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How To Attach Metal Roof To Shingle Roof

Roof Replacements Are Expensive

DIY – How To Install Metal Roof Shingles (Rustic Shingles) – American Metal Roofs

Though its possible to learn how to install roof shingles on your own, its always best to leave it to an experienced professional. Roofing contractors know how to install different materials the right way, the very first time.

If you can, hire an experienced contractor and let them handle your roof replacement needs.

That said, did you know that there may be ways to extend the life of your current roof? Roof Maxxs all-natural treatment rejuvenates your worn-out asphalt shingles, adding up to five years of life to otherwise outdated materialsat a fraction of the cost of a roof replacement.

Contact us to learn more or to find a local contractor who can help you protect your roof with ease.

Issues You Might Encounter

Once youve made the decision to go with metal roofing over shingles, you will have several different issues to keep in mind:

  • Building codes
  • Condition of existing asphalt shingles
  • Aesthetics
  • Ease of installation.

In terms of building codes, many municipalities now have placed limits on the number of layers of roofing a residential building can have before requiring a complete tear-off.

Usually this number is two, meaning that if your roof already has two layers you wont have the option of installing a metal roof over shingles until youve removed at least one of the layers.

Shingle condition also plays a role, since a large number of missing, deformed, or curled shingles may narrow your options, requiring you to use a steel shingle system rather than a standing seam steel system.

Also, if the existing shingles on top are not level or in very poor condition, you may need to put a layer of roofing felt down or wooden frame over the shingles before installing the new metal roof.

In terms of aesthetics, you need to be careful in terms of choosing your metal roof solution so that it will blend into your surrounding neighborhood.

The traditional concern, of course, is that a metal roof will make your house look like a barn or storage shed if not done properly. But thanks to many different choices in color, size and shape, this is no longer a major concern.

Metal roofs on houses can look very attractive and dramatic.

Is The Roof Decking In Good Condition

If the roof has large leaks or long-term leaks, your decking may be in poor condition, rotting, or soft. If you arent confident your new roof will be fastened into a solid, reliable deck, remove the shingles and underlayment. Thoroughly inspect the decking and replace any areas that are in disrepair.

Also Check: Roofing Costs In California

Advantages Of Metal Roofs Over Shingles

Theres already plenty of advantages by choosing a metal roof, and theres even more when you decide to put a metal roof over shingles. They include:

Advantages of metal roofs in general:

  • Metal roofs have increasingly become a more popular option for homeowners due to their reputation for longevity and curb appeal.
  • They can last much longer than shingles. In fact, they can last for about 40-70 years depending on the material.
  • They can withstand almost any type of weather condition to keep your home safe, comfortable, and dry. Rain will quickly and easily drain, and snow will be able to melt slide off easily. They can also sustain wind gusts up to 140 mph.
  • Many of them also come with the ability to resist fire and withstand a hail storm without taking damage.
  • They can come in a wide variety of colors and finishes. These include the appearances of natural cedar shakes or stone.
  • They can improve your homes energy efficiency by reflecting solar radiant heat, which may even reduce cooling costs by 10-25%.

Advantages of metal roofs over shingles:

  • Metal roofs over shingles will also provide an extra layer covering your home, helping to further insulate it.

Can You Attach A Pergola To A Shingle Roof

How Metal Roofs can add huge value to a home

There are many types of backyard structures that you may want to connect to your homes roof. While we understand the desire to attach a pergola or other structure to your shingle roof, this is not as simple of a job as it sounds.

If you have your heart set on attaching your pergola to your roof, to get the job done for you. In partnership with your landscaper, builder and other professionals, your roofer can properly attach your pergola in a way that looks good, without sacrificing the longevity of your roof.

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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.

How To Install Metal Roofing Over Shingles Step By Step Ideas

How To Install Metal Roofing Over Shingles Step By Step. 1) remove the shingles before installing the metal roof the first way to install a metal roof over shingles is by completely removing the old shingles before installing the new metal roof. 1) remove the shingles before installing the metal roof.

1.apply an underlayment above the existing shingles. A benefit to doing it this way is that you can see if there is any rotten plywood that needs to be replaced before installing the new roof.

Read Also: How Many Screws Per Square For Metal Roofing

One More Pro Tip: Choose The Right Roofing Contractor

Most any roofer can nail a shingle, but there arent many local professionals with the needed specialty tools, training, and expertise for handling metal roofing properly. At Skywalker Roofing we can actually custom-fabricate your standing seam roof right on your property, and no one gives more attention to detail and proper workmanship than our skilled installation team!

