Saturday, July 13, 2024
HomeMetalCan I Put A Metal Roof Over Shingles

Can I Put A Metal Roof Over Shingles

Can Moisture Get Trapped Between The Metal And Asphalt Shingles

Can You Put a Metal Roof Over a Shingle Roof?

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:

    Installation And Repair Usually Requires A Professional

    DIYers have been known to install and repair metal roofing, but it is generally not advised. Metal roofing is generally available only through select retailers, and the techniques for installation and repair are specialized skills. If you opt for metal roofing, you will likely be calling a specialist should problems occur. Fortunately, such problems are rare with metal roofs.

    After Adding The Metal Roof

    After adding the metal roof, there are a few things to check for:

    If you have a chimney, make sure you have roof crickets installed. This is a sloped backing that is built onto the chimney to allow water to run down the roof.

    Check the gutters and downspouts and make sure they are clear. If they back up, water will leak into the house.

    Look over the roof inspection checklist to see if there are any other issues.

    Recommended Reading: How To Fix Pop Up Camper Roof

    Benefits Of Metal Roofs:

    Metal roofing has proven over the years to be a great selection for you as a homeowner. They are durable in comparison to shingles which means they can even last a lifetime.

    Due to their durability in nature, they tend to save you on money unlike with shingles as you have to keep replacing them. Metal roofs, on the other hand, need minimal to no repair.Metal roofs have over the years have become a household must-have. They have helped homeowners upgrade the look of their homes while giving their homes a lasting value. Some of the benefits of metal roofs include: They are extremely versatile and can match different styles. Metal roofs are fire-resistant. This means that you do not have to worry in case of any fire accidents. They are energy efficient and are great at keeping homes cooler. Metal roofs are lightweight in comparison to other types of roofing such as shingles. Metal roofs are durable. They can last a lifetime without the need for replacement. Their ability to withstand adverse conditions acts as an added advantage. They allow for maximum shedding of rain and snow as metal panels interlock with each other and their surface is slippery. They are wind resistant due to the nature of the panels interlocking with each other. They are made of recycled material and can also be recycled at the end of their lifespan which is technically a lifetime. This makes them very environmentally friendly. They are very adaptable and can fit into various designs.

    Why Install A Layover

    Can You Re

    If its basically only a new roof that would accommodate a layover, it begs the question, Why install a layover? It doesnt take that much time or labor to remove the first layer of shingles that a layover gets your roofing project done faster or cheaper. In fact, a layover would only take longer because there are literally more factors to take into consideration since you have to think about everything you thought about to install your first layer of shingles plus your first layer of shingles.

    Also Check: How Long Does A Commercial Roof Last

    How Long Will Shingles Last On A Roof

    Dimensional shingles come with a 30-year manufacturer warranty. Vented properly and installed correctly, you should get around 80-85% of the life span out of an asphalt roof. That means you can expect to get about 20-22 years out of your 3-tab shingle roof and 25-28 years out of your dimensional shingles.

    Can Metal Roofing Be Installed Over Shingles

    Metal roofs offer the type of longevity and durability not often found in home building materials. In the humid and moist climate of Northern Florida, they can prove a far better option than traditional shingle roofs. Unfortunately, many people shy away from investing in a metal roof due to higher costs. Part of the high cost of metal roofs stems from installation best practices. After all, tearing off a shingle roof to install a metal roof can incur double the costs. This leads many to ask whether or not a metal roof can simply be installed over top of a shingle roof. Were here with your answer!

    Recommended Reading: How Much Is An Erie Metal Roof

    Manufacturer Warranty And Specifications

    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.

    Metal Directly Over The Shingle With A Layer Of Underlayment

    Considerations When Installing Standing Seam Metal Over Shingles

    Often the question arises: can you put a metal roof over shingles without intermediate layers. If you just answer it, then yes, there is such a method of installation. However, it is recommended to install a layer of underlayment before installing a metal roof.

    This thin layer is designed to protect the metal coating. Shingle roofs are covered with sharp granules on top, and this barrier prevents the protective layer of the metal roof from scratching.

    If you install of metal roof over shingles without this layer, you risk ruining the metal roof. This can lead to a decrease in its lifespan and the need for repairs after several years.

    Don’t Miss: How Much Power Does Tesla Solar Roof Generate

    Can I Have Metal Roofing Installed Over Shingles

    In short, it depends.

    Youll need to know a bit about your roofs history to determine if you can have metal roofing installed over your existing shingles. How many layers of old roofs lay beneath the surface?

    If you have two roof layers, most building codes will require you to remove and replace them with an entirely new one. However, if you have one layer of roofing only, then you could add another on top.

    You should check with Calgary roofing experts to see if your roof is a candidate for metal roofing, especially if you want it installed over the shingles you already have.

    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.

    Read Also: How To Do A Roof Over On A Mobile Home

    Do I Need Underlayment For A Metal Roof Over Shingles

    All roofs need an underlayment. If youre installing a metal roof over asphalt shingles, the shingles may be able to act as an underlayment for the roof. However, the shingles expanding and contracting can cause damage underneath the metal roof over time. For this reason, its usually recommended that you remove the shingles on your home before installing a metal roof.

