This is not good. Metal roofing is one of the best types out there for any building, including all kinds of homes. Thanks. There are two main ways to install a metal roof over a shingle roof. If your homes existing shingles are pretty curled, you could install a textured metal roof such as a metal shingle, shake, or tile directly over the curled shingles along with underlayment. In conclusion, battens can sometimes be helpful but I find those occasions to be few and far between, limited primarily to homes with insufficient attic insulation and ventilation. It can also help avoid roof top ice dams in the winter. While sealants and adhesives may be used, they are as secondary back-ups for protection against water infiltration. Monday through Friday during business hours you can Chat with us by clicking the red button at the bottom of our web pages, Email us at info@mccarthymetalroofing.com. Get an estimate or schedule your appointment today, Home | Our Blog | How To Install Metal Roofing Over Shingles, Reviewed by Tomas Kalkys. 
In fact, a metal roof thats built properly will be able to handle anything Mother Nature throws at it. This is one of the many reasons metal roofs keep growing in popularity their installation doesnt require completely tearing off the existing roof, which is a time-consuming and expensive job.
Underlayment provides extra protection. Metal roofs have increasingly become a more popular option for homeowners due to their reputation for longevity and curb appeal. Otherwise, they would be found everywhere! ","acceptedAnswer":{"@type":"Answer","text":"If you research how to install a metal roof over shingles, youll find that you cannot put a metal roof over three layers of shingles in most cases. Depreciation may also significantly reduce the amount youd receive. So, if you plan those improvements now, do not do something to the roof that could make it more prone to condensation when those other things are done. This should be obvious, but make sure you wear gloves! This way the building department knows that the plywood is in good condition and can be reused for another roof. This could include things like sagging decking or buckling trusses. Even if there is an existing roof in place, it is getting a lot of foot traffic while the new metal roof is installed as well as having nails pounded through it. ","acceptedAnswer":{"@type":"Answer","text":"Youll need to check with your local building department to see if you can install metal roofing over two layers of shingles. 
What we said above about installing metal over shingles is true in the majority of cases. When installing the roof, the screws should be applied as specified by the manufacturer (in the flat of the steel, not the rib), and in a way that the spacing creates an appealing view from the ground. So, why are underlayments necessary? But its always best to check with your local building and zoning departments to make sure they approve metal-over-shingle installations. I interpret the International Building Code as requiring it and its just a good practice. Print, complete and email or fax us your order.
For one, you will need to check with your local building department and ask if this is an approved installation method.
One issue with 30-pound felt was that, because it is an oil-based product, it would sometimes stick to the underside of the roof panels during hot temperatures. http://www.asktoddmiller.com/roofing-help-videos/buying-a-new-roof-part-4-2-ventilation/ Does that sound like adequate ventilation? You will most likely never have to purchase another roof again in your lifetime. This can cause the paper to tear when the metal roofing expands or contracts as it is designed to do. Metal roofs over shingles also present a number of problems. The first way is to run new underlayment over the existing shingle roof, completely covering the old roof. Ventilation allows that condensation to drain and/or evaporate without reaching your homes structure. One effective way to use battens is to cross batten. The dead airspace in the hollow beneath these panels acts like the dead airspace between two panels of glass in a thermal pane window. I hope this article has been helpful. But heres one more thing for you to consider: Do you realize that if you select metal roofing that this will likely be the last decision you make about the roof of your home? My interpretation of the code also requires them even if the old shingles are left in place. Two of the most popular roofing materials on the market are metal and asphalt, and both offer different pros and cons to a customer. The purlins are screwed or nailed down to the roof deck, depending on how the metal roofing manufacturer has testing for their roofing panels, and then the metal is installed to the purlins. The Florida building code, which is the minimum building standards that buildings have to be built to, including roofing, says that you can't have more than two layers of roofing materials on a residential house. You can either leave the shingles on or put down felt paper during new construction. The other method is to install 1 x 4 purlins throughout the roof. Its an easy way to prevent cuts on your hands. log in. In simplest terms: Yes, you can install a metal roof over shingles. Reach us with questions at (863) 648-5787. I normally suggest a layer of one of the higher quality synthetic underlayments, and ice and watershield if required by code.
Expansion and contraction of the roof panels could then damage the underlayment. Also, try not to use nails anymore because screws work much better. Here are links to videos on ventilation: http://www.asktoddmiller.com/roofing-help-videos/buying-a-new-roof-part-4-ventilation/ There are a couple of advantages when it comes to installing metal over shingles.
