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Can You Put A Metal Roof Directly Over Shingles

Cost To Install A Metal Roof

Can You Put a Metal Roof Over a Shingle Roof?

Metal roof installation is a labor intensive task, requiring a competent, skilled roofer with a great deal of experience to manage this type of installation project. When youre using a more expensive material, the cost to install a metal roof can be on the higher end of the scale. However, the benefits that come with a metal roof are worth the investment.

Can You Put A Metal Roof Over Shingles

Yes, its possible to put metal roofing over shingles. Before you get started on your project, though, you will need to check with your local building department to see if theyll allow you to. Some areas will only allow re-roofing over one layer of shingles while others will allow over two layers. There are also some disadvantages to installing metal roofing over shingles that youll want to know about before starting. Contact your local roofing company to learn more and see what they can do for you.

Are There Advantages To Installing A Metal Roof Over Shingles

Its not just convenience or expediency, though these things do matter. Installing a metal roof over shingles takes far less time than trying to remove the shingles first. But there are other advantages, such as reducing sounds, improving insulation, and increasing water resistance. Installing a metal roof over shingles can save you money because the original shingles dont need to be removed.

by Mountaintop Metal Roofing | Jun 30, 2020 | Residential

Metal roofing can be seen almost anywhere. Covering bus stops in the city, covering barns in the countryside, or covering undercover play areas. Metal roofs are often used in these cases because of their longevity, easy maintenance, and simple aesthetic.

During the last two decades, however, metal roofing has been growing in popularity for residential homes. The industrial-looking corrugated roof or simple standing seam metal roofing has been replaced by metal roofing systems made to look like slate, cedar shingles, and more. While its gaining in popularity, finding an experienced professional to install this type of roof can be a challenge.

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Comply With Local Building Codes

It’s a good idea to verify that installing metal over shingles is in accordance with the local building code by making calls to your local zoning and building departments. In rare cases, there may be ordinances that prevent this method or require special handling during install.

A standard regulation will be on the number of shingle layers. One layer is typically okay, but there are some states with restrictions on two or more layers. This rule is due to the weight limit of house trusses, which varies by home. When there are multiple layers of shingles, the trusses can have too much weight, putting the homeowners at risk of the tresses falling, damaging the roof.

Ridge Vents Are More Obvious

Cold Roof Design &  Installation on SIP

On most homes today, attic venting is provided by a continuous ridge vent that runs across the peak of the roof. On a shingled roof, this continuous ridge vent is a strip of shingle-like material that runs the entire length of the peak of the house, masking outflow holes on the sides of the ridge. You likely have seen this countless times, but probably never really noticed because the CRV usually lies very flat and blends in perfectly with the surrounding roof.

On many metal roofs, especially standing-seam roofs, the CRV is also metal, and it stands out further and is thus much more noticeable. These thick, prominent lines or ridges are inherent in metal roofs and add to their distinctive look.

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Considerations When Installing Standing Seam Metal Over Shingles

Installing a new metal roof over an existing shingle roof is a quick way to get a new roof on a building without the cost and hassle of a shingle tear-off, and it is pretty common in this industry. However, the practice can create some problems, especially if certain considerations arent taken into account. Today on the Metal Roofing Channel, Sheffield Metals Technical Director, Jeff Hock, is working with Thad to demonstrate some different types of metal over shingle assemblies, discuss issues that come up during the install, and offer solutions for when they happen. Sheffield Metals always recommends removing the existing shingles so you can properly inspect, repair, and level the roof deck before installing a brand new roof. However, if you decide to roof directly over shingles, these tips should help you get the most out of your project.

Metal Roofing Does Not Attract Lightning

You might think that a metal roof will attract lightning, but this is not borne out by facts or statistics. According to a technical bulletin from the Metal Construction Association, “Metal roofing does not in any way increase the risk of a lightning strike.” Not only that but also if metal roofing does happen to get struck by lightning, it is less combustible than conventional roofing materials such as wood shakes or shingles.

As the bulletin asserts, “Because metal roofing is both an electrical conductor and a noncombustible material, the risks associated with its use and behavior during a lightning event make it the most desirable construction available.”

The reason that metal roofs do not attract lighting is simple: lighting seeks a path to ground, which is why trees, telephone poles, and other such structures tend to attract lightning. Metal roofs are isolated structural components, with no direct path to ground inherent in their design. Hence, there is no scientific reason for lighting to strike a metal roof any more often than it strikes an asphalt shingle roof.

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Can I Install A Metal Roof Over Shingles

When it comes to replacing your roof, you may be considering a transition to metal instead of wood or asphalt shingles. After all, there are many benefits to metal roofs.

