leaks.

Problem #4: Accelerated Corrosion

While metal roofs are known for their durability, the presence of trapped moisture or exposure to certain environmental conditions can accelerate corrosion. Rust compromises the structural integrity of the roof and diminishes its appearance. Regular inspections and appropriate protective coatings are essential to combat this problem.

Problem #5: Unsupported Weight And Structural Stress

Shingles are a relatively lightweight roofing option, but the weight of the roof increases significantly when you add metal panels on top. Some structures may not be designed to handle this extra weight, leading to sagging or even collapse in extreme cases. It’s crucial to assess your home’s structural capacity before opting for a metal roof over shingles.

Metal roof over shingles 

Signs To Watch Out For

Now that you know the set of problems that occur when installing a metal roof over shingles, you should know how to deal with them. To ensure the long-term health of your metal roof over shingles, keep an eye out for warning signs. These include visible rust, sagging sections, interior leaks, and unexplained increases in energy bills. Timely detection can help you address issues before they escalate into more expensive repairs.

1. Regular Maintenance For Longevity

Proper maintenance is key to extending the life of your metal roof. Clear debris regularly, inspect for damage, and address any issues promptly. Ensure the roof’s drainage system is functioning correctly to prevent water from pooling and causing damage.

2. Consulting With Professionals

Consulting with roofing professionals is a wise choice when considering a metal roof over shingles. An experienced roofer can assess your home’s structural suitability, recommend insulation and ventilation improvements, and ensure proper installation techniques to avoid potential problems.

3. Prevention Is Key

Preventing problems with a metal roof over shingles starts with informed decision-making. Conduct thorough research, consult some experts, and prioritize insulation and ventilation enhancements. By taking these precautions, you can enjoy the benefits of your new roof without compromising your home’s safety and comfort.


In conclusion, while having a metal roof over shingles may seem to offer exceptional benefits, it’s crucial to be mindful of potential problems. By staying vigilant, investing in proper installation and maintenance, and seeking expert advice, you can make the most of your metal roofing experience. Your home deserves a strong and reliable roof that stands the test of time.

Do You Want To Install A Metal Roof On Your Home Or Office?

If you are considering installing a metal roof over shingles, removing the old shingle roof first is best. We don’t recommend homeowners install a metal roof over shingles for the above-mentioned reasons. If you are a firm believer in the efficiency of a metal roof, consider installing one over a plain roof deck. At A. Fricker Roofing and Waterproofing, we’re home to expert, dedicated, and skilled metal roofing professionals who you can trust and rely on. Contact us today at (918)-402-7167, and consult roofing professionals about your metal roofing project.

A. Act quickly. Identify the source of the leak, if possible, and contact a roofing professional to address the issue before it worsens.

A. Your roofer can recommend suitable coatings based on the type of metal your roof is made out of, and local climate conditions.

A. Reverting to shingles after installing a metal roof can be complex. It’s best to consult with professionals to explore your options.

metal roof over shingles