    How To Install Metal Over Shingles

    Metal Roof Purlins Over Shingles

    Installing a metal roof is a big job. It can be a tricky process due to the materials and tools needed. If you have experience working with roofing or other difficult home improvement projects, you can DIY installing a metal roof over shingles. Your experience level may affect which type of metal roofing you install.

    Installing an overlay – placing metal over shingles – requires placing an underlayment over the shingles to provide a safety barrier to reduce condensation and prevent damage to the metal. On flat, even roofs, you can place the metal roofing directly on top of the underlayment barrier.

    place down purlins

    Another option for placing metal roofs over shingles is to place down purlins – long straight boards – over top of the underlayment and then screw the metal to these boards. This method is preferred for installing metal siding or for standing seam panels.

    Before you lay down your metal, you have to install edging – metal eave flashing – along the outline of the roof. Then you lay down each metal piece, using the appropriate method for your type of roofing.

    With standing seam panels, which are long straight pieces, they run vertically from the eave to the ridge on the roofline. Metal shingles lay horizontally in stacked rows.

    You May Like: What Is Mule Hide Roofing

    Adding Strips Of Wood To The Roof To Fasten Metal Roofing Down

    A common installation tactic for adding metal roof over shingles is to add small slats of wood and secure those slats of wood to the roof decking. These slats of wood run perpendicular to the metal roofing itself. The metal roofing is then secured to these slats of wood on the roof. This method does not require you to remove the asphalt shingles from the roof. However, you may still see some of the imperfections in the roof as far as dips and rises. These types of imperfections are much less noticeable with asphalt shingles.

    Strips of wood can be added to the roof to secure the metal roof over shingles. Shingles that are already installed on the homes roof

    Are Metal Roofs Noisy In The Rain

    This is one of the most frequently asked questions we hear from those considering the pros and cons of a metal roofing upgrade. Both homeowners and businesses have the same concerns about disruptive rain noise on metal roofs. The short answer is, yes, uncoated standing seam metal roofs can indeed be loud in the rain.

    Also Check: Do Metal Roofs Help With Cooling

    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.

    Roofing Over An Existing Roof: What You Need To Know

    Reasons to Install a Metal Roof Over Asphalt Shingles

    When you start noticing issues with your roof, or when it is nearing the end of its lifespan, it is probably time for some big decisions. You may wonder about the roofing options you have, and which one will be the best solution for you. The best thing to do then is to call in a professional roofer and discuss it with them, as they have both the needed expertise and experience to steer you in the right direction.

    If the condition of your roof is such that a fewrepairs will not suffice to get it back into shape, but it is still functionalenough that it doesnt need to be completely torn off and replaced, then youshould think about reroofing, i.e. installing a new roof over your existingone. Reroofing is not the same as roof replacement and there are certainconditions that your roof needs to satisfy in order to be a viable candidatefor reroofing.

    Keep reading to find out all you need to know aboutreroofing, including how it differs from a roof replacement and what its mainadvantages are.

    Don’t Miss: How Do You Measure Square Footage Of A Roof

    Ready To Switch To A Metal Roofing System

    If youre thinking about upgrading your roof, you can count on the experience and expertise of Roof Crafters your Baton Rouge, LA metal roofing contractor. With a Class-A fire rating and exceptional impact resistance, our metal roofing systems are designed to withstand even the harshest weather conditions and boost the energy-efficiency in your home. Metal is far more durable than asphalt, slate, and wood and resistant to algae, mold, and rust. For all your Baton Rouge, Hammond, and the Northshore metal roofing system needs or to get a FREE estimate, get in touch with Roof Crafters today at .

    Dont Miss: Cost To Install Trusses

    How To Avoid This Issue

    Install Ridge Vents

    Ridge vents run along the ridge of the roof and allow the warm air to escape at the top of the attic. Thus helping keep the attic cool. They work well with the soffit ventilation which is beneath the eaves and brings in the cooler air. It is essential that the vents are open and not full of debris or insulation for them to be effective.

    Also Check: How Much Does A Roof Salesman Make

    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.

    Comply With Local Building Codes

    Can You Install a Metal Roof Over Shingles?

    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.

    Also Check: What Is The Best Roof Ridge Vent

    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.

    Can You Put Metal Roofing Over Asphalt Shingles

    Most of the time you can however, there are some cases where you cant. First, check local building codes to determine if installing a metal roof over shingles is within code.

    Keep in mind that most localities will not allow more than two layers of shingles on a home. So, if your house already has a double layer of asphalt shingles, you wont be able to install another layer on top of it. This rule is there for a reason. Three layers of roofing are simply too much weight for the roof to safely bear.

    You can put metal roofing over asphalt shingles if the local building code allows and if you only have a single layer of asphalt shingles on the roof.

    Also Check: How To Determine If You Need A New Roof


    Most Popular