The biggest question people have about metal roofs is if you can install this roofing over the top of asphalt shingles. The short answer is yes. In most cases, it is possible to place metal roofs directly over shingles without removing the existing roof. However, there are some situations where it wouldn’t be possible.

Keep reading to learn all about installing a metal roof over shingles and the dos and don’ts of this roofing method, including metal roof over shingles problems you may experience during or after installation.

Can It Be Done

Considerations When Installing Standing Seam Metal Over Shingles

In almost every instance, you can lay down new metal roofing over the top of an existing shingle roof. Although it is very durable, metal roofing is light while asphalt shingles can weigh up to four pounds per square foot, metal roofing can weigh just one pound per square foot. Adding metal roofing over shingles wont significantly add to the overall load, so theres generally no reason to remove the existing shingles in most cases.

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Can Metal Roofs Be Installed Over Shingles

In simplest terms: Yes, you can install a metal roof over shingles. However, youll want to check with your local building department before you make any decisions. Building officials in some areas will only allow a re-roof over one layer of shingles, while officials in other places may allow you to place the roof over two layers of shingles. Fortunately, in most areas, it wont be an issue if youre only going over one layer.

Not a real zip code.

Section 1511.3.1 of the 2018 International Building Code 1st Edition states, The installation of a new roof covering over an existing roof covering shall be permitted where any of the following conditions occur2. Complete and separate roofing systems, such as standing-seam metal roof panel systems, that are designed to transmit the roof loads directly to the buildings structural system and that do not rely on existing roofs and roof coverings for support, shall not require the removal of existing roof coverings.

So, its possible to have the installation of metal roofing over shingles, which is great news! But you might be wondering what the advantages and disadvantages are and what to keep in mind during installation. Keep reading to find out.

Building Codes For Metal Roof Panels Over Shingles

Determining the condition of your roof decking is not the only precaution to take before installing a metal roof over shingles. In any sort of construction, you want to ensure everything you do is code compliant. Check the building codes in your area to see if installing a metal roof over shingles is possible. Some building codes limit the number of roof layers that can be applied to a home. You may be required by code to peel off your shingles. If not, there should not be a reason you cannot install your metal roof over the previous one! Would you put Metal Roof Panels over shingles if you could?

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Contact Legacy Service To Schedule An Appointment

At Legacy Service, we love just about everything about this type of roofing. When they are installed correctly using the right materials, they can withstand just about anything. And since it reflects heat from the sun, it can help you save significantly on energy costs. Its also 100% recyclable, making it eco-friendly. We have decades of experience when it comes to installing this type of roofing, and we can actually custom-make every panel for your project. We also offer a lifetime warranty, which makes for a sound investment. If youd like to learn more about metal roof replacement, contact our Legacy Service team today to schedule an appointment.

Posted on Oct 19, 2019 in Roof

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A lot of elements play a role in maintaining the integrity of the roof, but as a homeowner, the most important components to pay attention to are the underlayment, ventilation, and material.

Can I Put Metal Roofing Over Osb

Summerside Steel Shingles

No, you do not need to screw into solid lumber . As you can see, the thinnest material they recommend is 1/2 OSB board at 9 on center up to 24 on center. Be sure to follow their instructions in order to obtain the warranty. Metal roofing screws need to go into framing.

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Ensure Your Shingle Roof Is In Good Shape

Almost every building department will comply with this installation process but may have a few caveats in terms of safety. Generally, they will check to ensure that the plywood of the existing shingle roof is in good shape and does not contain any soft spots.

This isnt just to make your life harder. A metal roof is installed with screws that need something to hold onto. Soft or unreliable plywood wont be able to hold the screws and thus your roof could come off during one of Northern Floridas famous afternoon thunderstorms. Lets not even get started on hurricane season.

Metal Roofing Is Impervious To Fire Rot And Insect Damage

One of the principal reasons metal roofing has exploded in popularity is that it is virtually fireproof. With the dangers of wildfire on the rise, metal roofing has become the roofing material of choice in many parts of the country. And not only that:

  • Insects such as termites can never eat metal roofing.
  • Metal roofing is impervious to rot and mildew.
  • Since it conducts heat quickly from the sun, snow slides off more quickly than with conventional roofing.

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Can You Put Steel Roofing Over Asphalt

Can you avoid tearing off your old asphalt shingle roof by putting a steel roof over it? Maybe. Most codes now allow no more than two layers of roofing before requiring a complete tear-off. So, if your roof has two layers, it may require a complete tear-off, even though steel is lighter than asphalt. Codes vary, so call your local building department to know how to install metal roofing over shingles properly, code-wise.

