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Can A Metal Roof Be Installed Over Asphalt Shingles

Preparing For A Roof Overlay

Reasons to Install a Metal Roof Over Asphalt Shingles

Before you install a metal roof over shingles, you need to prepare the roofing system for the roof overlay. First, you need to address any potential long-term issues, such as leaks or roof damage. If you dont take care of these problems early on, fixing them down the road will be more difficult since there are two layers of roofing.

Your roofing contractor should conduct a complete roof inspection. They should identify any issues that compromise the structural integrity of the roof. They may also have to renovate the structure or add framework to support the metal roof. Next, your contractor needs to look for roof damage or problems in previous workmanship. The current roof needs to be in like-new condition before you add the new layer of metal roofing.

Need a roof inspection, repair or replacement? Get a free estimate today!

Manufacturer Specifications And Warranty

Even with the best warranties, it may be hard to track someone down after 40 or 50 years so they can assess your roof and write you a check for any damage. Depreciation may also significantly reduce the amount youd receive. This is why its good advice to purchase the best product you can afford, follow the specifications of the manufacturer, and have it installed properly. Then, you can pitch the warranty after about five years.

Advantages Of Metal Roofs

Metal roofs offer many benefits, including:

  • Longevity. Metal roofs can last 40-70 years, depending on the material. Traditional asphalt roofing materials have an estimated life expectancy of roughly 12-20 years.
  • Durability. If installed correctly, some metal roofs can sustain wind gusts up to 140 miles per hour, will not corrode or crack and may be impact-resistant . In addition, metal roofs don’t need the periodic costly maintenance that other roofing materials often require. However, they should be inspected periodically to make sure no repairs are required.
  • Safety. Metal roofs will not spark and ignite into flames during a wildfire or lightning strike.
  • Energy efficiency. Metal roofs reflect the suns UV and infrared light rays that contribute to roof surface radiant heat, which can result in a 10-25% reduction in cooling costs.
  • Environmentally friendly. Metal roofs not only have 25-95% recycled content, depending on the material used, but are also 100% recyclable at the end of their life as a roof. In contrast, most shingle tear-off waste ends up as part of the building-related waste stream up to 20 billion pounds per year.

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Can I Install A Metal Roof Over My Old Shingles

Can I install a metal roof over my old shingles? Kreunen Construction of Olive Branch, MS answers these questions. Metal roofs provide a series of extraordinary benefits over asphalt shingles roofing. Some years ago, they were an innovation. Now, thanks to their durability and energy efficiency, they have become an extended roofing option across the US.

However, their installation costs make some homeowners think twice before deciding to install them. That is why many of them wonder: Can I install a metal roof over my old shingles?

Initially, the answer is yes. It is something possible. But, if you plan to make this switch, you should know how it is this process. Besides, consider some important implications that may turn this project into a bad idea.

Dont worry we are here to bring you the answers you need.

Question 4 Of : How Are The Metal Sheets Installed Over Shingles

Can You Install A Metal Roof Over Shingles
  • 1Nail or screw the underlayment and battens into the shingles. If the shingles are in decent shape, lay out the underlayment felt flat across the old roof.XResearch source Use a nail gun or nail and hammer to secure the felt to the plywood underneath the shingles.XResearch source Then, nail 2 by 2 in or 1 by 2 in boards in horizontal, parallel rows along the roof.XResearch source
  • If the shingles arent healthy, youll have to remove the shingles first.
  • The batten installation is really the only component of the process that makes it different from a standard metal roof installation.
  • 2Lay out metal panels and secure them to the battens. You may need a crew for this. Haul the metal sheets up to the roof screw them to the battens or subroof to secure them in place. These sheets are typically pretty large and unwieldy, so it may take some time to line the seams of each sheet up to make the room symmetrical.XResearch source
  • If the grooves on the metal panels arent flush when theyre laid side-by-side, youll need to cut them so that the seams match.
  • 3Install closure strips over the gaps and add the flashing. Once the metal sheeting is in place, cover each seam where two sheets meet with rubber or foam closure strips. These will keep water from penetrating your roof. Then, flash the roof by covering the edges of your roof with drip edge, and the apex of the roof with a ridge cap. Secure the flashing by screwing it into the edging and/or battens under the roof.XResearch source
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    How To Deal With Condensation

    Your new metal roof will gather condensation if there are air pockets directly under the metal.

    Condensation on your metal roof can be dealt with using a moisture barrier. This can take the form of new underlayment in many cases. Anything that prevents condensation from collecting on the metal roof.

    Luckily, if this occurs it wont leak into your house as you still have the shingle roof underneath. It should still be dealt with since it can reduce the life span of your metal roof.

    You Will Not Be Able To Repair Critical Roofing Materials

    When you get a metal roof-over, you avoid the tear-off process that comes with having a new roof. You will save money, but you will miss out on replacing critical materials that are included in a full roof replacement.

