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Can You Put Metal Roof Over Existing Shingles

Metal Panel Attachment Into Furring Or Lathing Strips

Considerations When Installing Standing Seam Metal Over Shingles

In this scenario, wood purlins or sub-girts are used as furring strips on the old roof and attached to the structure below. This framing system can be installed directly over existing shingles or applied over existing decking or underlayment. The new metal roof panels are then attached to the framing system.

The image above illustrates a general furring strip approach, although, as you might guess, there are numerous variations to this method. This method typically involves less mess than a complete tear-off.

However, with the added cost of the furring material and installation, the final price can be similar to tear-off. Although, it is undoubtedly more environmentally friendly since the shingles remain in place. This approach does add some weight to the roofing system, so its essential to determine if the structure can support the additional weight.

For more on this technique, check out this white paper by the Metal Construction Association.

When using this approach, its important to remember that the copper elements in pressure-treated wood may aggressively attack metal panels. Consequently, if using pressure-treated lumber for furring applications, a barrier of #30 felt or synthetic underlayment should be used between the wood framing and metal panels.

Can You Shingle Over Existing Roof Shingles: Complete Guide

It is not uncommon for homeowners to roof over existing shingles this is called reroofing. New shingles can be installed or laid over the old ones when a new roof replacement comes instead of tearing off the existing roof.Heres what inspecting houses for decades have taught me:

You should only reroof over existing shingles if the roof decking is in good condition and there is presently only one layer of shingles on your roof. Adding more than two layers of shingles can cause the roof structure to sag under the weight. Its best to replace flashings when re-roofing.

On a typical day, a roof replacement would involve tearing off the old roof down to the decking to remain only with the roofs trusses or rafters, which sometimes need to be reinforced if damage or rot exists. In reroofing, none of this happens.

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Question 3 Of : Do I Need Underlayment For Metal Roof Over Shingles

  • 1No, but only if the shingles are in really good shape. Underlayment is a layer of roofing fabric that goes on before you lay your roofing material or battens. It helps absorb moisture and prevents leaks from getting really out of hand. If your shingles are in really good shape, its not mandatory to install an underlayment over the shingles before you install battens or metal roofing.XResearch source
  • The most popular underlayment is 30# roofing felt. Some contractors will lay plywood over the battens and then nail the felt to that before installing the roofing.XResearch source This adds a lot of weight though, so this step is often skipped if the shingles are really thick.
  • 2You should use an underlayment if you want an added safety measure. Underlayment functions as a protective barrier. It absorbs moisture, prevents leaks, and protects the underside of your metal roofing. Its also fairly inexpensive to have installed as well, so you arent losing much by having a contractor add an underlayment even if it isnt strictly necessary.XResearch source
  • Also Check: How To Be A Roof Inspector

    Disadvantages Of Not Completely Removing Existing Shingles

    As mentioned above, there are tradeoffs involved in any decision. There are a few downsides involved with leaving the old shingles in place. They include:

    • Difficulty checking the framework and deck
    • Having to replace your new metal roof due to undetected deck damage
    • Condensation/Moisture problems
    • Damaged shingles may affect new roof
    • Restricted by some local building codes
    • May limit or void manufacturers’ warranty

    Putting aside the costs, one of the benefits of removing the old roof is that it allows contractors to evaluate the condition of the roof framework. There are ways to check without removing the roof, but they are not always as reliable as looking at it directly.

    When installing a metal roof over shingles there is little chance to do any direct evaluation. Skillful roofing contractors are more practiced at evaluating your Tampa roof no matter the condition.

    Be sure that your contractor carefully inspects and addresses any existing damage to your roof or shingles before adding a new metal roof. Ask how their installation will address and prevent issues with condensation. Be sure you understand how this type of installation affects the warranty on your new metal roof, as some manufacturers may limit or void warranty coverage in these situations.

    Do You Have To Remove Shingles Before Installing A Metal Roof

    How To Install Metal Roofing Over Shingles Step By Step / 7 Reasons To ...

    Although the answer is technically no, you dont have to remove the old roof, Bridger Steels team NEVER recommends installing a new metal roof directly over an old roof. This is because by installing the new roof over the old one, you can easily miss any damages, water spots, mold, or rot that may be underneath the old singles or materials, which can cause future damage. It can also result in having to remove the new metal roof a few years down the road to fix the underlying problems from the old shingles or underlayment, causing extra and easily avoidable work. Installing a new metal roof over an old shingled roof also affects Bridger Steels warranties because the abrasions from the rocks on shingles can cause backside wear as the metal expands and contracts from both hot and cold weather.