If you dont want to take our word for it check with your local building department. Sitemap: HTML | XML. This is the fastest way to install but it doesnt provide the flattest surface for metal roofing installation.
Many of them also come with the ability to resist fire (whether its a lightning strike or a wildfire) and withstand a hail storm without taking damage. He said he would lay the metal right over my current shingles. Over time the granules from the shingles could imprint on the metal panels, the underlayment helps prevent any imprinting. 
More than likely they won't just come out and say yes. When you decide to go ahead with this project there are a couple of precautions regarding the underlying material: A layer of underlayment installed on top of the existing shingles will help keep the granules of the old shingles from rubbing against the back of the metal and causing possible corrosion. If your metal roof is to be installed over solid decking or over existing shingles (an environmental benefit), a layer of quality underlayment between the two is essential. Also I have heard a lot of horror stories about the attic not being properly ventilated, causing condensation inside the attic. Here are four more: If youd like to know more about metal roof installation or metal roofing in general, contact the experts, Advanced Aluminum of Lakeland, FL. The second way is to install 1x4 purlins over the shingles. Standard tar paper has a tendency to stick to the back of metal roofing. Not only are they visually appealing, but theyre also much more durable than shingles. The first is to apply an approved underlayment over the old 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. What is the best way to hold the underlayment down, roofing nails? This can cause higher moisture levels in the attic. If youre installing a metal roof over asphalt shingles, the shingles may be able to act as an underlayment for the roof. What do you guys perfer/ recommend for underlayment? This has very positive results as far as keeping heat out of the attic. The first is that it helps you save the labor costs of removing the shingles and prevents them from being thrown into landfills. Founding farther of Legacy Service. At Legacy Service, we love just about everything about this type of roofing. However, the shingles expanding and contracting can cause damage underneath the metal roof over time. However, a true standing seam, especially one without any sort of striations or stiffening beads in the center of the panels, will probably show oil canning as the result of going over curled shingles. We also manufacture an extensive list of flashing profiles to meet any standard or custom application as needed. This is more expensive but will also be higher quality. However, if you choose a metal roof that is either light in color or has reflective pigment in the paint, that will be very helpful as well. Not only do they look beautiful and unique, but theyre also designed to last decades longer because of their durability. MFMRS manufactures a wide variety of metal roofing products including Multi-Rib (AG), PBR/R, 5V and Standing Seam in a Galvalume mill finish, as well as a wide variety of colors to meet all your preferences. They include: Like most other things, there are a few disadvantages of choosing metal roofs. Installations over battens alone are an invitation to condensation issues on residences. ","acceptedAnswer":{"@type":"Answer","text":"Yes, its possible to put metal roofing over shingles. Also, consider ice guards even if you dont have gutters. They can improve your homes energy efficiency by reflecting solar radiant heat, which may even reduce cooling costs by 10-25%. If youre considering getting a metal roof, you may be wondering if you can install it over shingles. Here are the questions our team is most frequently asked about installing a metal roof over shingles. 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. This product is in stock at my local lowes and I would only need two rolls of it. "}},{"@type":"Question","name":"How to install metal roofing over asphalt shingles","acceptedAnswer":{"@type":"Answer","text":"Whether youre looking to install a steel roof over shingles or another type of metal, its a good idea to learn the know-how. The airspace will also allow natural venting to take place. Address any existing roof leaks and replace rotten rafters or sheeting. Metal roofs over shingles also present a number of problems. ","acceptedAnswer":{"@type":"Answer","text":"All roofs need an underlayment. So when we talk about metal roofing over shingles, how does it work? E-Foil or foil faced, bubble wrap type, reflective barrier insulation can also be used as a cushion between the existing roof and the new metal roofing. In most cases its not even an issue if you are only going over one layer of shingles. Youll need to check with your local building department to see if you can install metal roofing over two layers of shingles. I would use whatever you can source locally.
More information here https://www.metalroofingsource.com.