    Underlayment, for example, is one of these critical elements. It is the last line of defense for your roof system in keeping your decking dry. When you install a metal roof over an asphalt roof, you must rely on the underlayment from the existing roof. You will also not receive the right type of underlayment built exclusively for a metal roof.

    Roofing materials arent meant to last indefinitely. As a result, if youre going to invest in a metal roof, beginning from fresh with clean decking is suggested.

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    Is It Cheaper To Get A Metal Roof Or Shingles

    Youre probably wondering about the cost to install a metal roof over shingles. While its cheaper to purchase shingles , metal roofing may provide you with better value in the long-term. Not only do they look beautiful and unique, but theyre also designed to last decades longer because of their durability. In fact, a metal roof thats built properly will be able to handle anything Mother Nature throws at it. You will most likely never have to purchase another roof again in your lifetime.

    Can You Install A Metal Roof Over Asphalt Shingles

    Considerations When Installing Standing Seam Metal Over Shingles

    People have been installing metal roofs over layers of asphalt shingles for decades in fact, it used to be common practice and likely would have been considered wasteful in terms of time and energy not to do it. This practice is done less and less with asphalt on asphalt shingles, yet many people still find it acceptable to bury a shingle roof under a metal roof.

    There are pros and cons to most methods for home improvements, and roof-overlays are no exception. On the positive side, not tearing off the old asphalt shingle roof when installing metal roofing can save time and money. It can also arguably increase the R-value of the roof and act as an increased sound barrier. On the flip side, not tearing off the additional layers of the current roof increases the load of the roof, void or reduce manufacturer warranties, may impact the aesthetics of the new metal roof, and keep serious construction issues hidden.

    Here are the benefits and disadvantages of installing a metal roof over an asphalt shingles roof, along with things you might not have considered and, ultimately, whether you should do it or not.

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    Step : Get A Precise Measurement Of Your Roof Surface

    Getting an accurate measurement will help you determine the exact amount of material needed.

    With a metal shingle system, you are placing small panels in horizontal rows, so you can do a quick back-of-the-envelope calculation of how many panels you will need once you know the total roof surface area.

    You will need to measure and take into account valleys, dormers and chimneys on your roof. If you are installing a seam steel solution, you will also need to think in terms of each side of your roof.

    Tips For Installing A Metal Roof Over Shingles

    Metal roofs offer a ton of advantages. In sunny climates like San Diego, exposure to UV light can greatly reduce the lifespan of asphalt shingles. As compared to an asphalt roof, a metal roof is more resilient, and it is much better at absorbing the extra heat, which should help your house stay cool. Termites are much less inviting to rot, mildew, and infestations. They can also protect your home from spreading fires.

    Though they are more expensive initially, they have a much longer lifespan than a traditional shingle roof. Add that to their durability, and you wont have to spend nearly as much money on repairs. In many instances, a metal roofing system can last for the remainder of your homes life. So, how to go about installing a metal roof over shingles?

    Because they are so lightweight, metal roofing material can easily be installed over old shingles. This can greatly reduce the time, labor, and overall cost of installation, as well as provide better insulation for your home. Take a look at our analysis on how much is a metal roof and why its better than a shingled roof. It can also help dampen the noise of rain on your new metal roof.

    Theres no good way to dispose of existing asphalt shingles. Currently, they make up as much as 3% of landfill waste. Leaving them installed on your current roof is a good way to keep them out of landfills, and your new metal roof will protect them from deteriorating further.

    Read Also: How Often Do You Replace Shingle Roof

    What To Do Before Reroofing Over Existing Roof

    Before doing anything, hire an inspector to check your roof. The inspection identifies problems like leaks and damages. You also want to ensure they examine the rafters for signs of decay.

    Look for signs of other structural issues before adding more weight to your roof. Metal roofing material is lightweight. But added to an already buckling roof system, it will do more harm than good.

    Make the necessary repairs before adding new metal roof shingles on top of old shingles. I suggest getting curled and damaged shingles fixed as well.

    Otherwise, there may be many problems and an even more costly roof replacement in your future.

    Which Is Better A Metal Roof Or Asphalt Shingles

    How to install metal roofing over shingles (Yes, you can)

    Is an asphalt shingle roof or a metal roof right for you? An asphalt roof is going to be more cost-effective and you get great warranty options, but it has a shorter lifespan and needs more maintenance. A metal roof system is going to be more expensive, but lives longer and requires less maintenance.

    What are stone-coated steel shingles?

    Stone-coated steel roofing often consists of a 24- or 26-gauge steel core that is manufactured to resist rust. In addition, the steel is coated with a layer of stone which is permanently adhered to the surface of the steel, offering additional durability and design flexibility.

    Are metal shingles more expensive than asphalt?

    In general, metal roofs are higher in initial construction cost but also tend to require less maintenance. Shingle roof construction remains the most common, likely because it remains most economical.

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    How To Install Metal Roofing Over Asphalt Shingles 2021

    How To Install Metal Roofing Over Asphalt Shingles 2021. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. Leave the old valley flashing in place, and install new over it.