    Both of these careful inspections will give you the reassurance that once youve installed your new metal roof, no prior damages will affect your new roofs performance. Although removing shingles may be messy and take a bit more time, the end results and confidence in knowing your metal roof will last for decades to come are worth it!

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    Are You Able To Install A Metal Roof Over Shingles

    The short answer is yes. Installing metal roofing over existing shingles is an excellent approach used by contractors to help homeowners save on expenses and maximize the longevity of their new roof. While shingles might be a relatively inexpensive roofing material initially, they require constant maintenance and need to be replaced often.

    A key issue with this, besides the cost of replacement, is that shingles are not recyclable. Landfills and disposal companies can charge a large fee to accept them, and the consistent creation and disposal of shingles is harmful to the environment. However, a metal roof can be completely recycled at the end of its lifespan, helping to protect and preserve the environment.

    By selecting a metal roof, you are able to break free from the shingle replacement cycle. While metal roofing does require a larger initial investment, it can last over 50 years with little maintenance. A metal roof also adds to your homes curb appeal and value as it continues to look great over time.

    Can You Install A Metal Roof Over Your Existing Asphalt Roof

    So, can you install a metal roof over your old asphalt roof?

    The short answer is yes, youre able to roof over your old asphalt roof with a new metal roof under the right circumstances. Your current asphalt roof has to be near the end of its lifespan and still lying down pretty flat . With that in mind, most roofs wont be good candidates because of the wear and tear they go through during their lifespans.

    As long as the new metal roof is properly installed and your local roofing contractor does everything the right way, it can be done without a problem. Youll be able to save up to 25% in labor costs by not tearing off your old asphalt roof, installing new underlayment, or the fees to dump the old roofing materials.

    So, yes, you can install a metal roof over your old asphalt roof. However, I wouldnt recommend it.

    Because I don’t recommend it, you need to know how the two types of roofs compare to each other on important factors so you can .

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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.

    Question 1 Of : What Is The Best Way To Install A Metal Roof Over Shingles

    Can You Put a Metal Roof Over a Shingle Roof?
  • Install battens first, then lay your metal to maintain a gap. This is the most popular installation method. It involves installing 2 by 2 in or 1 by 2 in boards in horizontal and parallel strips on top of the shingles. This creates a gap between the metal and shingles, which gives your roofing materials a margin of error when it comes to contraction and expansion from temperature changes.XResearch source
  • This gap also keeps moisture from building up in between the layers of your roofing. If the metal roof ever leaks, the shingles will keep your roof safe if theres a gap.
  • Read Also: How To Fix A Roof Leak Around A Vent

    Should You Get A Metal Or Asphalt Roof Replacement

    Now you know you can install a metal roof over an asphalt roof. You also learned 3 warnings about getting a metal roof-over.

    Remember, while it can be done, I wouldnt recommend it. I understand everyone has a budget, but if youre investing in a metal roof, you should tear off your old asphalt roof. To get the best quality roof possible, you should always start from clean decking and replace all the crucial roofing materials.

    After reading this, do you still want to roof over your old asphalt roof with a metal roof? If you dont, are you having trouble deciding between upgrading to metal or sticking with asphalt for your replacement? Luckily, weve developed a quiz to help you find the right roof for you.

    The team at Bill Ragan Roofing has been replacing both asphalt and metal roofs in the Nashville area since 1990. Our attention to detail and high-quality workmanship you get a new roof that lasts for decades. When you work with us, youll never have to worry about your roof again.

    To help you find the right roof for your replacement, take this free Which Roof is Right for You Quiz.

    Can Moisture Get Trapped Between The Metal And Asphalt Shingles

    One of the benefits of a metal roof is that it is resistant to rotting and mildew. However, this benefit is cancelled out if moisture is able to get in between the new metal roofing panels and the old asphalt shingle roof.

    Moisture between these surfaces can result in mold and rotting which will ultimately lead to costly repairs.

    Here are two ways to eliminate trapped water vapor:

  • Ridge vents are designed to create constant air flow along the horizontal ridge of your house. They create a space for airflow that allows moisture to escape.
  • Furring strips will raise the metal roofing and allow for ventilating air pockets between the metal and shingles.
  • Every roof is different and must be analyzed by the roofing contractor to determine whats best for your specific roof. However, all metal roofs should have roofing underlayment regardless of whether its a new installation or being installed on top of an existing shingle roof. Roofing underlayment creates an added layer of protection from moisture.

