Can You Install a Metal Roof Over Shingles? (Pros and Cons)

February 17, 2023

In recent years, metal roofs have become an increasingly popular option for homeowners due to their durability, energy efficiency, and the range of design options they offer. But what if you already have a shingle roof that’s still in good condition? Can you install a metal roof over shingles, or is it best to start from scratch?

You can install metal roofing over shingles as it acts as an extra layer of protection for your home. However, it can also be more expensive to install, and if not done properly, it can void the warranty on your shingles. As such, it is important to contact a reliable roofing contractor to reduce the risk of more cons than pros.

Read on to learn more about the pros and cons of installing a metal roof over shingles, so you can decide if it’s the right option for your home.

Pros of Installing a Metal Roof Over Shingles

When you install a metal roof over shingles, the main pro is money savings since you don’t have to pay for the tear-off of your existing roof. Additionally, the metal roof can protect you in areas where the shingles might fail, such as around the chimney or vent pipes. Here is a comprehensive analysis of the benefits of installing a metal roof over shingles:

Durability

By installing metal roofing over your asphalt roof, you can extend the life of your roof for years to come. The metal roofs are incredibly durable and can last up to 50 years or longer with proper maintenance. However, this lifespan is achievable when metal roofs are installed correctly and proper installation techniques do not involve placing a roof over an already-existing roof.

The additional roof can strengthen the structure and make it more resistant to harsh conditions such as extreme winds and hail. It can also protect your house from leaks and other water damage due to aging shingles.

Energy Efficiency

Installing a metal roof over your existing shingles can help to reflect the sun’s heat away from your house. Metal roofing is highly reflective and can deflect up to 60% of the sun’s heat away from your house.

Both roofing materials can ensure that your home is better insulated, keeping the heat in during the winter and reflecting it away during the summer. They can also minimize the use of heating and cooling systems, helping you save on your energy bills.

Design Options

Metal roofing is available in various colors, styles, and finishes, which can create the perfect look for your home. You can use the roof to bring in a new, modern look, or you can use it to create a classic design.

The metal roof can also be curved and shaped, giving your home additional architectural detail. You can also combine colors and materials for a unique and eye-catching look.

If you desire the same color as was in the shingles, you can paint the metal roof to match the asphalt roof. With the same color, you can maintain a cohesive look without replacing the old roof completely.

Added Value

Buyers are often interested in homes with newer, more energy-efficient roofs, and a metal roof can show potential buyers that you have taken care of the house. Installing a metal roof over existing asphalt shingles can add value to your home, increasing its energy efficiency and curb appeal. However, there will be much more value if the metal roof is installed correctly, with no shingles underneath it.

Eco-Friendly

Metal roofs can prevent an existing shingle roof from being thrown away and sent to landfills. It can help reduce waste and can be beneficial for the environment. The old materials can also be recycled when it’s time to replace the roof.

In addition, installing a metal roof over your existing shingles can help you create a more sustainable home and reduce your carbon footprint.

Cons of Installing a Metal Roof Over Shingles

While metal roofing installation has many benefits, it’s important to consider the potential drawbacks. For instance, installing a new metal roof can be more difficult and expensive, and it may also void the manufacturer’s warranty on the existing roofing material.

No experienced, professional roofing contractor would ever agree to install a new roof over an existing roof. If you meet a contractor who’s willing to do this job, run!

Here is an elaborate analysis of these cons:

Difficult Installation

Installing a metal roof over shingles can be more difficult as it needs extra design to set the roof over the other. It can also be more time-consuming than a traditional roof installation as more work is dedicated to the roof construction.

In addition, the extensive preparation of the shingle roof before a metal roof is installed can be difficult and time-consuming. The preparation includes removing existing water barriers, leveling the roof surface, and ensuring that all nails are properly set.

Increased Cost

The cost of installing a metal roof over shingles can be significantly more than a traditional roof installation. It is due to the additional labor and materials needed for the installation.

The cost of the metal roofing material itself can also be more expensive than traditional shingle roofing, further increasing the overall cost.

Warranty Issues

Installing a metal roof over shingles can void the manufacturer’s warranty on the existing roofing material. The shingle roof can no longer be covered in the event of any issues or damage to the existing asphalt shingles.

Therefore, it’s important to understand the warranty and any potential risks associated with installing a metal roof over shingles. You can ask a professional for guidance on any warranty issues.

Potential Weight Issues

Metal roofs are generally heavier than shingle roofs, and if the existing roof is not strong enough to hold the extra weight of two roofs, it can be a serious safety hazard. The weight of the metal roofing material can add additional stress to your home’s frame, resulting in structural damage or problems.

The frame may require additional reinforcement to support the additional weight, which can add to the overall cost of installing a metal roof over shingles.

Get a Professional Roof Installation Instead

Installing a metal roof over shingles is almost never recommended by professional roofers.

It is important to consider the potential drawbacks of a roof-over. For instance, the difficulty of installation, increased cost, and potential warranty issues. But if you choose a reliable, professional roofing contractor, such as Roof X, you can ensure that you get a new roof that’s properly installed— whether you go with asphalt shingles or metal!

Contact us today for a free estimate and to learn more about our best practices.