    Work your way upwards towards the top of the roof to install all the shingle tabs and ensure the surface is covered, and overlaps the ridgeline. Because asphalt shingles are routinely exposed 5 in., rip down the first strip so that it is 5 in. Condition of existing asphalt shingles


    Installing a metal roof over shingles. Attach with nails along the top edge of the strip.


    Leave the old valley flashing in place, and install new over it. Attach with nails along the top edge of the strip.


    For example, an architectural shingle roof (the most commonly used. Place these along every six inches of the metal roof flashing.


    Fiberglass core or matting, an asphalt coating and a ceramic or stone granule surface give this material its durability. Fasten the panels with metal roofing screws according to manufacturer instructions.


    Also, be sure that a breathable synthetic underlayment such as gaf deck armor is used in between the old asphalt and metal. Cut panels to size as needed using a circular saw with a compatible blade.

    Source: www.raremanufacturing.comSource:

    Is Metal Roofing Worth The Cost

    This really depends on how long term youre thinking. In the short term, shingle roofs are cheaper than metal. However, that changes as you consider longer periods of time.

    Metal roofs will last much longer than shingles. That alone improves the value of the metal roof. The fewer replacements you make, the more it saves you. This also applies to the durability of your roof. You will save money on repairs with metal.

    Additionally, metal roofing will save you money on cooling your home. It may not be much per year, but these things add up over time.

    If you arent planning on living in your house very long, then go with shingles. However, if you plan on living there for a long time, metal roofing will be the best choice you can make.

    All of the benefits of metal roofing apply whether installed on their own or over shingle roofing.

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    The First Step To Install Metal Roofing Over Shingles

    So you already know you can install metal roofing over a shingle roof. But with an existing roof system in place, its worth diving into a little more detail before making a decision.

    The next question is, Do you have to tear off your shingle roof?

    Not necessarily.

    Tearing off a shingle roof will only lead to double the costs in labor and installation.

    What matters is to check with your local building code whether your local building department will allow the installation of metal roofing over shingles.

    Your building department might only allow you to re-roof over one layer of shingles on your existing roof while some allow you to re-roof over two layers of shingles.

    Metal Roofing Over Existing Shingles

    Metal Roof Install Over Shingles

    One reason homeowners choose metal roofing is that many types of metal roofs can be installed directly over existing roof shingles, from asphalt shingles to wood shakes. This has the potential to save time and expenses, as well as avoid adding more waste to landfills. Take note, however, that this isnt possible for all metal roofing products. Standing seam metal panels, for instance, often require a smooth, flat deck as a substrate.

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    Install Metal Roof Over Asphalt Shingles

    By: Author Ryan M.

    So you want to replace your current asphalt roof with a new metal roof, but you want to know if its ok? Youve certainly heard about the potential when you install metal roof over asphalt shingles after doing some research or speaking with a professional.

    Is this, however, a good idea? Well break it down for you since we want you to have all of the critical facts concerning such a huge decision.

    Once you finish this article, youll know whether its a smart idea to install a metal roof over an existing asphalt roof, as well as some precautions to take.

    Check For Any Signs Of Water Leaks

    Whats the point of installing metal roofing to improve your roofs condition if there are existing leaks and holes?

    You dont install good over bad. That would only lead to a disaster or worse, your roof structure falling apart.

    Additionally, if you find any signs of rotting, make sure to have these fixed.

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    Can A Metal Roof Be Installed Over Existing Shingles

    This is the one question that a lot of homeowners keep asking. If you are one of them, we are here to answer your questions and assure you that yes, you can indeed install a metal roof over shingles.

    Now that we have answered the big question, lets also look at how this can be done as well as what can potentially affect the installation process and avoiding any mishaps.

    Why Install Metal Roofing Over Existing Shingles

    How to Install Metal Roofing Over Shingles

    Shingles might be an inexpensive roofing material, but they require maintenance and frequent replacement. Consequently, many owners simply tire of the constant expense, mess, and disruption to their business operations. Metal roofing offers building owners a way out of the shingle replacement cycle.

    Metal roofing typically requires a more significant up-front cost than new shingles, but metal roofing can last 50+ years with minimal maintenance. A metal roof also adds curb appeal to a building because they come in a vast variety of styles and colors.

    Longevity and aesthetics aside, metal roofing is made from recycled material and is 100% recyclable at the end of its lifespan. So for building owners looking to be environmentally friendly, its tough to find a more eco-friendly roofing option than metal panels. Shingles are rarely recycled, and because waste disposal companies and landfills receive so many shingles, they often charge a large fee to accept them.

    In contrast, installing a metal roof over existing shingles means that any shingle tear-off expenses, including disposal fees, are avoided entirely. Additionally, you gain all the benefits of a metal roof.

    Want to learn more about the differences between metal roofing and shingles? Check out this article from our partner S-5!

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