    To learn more about how ridge vents will increase airflow and lower energy costs, we suggest reading:

    Recommended Reading: Does Home Insurance Cover Roof Replacement

    Is It Ok To Put A Metal Roof Over Shingles

    If youre considering upgrading your roof to increase its longevity or improve the overall energy efficiency of your home, installing a metal roof is a smart move. But if your home currently has a shingled roof, you may be wondering what your options are in terms of replacement. Will you need to tear off the existing roof to install the new one? Or can you install metal roofing over your existing shingles? Below, the experts at Paradigm Roofing outline what you need to know about installing a metal roof over an existing shingled structure.

    Manufacturer Warranty And Specifications

    How To Install Metal Roofing Over Existing Shingles : Inspecting Metal ...

    Some manufacturer warranties will not cover the metal roof if you install it over asphalt shingles. Some manufacturers may offer a warranty but exclude coverage for any problems that are related to the asphalt shingles. Make sure you understand the conditions of the warranty before you purchase the metal roof.

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    You Wont Get To Replace Crucial Roofing Materials

    When you get a metal roof-over, you bypass the tear-off process of getting a new roof. This will save you money, but you miss out on replacing crucial materials that are included in a full roof replacement.

    For example, one of these crucial materials is the underlayment. Its your roof systems last line of defense for keeping your decking dry. When you roof over your asphalt roof with a metal roof, you have to rely on the underlayment from your old roof. You also wont get the proper kind of underlayment specifically designed for a metal roof.

    Roofing materials arent meant to last forever. Thats why if youre already going to invest in a metal roof, I recommend starting from scratch with clean decking.

    To learn more about the crucial materials that are replaced when you get a new roof, read this article on the 9 materials included in your roof replacement.

    Is It Possible To Install Metal Roofing Over A Shingle Roof

    Yes, you can install a metal roof over existing asphalt shingles. As long as you meet all the requirements of your local building department, the shingles do not necessarily have to be removed before installing metal roofing.

    That’s the short answer to the question: can you install metal roofing over a shingle roof? However, just because you can doesn’t mean that you should. Before deciding to go this route, there are several important factors to consider. You probably have questions about the installation process, as well as the pros and cons of not removing your existing shingle roof. All of that and more will be answered in this article. Lets begin.

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    Average Cost To Install Metal Roof Over Shingles

    Metal roofing costs vary depending on the type of material. Metal roofing ranges between $1.50 and $2 a square foot, depending on the brand of the roofing. This compares to asphalt shingles which cost around $1.50 per square foot.

    Installing a metal roof yourself can save a significant amount of money. The cost of installing metal roofing costs between $7 and $14 a square foot for standing seam roofing and from $8 to $10 per square foot for metal panels or shingles.

    Do I Need Underlayment When Installing Over Shingles

    Metal Roof Install Over Shingles

    All roofs need an underlayment. However, when installing a metal roof over shingles, the shingles may be able to act as an underlayment. Over time as the shingles deteriorate, you may need to replace them with a proper underlayment. That said, if you do not wish to remove the shingles initially, it is best to ensure an underlayment is installed over the old shingles.

    Read Also: How To Cover A Flat Roof

    Learn More About Installing Metal Roofing Over Shingles

    If youre interested in learning more about replacing your shingle roof with metal roof panels, were here to help.

  • Use the Find a Contractor feature on our website to find an experienced installer near you to get a quote for your project.
  • Whether youre a contractor already working with our team at McElroy Metal or are interested in using our products for your next project, contact us today to learn more or become part of our national network of distributors and contractors.
  • Will The Warranty On The Metal Roof Be Void If Installed Over Shingles

    The specifications of your metal roof warranty will vary depending on the manufacturer. You, or your installer, must check the metal roof warranty to make sure that you arent breaching the warranty terms by installing it over asphalt shingles. Doing so will leave you without any coverage on your brand new roof.

    Read Also: Are Roofs Covered Under Home Warranty

    Should You Shingle Over Shingles

    The answer is yes, you can lay new roof shingles over old ones. … You can’t do it with wood or slate, for example, and you should never mix materials, such as laying asphalt shingles over cedar shakes. Also, the old roofing has to be in pretty good condition. Otherwise you’re just putting lipstick on a pig.


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