Radiant barrier insulation will perform the best when used with a corrugated panel that has a built in airspace due to the corrugation. But first, here are a few precautions about the underlying material: 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. They will be able to tell you what you can and can not do. Metal, although super-strong, is very light, weighing less than a pound per square foot compared with as much as four pounds per square foot for asphalt shingles. They can also sustain wind gusts up to 140 mph. And then you put down horizontal battens for the roof panel attachment. Your message has been sent Metal is the best choice due to its very low weight per square foot and its unique design. Your metal roofing contractor will tell you about options for this. Thanks! We look forward to speaking with you! Some areas will only allow re-roofing over one layer of shingles while others will allow over two layers. If you wish to install metal roofing over shingles, its recommended to do it one of two ways. "}},{"@type":"Question","name":"Can you put a metal roof over three layers of shingles? The typical underlayment being used today is a low weight polymer based synthetic underlayment which lasts longer and is easier to install than the old asphalt based felts or tar papers. Next, I highly advise the use of a layer of underlayment over the old shingles or decking whether or not battens are used. If your new metal roof is installed over composition shingles, the rough surface of the composition shingles can scratch the back of the metal panels as they expand and contract with temperature changes. These polymer-based products are longer lasting and easier to install than 30-pound felt. I often get asked what the importance is of underlayment beneath a metal roof. If that moisture hits a cool surface, it will condense. But you might be wondering what the advantages and disadvantages are and what to keep in mind during installation. The second is that the shingles provide an extra layer over your home, which helps insulate it further. Can you imagine screwing a metal roof, or anything for that matter, into rotten wood? For this reason, red rosin paper was often placed over the roofing felt to act as a slip sheetand prevent oils out of the underlayment from sticking to the roofing. And, while condensation on the back side of metal roof panels is not a common thing, they will keep that condensation if it does occur from reaching lumber or getting inside of the building. When you install your new metal roof over an existing shingle roof, you immediately save money that normally would be spent to have the old roof torn off. Metal roofs over shingles will also provide an extra layer covering your home, helping to further insulate it. By placing metal roofing over shingles, you can save in the labor costs of ripping them off while also preventing them from being thrown into landfills. These products usually have an integral airspace or an insulated cavity between the metal and the roof deck. Remember that if you choose to install metal roofing over shingles, its best to add an underlayment or purlins. The reflective barrier insulation can also reduce your cooling cost during the summer months by reflecting heat away from your homes roof. 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. For many years, the standard underlayment beneath a metal roof was 30-pound felt. Metal roofs must be laid flat on a vapor barrier because steel will condensate if theres any air space underneath it. 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. Our Multi-Rib panel gives you the option to apply directly over shingles, no tear-off required!
Rain will quickly and easily drain, and snow will be able to melt slide off easily. However, youll want to check with your local building department before you make any decisions. {"@context":"http://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Can you put a metal roof over shingles? Remember that if you choose to install metal roofing over shingles, its best to add an underlayment or purlins. One big advantage to metal roofing is that it is light weight, which makes it the perfect material to be installed over an existing shingle roof. But this is just one of many benefits of a metal roof. Now as to the potential benefit of battens. In warmer climates beneath metal roofs, especially metal roofs that have direct contact with the underlayment, high temp underlayments are commonly called for. Yes that is typical of what is often used. However, youll want to check with your local building department before you make any decisions. The purlins allow for a flat surface for the metal panels. Finally, if the roof should have a flashing or something that occasionally in certain extreme weather conditions bleeds a little water, a quality underlayment will prevent that water from getting into the structure as well. By design, some metal roofs MUST be installed over battens, some MUST NEVER be installed over battens, and some can be installed over battens OR solid decking. However, cross battening significantly raises the roof level. The second is that the shingles provide an extra layer over your home, which helps insulate it further. McCarthy Metal Roofing. Additionally, I want to point out if you install things in your home like tighter windows, house wrap and siding those things will reduce the ability for moisture inside the home to exit through the walls. Everything I see on lowes website is very expensive. (2021), Metal Roof vs. Shingles Cost Comparison (2021), 5 Reasons to Roof with Centura Metal Shingles, How to Convince Your HOA to Allow a Metal Roof, Shipping, Offloading, and Damages Information. Should their be a moisture barrier or some kind of moisture wrap put on top of my shingles? Written by LegacyUSA Team. EverGuard thermoplastic polyolefin (TPO), How To Install Metal Roofing Over Shingles. I have done research and know that this is very common. Your attic ventilation and insulation will also help with summer energy efficiency. That is a good thing. These include the appearances of natural cedar shakes or stone. Also, dont go up on the roof if its windy. In all cases, underlayments beneath metal roofs should have smooth, non-granulated surfaces so they do not scratch the backs of the metal roof panels. We specialize in custom profiles serving a wide variety of needs in the construction industry. Fortunately, in most areas, it wont be an issue if youre only going over one layer. This creates a thermal break which is very similar to a vertically seamed metal roof installed on battens. All of the edges must be wrapped with flashing, which improves the appearance and provides resistance against rain, snow, and wind. These scratches can damage the metal roofing panels and lead to premature failure of the roofing system. The second benefit would be that it acts as a buffer between the back of the metal roof and the shingle roof.