Are you looking for high-quality roofing services in the Triad area? We specialize in the installation of metal roofing in less time. Were happy to serve the NC Piedmont Triad, Piedmont Triangle, Charlotte Metro/Lake Norman, and Roanoke, VA areas, and our customers give us an average rating of 4.9 stars across Google, Facebook, BBB, Guild Quality, Shopper Approved, and Angies List!

Ready to get the last roof youll ever need? Skywalker can make that happen for you! Reach out to us online, or simply give us a call today at . Experience the Skywalker difference for yourself!

Metal Roof Over Shingles Condensation

DIY – How To Install Metal Roof Shingles (Oxford Shingles) – American Metal Roofs

Metal roofs must be laid flat on a vapor barrier because steel will condensate if theres any air space underneath it. It doesnt matter if the air space is a half-inch or six inches because the condensation factor will remain the same. Put the steel down directly on a vapor barrier. You can either leave the shingles on or put down felt paper during new construction.

Also Check: Where Do The Screws Go On A Metal Roof

Can You Nail Into Your Roof

A roofing system is designed to keep water out of your home. Roofing professionals achieve a quality roof by layering various materials on top of the decking, or the wooden foundation, of your roof. There are many components of a pitched roof, from felt underlayment and ice and water protector to roof shingles and flashing. Together, these components force water to run off your roof into the gutters and away from your home.

If you drive even one nail into the top of your roof, you may compromise its entire system. That one nail will puncture the shingles and underlayment of your roof, creating a hole through the whole system. When it rains, water can enter the hole, bypass every layer of security on your roof and trickle into your attic. This nail may cause a small leak, and even small leaks can cause significant problems for your home.

You may be asking: Dont roofers use nails when installing roofs? Yes, professional roofers use nails to apply shingles, but they do so in a very specific way so that each nail is covered by the shingle above it. Adding another nail above the shingles compromises your roof system.

Improper nailing may void the limited wind resistance warranty on your roof. However, there are ways to attach any accessory you want to your home, without compromising the life span of your roof. A roofing professional will choose corrosion-resistant screws for this job, not just nails.

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.

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Why Install Metal Roofing Over Existing Shingles

Shingles might be an inexpensive roofing material, but they require a maintenance and need to be replaced pretty frequently. Unfortunately, shingles are typically not recycled, and because waste disposal companies and landfills receive so many shingles, they can charge a large fee to accept them.

Metal roofing offers building owners a way out of the shingle replacement cycle.

Metal roofing requires a more significant up-front cost than new shingles, but metal roofing can last 50+ years with minimal maintenance. A metal roof can also be used to add 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.

Installing a metal roof over existing shingles also means that any shingle tear off expenses, including disposal fees, are avoided entirely. And you get 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!

Types Of Metal Roofing

How To Metal roof for cheap

Before we get into the steps on how to install metal roofing its important to understand what types of metal roofs exist. While metal roofing can be made from a variety of metals, tin, zinc, steel, aluminum and copper are the most widely used and most commonly available options. Each metal has its own advantages and disadvantages, as well as cost considerations. Steel, for example, is the least expensive option while copper is the most expensive.

In addition to material choices, metal roofing is also available in three design styles: through-fastened panels , modular panels and standing-seam panels.

  • Through-fastened corrugated metal panels are the most common and readily available type of metal roof. They can be installed over roof sheathing or purlins.
  • Modular panels, which mimic other roofing materials like asphalt shingle and tile, are also available in a wide range of colors and styles. They, too, can be installed over solid sheathing or wood battens.
  • Standing-seam panels install over solid or skip sheathing and have the most complex installation process, so are typically best left to professional roofing installers.

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Considering Flat Pan Standing Seam Or 5v

Metal roofing panels that have wide flat spaces between ribs are more likely to transpose the shingle rows through the panel, creating a rippling effect called oil canning. While oil canning is still possible even with shingle removal, it is less likely. We recommend striations on standing seam to nearly eliminate oil canning also ask about the possibility of using foam backer rods beneath panels to help lessen the chance of this as well.

Installing Metal Roof Over Shingles Pros And Cons

Before proceeding with a metal roof installation over existing asphalt shingles, its important to first consider the pros and cons of this project.