Do You Need Underlayment For Metal Roofing Over Shingles

Metal Roof Install Over Shingles

Underlayment is not required when installing metal roofing over shingles but is a definite plus. This extra layer ensures the previous shingles are not under continued stress which could lead to an increased risk of roof damage. While a metal roof is extremely durable compared to shingles, it is better to be safe than sorry.

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Roof Leaks Will Be More Difficult To Detect In The Future

When you cover the asphalt roof with a metal roof, you are merely masking the problem. Water will run down and across your old asphalt shingle roof.

The water will continue to flow until it reaches the source of the problem and begins to leak into your home. These leaks will be difficult to monitor and locate because they originate from two separate regions of two different roofs.

Do I Need Underlayment For Metal Roof Over Shingles

A metal roof over shingles may need to be adhered to the shingles. Installing metal roofing over shingles without laying them down is a plus, but laying them down is also a plus. It is this extra layer that prevents the previous shingles from becoming stressed, increasing the likelihood of roof damage.

With metal roof underlayment, an additional layer of protection from the elements is provided by a water-resistant barrier. Underlayment acts as a heat conductor for a metal roof, decreasing heat gain during hot weather and cold winter months. It not only blocks some of the noise caused by rain and other elements hitting the roof, but it also prevents sound from entering the house. Underlayment is required by some building codes for metal roofs. The lay-over of roofing material underlayment makes it easier to lay roofing material over the bare surface of your roof, giving it a uniform appearance. If a blowoff or water penetration occurs through the roof covering or flashings, an underlayer protects the inside of the home from direct sunlight. Choosing the right underlayment for your roof can be difficult.

Underlayment is one of the most important components of metal roofing systems. The water damage protection system has a significant impact on its longevity and provides additional safeguards against water intrusion. You can select from a number of different underlayment options.

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Hire A Roof Inspector First

Its crucial to have your roof inspected by a professional before you consider installing metal roof over shingles. Unless you purchased your home, you might not know whether or not there are already multiple layers of existing shingles.

A roofer will be much better at spotting the signs of leaking shingles, rot, or structural damage. If your current roof is in bad shape, its better to tear it away and start new. Theyll also be more familiar with local code requirements that may prevent you from installing a metal roofing system over your existing shingles. A roofing contractor will generally offer free estimates, and they will inspect your shingled roof in the process.

Even the handiest of homeowners shouldnt rely on their own skills to install a residential roofing system made from metal. If you install your metal roof over a leaky or buckling roof, it will lead to an expensive repair job. A professional can prevent you from making costly or dangerous mistakes.

Metal roofing is much more difficult to install than a variety of asphalt roof shingle styles. If you dont know how to cut metal roofing panels, you can warp them or damage the protective coating that prevents rust. You will also need to invest in some specialty tools to help you get the job done.

The Decking Of Your Roof

Can You Put Metal Roofing Directly On Shingles

Another thing to consider is the decking of your roof. The decking is the structure that supports the roofing material. Therefore, If you install a metal roof over an asphalt roof, you won’t be able to inspect the decking and, if your contractor is unable to test the integrity of your decking or examine for rotten boards, it may result in a costly problem down the line.

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Advantages Of Metal Roofing

In addition to potential cost benefits, metal roofing offers other advantages, including:

  • Long lifespans: A well-installed metal roof can last four to five decades without the need for replacement.
  • Durability: Metal roofs can withstand very intense weather events, including everything from ice storms and searing summer heat to pounding hail and gale-force winds.
  • Low maintenance: Properly installed metal roofs dont usually require routine maintenance or expensive repair jobs.
  • Reduced cooling bills: Because they have special coatings that allow them to reflect heat, metal roofs promote cooler interior temperatures so you dont have to use your AC system as much.

Why Should You Not Remove The Shingles

  • Leaving the shingles can result in a lower installation price, the contractor will not have to bill for the removal and disposal of the shingles.
  • It is eco-friendly. You will not be adding shingles to the overflowing landfills.
  • The shingles will act as an extra layer of protection. The shingles add another barrier between water and the decking.

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Metal Roof Panels Over Shinglescheck Your Roof Decking

To begin, a contractor will analyze the condition of your roof decking before installing a Metal Roof Panels system over shingles. We encourage customers to think about the current age of your roof. Remember, Metal Roof Panels systems will not need replacing for 40+ years. If your roof is already 15 years old, there may be some underlying damage to the decking. These previous issues to the decking will not allow the Metal Roof Panels system to last to its full potential. If the entire roof decking is in good conditionyou will not have to worry about taking off shingles. Parts of the roof decking can be replaced if needed. However, you will have to peel back the shingles in that spot to do so. If you want to follow through with this method of installation, a contractor will give your roof a professional inspection. From there, they will determine if it is possible.


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