All roofs need an underlayment. This installation method also allows you the flexibility of adding a radiant barrier under the metal roof to help with heat transferring into the house, which should help the air conditioner from running as much. The first is that it helps you save the labor costs of removing the shingles and prevents them from being thrown into landfills. Good question. Over time if there wasn't a buffer in between, the shingle granules would wear away at the back of the metal roofing panels. This method has its benefits as well. Its also 100% recyclable, making it eco-friendly. Feel free to browse our Installation Manuals for more information. There are two main methods when installing metal panels over shingles. This means the extra insulation from your shingle roof will not act as a heat trap for heat emanating through your metal roof.
For this reason, its usually recommended that you remove the shingles on your home before installing a metal roof. Yes, its possible to put metal roofing over shingles. When they are installed correctly using the right materials, they can withstand just about anything. HI, I recently had storm damage to my shingle roof. We are here to help. Maybe, but have you considered your other options? They also serve as both a slip sheet and an underlayment. Other areas will allow you to re-roof over two layers. Titanium is probably one of the more well known underlayments, but there are a myriad of manufacturers. Condensation will lead to mold, etc. From your response, the contractor is right with exception of some sort of underlayment. It also could cause the roof to interfere with skylights, clerestory windows, dormers, and even chimneys and plumbing stacks. Another added benefit is that the layers of your old roof will further insulate your home. Send Us an Email, Copyright 2021. "}},{"@type":"Question","name":"Do I need underlayment for a metal roof over shingles? The first is to apply an underlayment directly on top of the shingles. What does it do and is it really necessary? I am almost 100% decided with going to a metal roof. From there you have a couple of different installation methods to choose from, either fastened to the existing roof or through the use of purlins. Recent years have seen the development of many new underlayments generically called synthetics. "}},{"@type":"Question","name":"Can Metal Roofs Be Installed Over Shingles? Customer service and pricing available from 8:00 am to 5:00 pm MST Monday Friday. Section 1511.3.1 of the 2018 International Building Code (International Code Council Series) 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. This provides a couple of benefits: The first one being that the new underlayment will act as a second line of defense in case water were to somehow get underneath the metal roof. Even with their durability, which helps increase value and balance over the expense over time, many homeowners simply cant afford to install metal.
Thanks for all the help this far. Underlayment prevents that from causing a problem. 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. He even had some pretty cool looking texture painted ones. This is the fastest way to install but it doesnt provide the flattest surface for metal roofing installation. While your home may have been fine with asphalt shingles and no ventilation, the addition of a vertical seam metal roof will reduce the roof deck temperature even just a slight bit. If the current roofs weight has caused structural problems like buckled trusses or decking that is sagging, these issues need to be addressed before new installation begins. For this reason, its usually recommended that you remove the shingles on your home before installing a metal roof. Kynar 500 Explained How Can Metal Roofing Last for Decades? When it comes to the cosmetics of your roof, the trim is the most important aspect. You also could install a corrugated through-fastened metal roofing product and probably not have issues. We also see ice and watershield underlayments being used where required by code, usually on the roof perimeter and up the valleys. I have been getting opinions from people that are not experts and everyone seems to have different opinions about everything. 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. Get a FREE QUOTE: Click or call 919-900-1100. This is more expensive but will also be higher quality. If there are any signs of problems caused from the previous roofing weighing too much, they must also be addressed. However, the shingles expanding and contracting can cause damage underneath the metal roof over time. To protect your home during the installation process. So, its possible to have the installation of metal roofing over shingles, which is great news! And, a great alternative to battens are the metal shingles, shake, slate, and tile products which have an integral dead air space between the metal and the roof deck, serving a function similar to that of battens. What is the purpose of the underlayment? Asphalt shingles can weigh up to four pounds per square foot depending on the brand. If youre installing a metal roof over asphalt shingles, the shingles may be able to act as an underlayment for the roof. Then, you can pitch the warranty after about five years. Youre probably wondering about the cost to install a metal roof over shingles. If youd like to learn more about metal roof replacement, contact our Legacy Service team today to schedule an appointment. And, even if the metal roof is installed on battens or purlins, there should still be an underlayment on top of the roof deck beneath the battens. This means gutters will have to be re-hung. President. All Rights Reserved.
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