  • Saves the cost of disposing of an old roof. Disposing of asphalt shingles requires the costly expenses of a dumpster rental and disposal fees.
  • Saves the labor or tearing off old shingles. Removing old shingles involves removing hundreds if not thousands of pounds of old material. Thats a lot of work.
  • Preserving the layer of asphalt shingles keeps the roof better insulated, saving energy costs


  • Old asphalt shingles have inconsistencies that can make the roof uneven. This can make it difficult to properly install a metal roof over the top of it.
  • Removing old asphalt shingles allows you to assess the condition of the roof. You wont be able to see rotted or damaged areas under the asphalt shingles without removing them
  • Adding a metal roof over the top of shingles will add additional weight, reducing the live load a roof can handle. While the weight may not be enough to cause problems, its worth considering, especially for roofs that see significant amounts of snowfall.

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How To Install A Metal Roof Over Shingles Furring Strips

There are several reasons why many people choose metal roofing materials. The most obvious reason is that the metal is much more durable and relatively inexpensive than wood shingles.

Usually, metal roofs are placed over furring strips for air circulation and to prevent rot. However, can you put a metal roof over shingles furring strips?

Benefits Of Sturdy Metal Roofs

Can You Put a Metal Roof Over a Shingle Roof?

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. But this is just one of many benefits of a metal roof. Here are four more:

1. Long life: A properly installed metal roof should last for 40 or 50 years or more before a replacement is needed.

2. Virtually impervious to damage: Metal roofs hold up in the most intense weather events from pounding hail and ice storms to gale-force winds and searing summer heat.

3. Very low maintenance: Because of their strength, metal roofs wont require regular, expensive repair jobs. Year after year, decade after decade, they retain their soundness.

4. Lowered cooling bills: As noted above, special coatings on metal roofs allow them to reflect and block heat rather than absorb it. This results in cooler interior temperatures in the summer and less need to use your AC system.

If youd like to know more about metal roof installation or metal roofing in general, contact the experts, Advanced Aluminum of Lakeland, FL. We manufacture top-grade metal roofing products used by leading contractors across the Lakeland region. Reach us with questions at 648-5787.

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Metal Roof Over Shingles Problems

While installing metal roofing over shingles is a convenient and cost-saving means of adding a new metal roof, it isnt without its pitfalls. In this section, well cover some of the problems youll encounter with this type of metal roof installation.

Roof sheathing is covered typically, the old shingles are removed before installing a new roof. This gives the homeowner a chance to inspect the roofs deckings for any problems such as rot to determine if structural repairs need to be made before proceeding with a new roof installation.

There is no thorough way to conduct this inspection when the roof is covered, which may lead to unwelcome surprises later if there are structural problems that are hidden beneath the shingles.

Complicates future roof repairs If there is a roof leak in the asphalt shingles, adding a metal roof will provide a patch for those leaks. However, if there is a leak in the metal roofing, water will run between the two roofs until it reaches the original leak, then leaks through the roof. This scenario can make the leak difficult to diagnose and fix.

Condensation The space between the original asphalt roof and the metal roof wont be airtight. This means damp air can get in between these two layers, causing condensation to form, which can lead to mold growth or rot.

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.

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Install Underlayment Or Framing

Many people think you can simply slap metal roofing right over asphalt shingles. This would be a mistake. Most old asphalt roofs have shingles that are peeling upward or pooching. Even roofs in good condition will increase about 1/8 of an inch in height with each course, creating a surface that isnt flat.

This uneven surface makes it difficult, if not impossible, to lay the metal panels flat on the shingles. Framing between the two roofs is required to flatten the roof.

Not having a buffer between the two roof materials can also cause damage to your new roof. Without at least an underlayment, the shingles can also damage the metal roofing.

Asphalt shingles are gritty and rough. As metal expands and contracts in the heat, it will rub against that sandpaper-like surface, slowly wearing away the metal roofing over time. Underlayment acts as a buffer to prevent this from happening.

Before beginning installation of the roof itself, decide how youll prep the roof. You have two options: underlayment or framing.

Use Underlayment

Create a buffer between the two roofing surfaces by installing roofing underlayment right on top of the old asphalt shingles. Check building code to see which methods are acceptable in your municipality.

You can use felt or tar paper underlayment or a synthetic material. Roll the tar paper out over the roof and attach with 1-inch roofing cap nails or a staple gun. Make sure to overlap each course of roofing paper by about 2 inches.

Use a 4×4 Frame


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