Some may wonder if you can put metal roofing over asphalt shingles. And guess what? That is not recommended at all.

You can install them, but unluckily, you will experience problems if you install metal roofs over shingles. Some problems might cost you a lot of money in the long run.

Let’s get things underway and continue reading to discover the problems, benefits, and installation of metal roofs over existing shingles.

Is A Metal Roof Harder To Install Than Shingles?

Installing a metal roof can be more complex than installing shingles. It requires specialized knowledge, tools, and precision, especially when considering additional elements like gutters for metal roofs

While shingle installation is more common, straightforward, and easily repaired.

Can You Install a Metal Roof Over the Shingles?

You can definitely install a metal roof over existing shingles. This method, known as re-roofing or roof-over, allows you to save time and money by not having to remove the existing shingles.

However, it’s important to consult with a roofing professional. 

They will ensure that the conditions of the shingles are suitable for proper installation. 

You can install a metal roof over the shingles, but there are certain things you must remember. It does provide benefits, but you may need some help.

Putting a metal roof over shingles can provide an extra layer of protection for your home. The metal roof is a barrier, preventing water from seeping through the shingles.

However, this could make the roof too heavy. Also, if there is a leak, it is hard to tell if it is in the first or second layer.

Metal roofing can often be installed directly over shingles, like asphalt or wood shakes, but only sometimes. Some types require a flat deck. Consult a roofing professional for proper installation.

Problems with Installing a Metal Roof Over Shingle

1. You Can’t Replace Rotted Roof Decking

Do you know what exactly a roof deck is? It is a wooden board that supports the whole structure of your roof.

Inspection is necessary for the roof decking after 10 to 12 years to avoid any problems.

The contractors usually examine them by tearing the whole roof down to the decking during the replacement process, or they replace the roof deck first and then install roofs.

They won’t be able to replace it, leading to serious issues for the roofs and home structures ahead.

2. Increased Weight and Stress on the Roof Deck

Your home structure is a tough one!  

Asphalt shingles are lighter in weight than metal shingles. You won’t face any weight problems with asphalt shingles. 

However, you may experience rotten or damaged decks with metal roofs. Metal roofs are relatively lighter, but as a second layer, they put a weight on the shingles down to the deck. 

It’s also worth considering if metal roofs are noisy, a common concern among homeowners.

3. Roof Rot and Leaks

Call the contractor to make it right if you see any leaks and rots in your roofs.  

Installing a metal roof over shingles can make it difficult to detect and address existing roof leaks and rot. It can act as a barrier, hiding any underlying issues.


This will lead the water to leak and drip down the deck to the walls and ceiling. And to solve this leakage problem, you have to put your money on the table.

4. Reduced Lifespan

When you slap a metal roof over old shingles, think twice. Those shingles underneath? They might wear out and weaken your shiny new metal roof, leading to a shingle roof replacement sooner than expected. 

To keep your roof strong for years, check those old shingles first. Do it right, and your roof will look better. It will last longer, too! Remember, a solid start means a lasting finish.

5. Persistent Roof Issues

It can be frustrating when problems won’t go away, right?

Moisture can be a culprit, causing rot and damage over time. Putting a new roof on top won’t magically fix those underlying problems. 

To ensure a solid and long-lasting roof, addressing any existing issues with the old roof is crucial before installing the new one. 

Pros And Cons Of Metal Roof Over Shingles


  • Provides durability and longevity
  • It’s a money-saving process
  • They can resist harsh environments.
  • Less likely to catch debris
  • They are completely recyclable


  • Metal roofs can add weight to the shingles and the roof, damaging them for structural issues.
  • You cannot inspect the roof deck without replacing the whole metal roof.
  • You cannot find any leaks or rots on the deck with metal roofs over the shingles.

Benefits Of Metal Roof Over Shingles 

1. Longevity And Durability 

Opting for a metal roof over traditional shingles is a smart move for long-term benefits. Metal roofs are champions in endurance, often surviving their counterparts by decades.

 They can shield your home for over 50 years, particularly reducing the need for frequent repairs or replacements. This not only saves your time but also keeps your wallet happy.

2. Energy Efficiency 

The best part!

Metal roofing is way more energy efficient compared to asphalt shingles. With cool roof pigments and above-sheathing ventilation, metal roofs offer significant energy savings for homeowners.


These cool roof pigments are designed to reflect sunlight, which means the roof absorbs less energy. 

Also, metal roofs have high thermal emittance, allowing them to release heat effectively. 

This combination helps decrease the heat entering the roof system and the rest of the home, resulting in lower cooling energy costs. 

Studies have shown that a cool metal roof can reduce home cooling energy expenses by up to 15% to 20%!

On the flip side, asphalt shingles tend to absorb and trap heat, leading to increased utility consumption. 

3. Environmental Impact

Choosing metal roofing is a smart move for our planet. Unlike common asphalt shingles, metal roofs are entirely recyclable, making them a more eco-friendly choice.

What’s cool is that metal roofs don’t just end up in the trash; they can be recycled and used again, helping us cut down on waste and save our precious resources.

Here’s the fact

By picking metal over asphalt, we also reduce the need for new roofing materials. This means less energy is spent on making and moving these materials around. 

Metal Roof Over Shingles Problems FAQs

What is a roof over?

A roof-over is a process where a new roofing layer is installed directly over the existing one. It’s like giving your house a new hat without removing the old one!

How long does a metal roof over shingles last?

A metal roof installed over shingles can last 40-70 years. It’s a long-term investment, ensuring your home stays protected for decades.

How many layers of shingles can you put a metal roof over?

You can typically put a metal roof over up to two shingles layers. However, it’s essential to check local building codes and the condition of the existing shingles first.


Always consult with your building department before starting roofing projects. They will let you know about the precautions and measurements.

Properly installing your metal roofs allows you to enjoy benefits like durability and long lifespan and avoid losing money.

I hope I’ve got you covered! Let us know if you enjoy other benefits, and share your experience with the metal roofs over shingles.