Things You Must Know Before Installing Metal Roof Over Shingles

Metal Roof Over Shingles

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This brief yet comprehensive guide is designed for homeowners who plan to install metal roofs over the shingle roof. If you are one of them, jump right in to know everything that matters. It would help if you were not making costly mistakes when it comes to your house roof. It not only costs your money, but you will find yourself dealing with penalties.

Is It Possible To Install Metal Over Shingles?

Yes. It is possible to install metal over existing shingles without ripping it off but not in every state and city. You must check the local and state building codes to know if you can proceed with the project without landing yourself in a severe mess. 

Once you are done with permits, you have to assess your house roof to see if it can sustain the weight of the metal roof. Each roof is unique, and you can only determine your answer by checking the current condition and some other essential factors. It's best to get in touch with the best metal roof installation contractors to know the possibilities for your home.

Benefits Of Installing A Metal Roof

Installing a metal roof is a wise decision as long as it does not put your house at risk, more on that a little later. Here are some of the most sought-after benefits of metal roofing.


Residential applications of a metal roof are typical these days because of its incredible longevity. An average asphalt roof lasts for about 15-20 years with the best maintenance practices. In contrast, a metal roof can keep your house safe for more than 50 years, and that too with minimal maintenance.  

Curb Appeal Reasons

Metal roofs are available in a wide variety of colors and finishes. You can install a metal roof that mimics wood or cedar shakes. It all depends on the architectural style of your home and your personal preferences.

Durability And Resilience In Tough Weather Conditions

Be it snow or high-impact winds, adequately installed metal roofs can endure harsh weather conditions. They can withstand a wide range of temperature fluctuations and keeping away the excess water. Quick drainage and snowmelt off make a metal roof resilient.

It is no secret that water or high levels of moisture is the biggest threat to the structural integrity of your house roof. Managing the water woes is a lot more challenging when you are venting metal over existing shingles, so keep reading this guide on how to circumvent those issues.

Fire Resistance

The best metal roofs are resistant to fire. Although not all of the metals can withstand fire but make sure you are purchasing a material that is rendered safe in case of a fire event.

Environment Friendly

Most of the metal roofs are made up of recycled materials, making them environmentally friendly. Once the roof has completed its life span, it can still be recycled.

Cuts Down Energy Costs

As compared to every other roofing material available in the market, metal cuts down energy costs. Metal surfaces are reflective, so they do not absorb heat during summers keeping your house cool. Expect to pay fewer utility bills.

What Are The Risks/Challenges Of A Metal Roof?

Just like any other roofing material, there are risks and challenges to a metal roof.

  • The upfront cost of metal roof installation is higher as compared to asphalt shingles. So technically, you can replace the entire shingle roof for less money than adding metal over the existing roof.
  • One of the less talked about challenges is noise. You can install insulations to minimize the noise, but it adds more to the installation cost.

Benefits Of Installing Metal Roof Over Shingles

Well, what so great about installing metal over shingles that several homeowners go for it? Here are the two most important benefits.

  • When you install metal over shingles, there are no labor costs involved in ripping off the shingles. You can enjoy the benefits of a metal roof by spending a little less than a complete overhaul.
  • This is an excellent opportunity for those conscious of waste production and what's being dumped into the landfills. The shingles will not have to be transported and dumped into a landfill, reducing your carbon footprint.

Factors To Consider Before Venting Metal Roof Over Shingles


The most important thing is to check whether your roofing system can endure the additional weight of metal panels? Although metal is known to be one of the lightest roofing options, you should consult a professional to understand what works for your house. If you see buckling tresses of your existing roof, it signifies that the structure is already overburdened. Adding the weight of metal panels is not a good idea in such a situation.

Water Leakages

Inspect your roof for water leakages. Even a minor roof leak in the shingle layer of underlayment will be hard to be deal with once covered with metal. Fix the damages with either DIY or professional assistance before proceeding with the installation project.

Underlayment And Condensation

Metal roof over shingles condensation is one of the most serious issues faced by installers and homeowners. You can fight it off by choosing the right kind of underlayment. Know that the correct type of underlayment is not always a new one. 

The shingle layer(s) can also act as underlayment for the metal panels. The significant risk with such projects is that the shingles expand and contract, affecting the durability of metal. That is why it is highly recommended to find the most qualified roofers in your area and get your roof inspected.

Trapped water vapors beneath metal can lead to mold growth and rot. One of the most effective ways to minimize the risk of decay is to install furring strips and then install metal panels over them. The strips allow a gap between the two layers and allow the circulation of air. The ventilating air pocket is your defense against mold and rot.


The installation technique is crucial when it comes to venting metal over shingles. Screws and fasteners hold the metal panels firm. You must check the specifications provided by manufacturers, purchase the best product you can afford, and find an installation contractor who is experienced in handling such projects. In general, the fasteners should be applied in the flat of the steel instead of the ribs. The spacing between the fasteners should be maintained for safety and curb appeal reasons.

Roof Trimming

You may not have thought about roof trimming when it was all asphalt. But if you aim for cosmetic touches for your new metal roof, trim is an important consideration. All of the edges must be secured with top-quality flashing, protecting your roofing system against the snow. Adequately installed trim can crank up the curb appeal of your house.

If you are planning to sell your home shortly, a metal roof is a great investment. It pays off well because home buyers are looking for energy-efficient solutions.

Check Manufacturer's Specifications And Warranty

This is a must. Metal roofing products vary so it's critical to check the manufacturer's specifications. If you want to pitch the warranties, invest in the best products you can afford.

Now you know how to circumvent the common challenges faced by homeowners. One of the best approaches is to find a reliable roofing expert. Here are a few tips on how to verify whether a roofing professional is worth your money or not.

How To Find The Best Roofer In Your Area?

The professional competence of the installation contractor can make or break your metal over the shingle roof.

Verify The Claims Of Expertise

Any roofer will claim that they will offer you the best services. Not all of them are right. You have to identify the shady ones from the real experts. Do your research to find a qualified roofer. Are they licensed to handle metal roof installation? Do they have insurance coverage? Arrange a meeting with them to see if they can provide satisfactory answers to your questions.

Contact Previous Customers

Never hire a roofing professional before contacting any of their previous customers. You can request references from home improvement professionals or ask the contractor directly.

Read Reviews

Go online and check what others are saying about a particular roofing contractor you are considering. Check the positive and negative reviews to know what to expect. Check our local web roofing directory for unbiased reviews. 

Check Their Work

Request them to take you to a house they have worked for. The best ones back up their work and are confident in their expertise. Once you are satisfied with their quality of work, get everything written down in contracts.