Commercial Metal Roofing

Is It Possible To Do a Metal Roof Replacement Over Existing Shingles?

Due to their lower costs and long-lasting durability, metal roof replacement is highly popular. The question that many homeowners are asking is this: can a metal roof get installed over existing asphalt shingles?

It Is Possible And Here’s Why!

It is very much possible to install metal roofing over asphalt shingles due to their light weight and high durability factor. Asphalt shingles can weigh four pounds or more per square foot while metal roofing only weighs about a pound. This means installing it over an existing roof wouldn’t significantly burden the load of the roof itself, and as such, the shingles can remain.

Is It Worth Installing This Way?

The answer depends on a variety of factors as with anything else in life. Metal roofing materials are great insulators and they don’t need a hefty upfront investment unlike their shingled counterparts. Metal roofs can also reflect heat back and make it easier to control indoor temperatures. Ultimately, this protects the roof from trapping heat underneath.

Before investing in a metal roof, there are a few things to take into consideration:

  • Does your current roof exhibit leaks or have rotted spots? If so, these need to be addressed before a metal roof can get installed.
  • Are metal roofs over shingles allowed in your zoning laws? Some areas prohibit roofing installations in this way, so it’s worth checking.
  • Are there structural problems caused by the weight of your current roof? If you notice signs of sagging, dipping or buckling, these need repair before a metal roof can go up.

The granules that exist on the asphalt shingles can corrode the metal over time if a buffer material is not installed between the two components.

Advantages Of Choosing A Metal Roof

  • Unlike asphalt shingles, metal roofing can last up to five decades with limited care.
  • Metal roofing has the ability to withstand inclement weather patterns ranging from ice storms to heavy gale-force winds.
  • Another great aspect of metal roofing is that it requires very little in the way of maintenance or repair throughout the years.
  • Metal roofs have a special coating that eliminates the trapping of heat. This means that during the summer months, there’s less reliance on AC units.

2 Ways To Install A Metal Roof Over Shingles

Metal Roof Replacement ContractorsThere are two methods that are employed in order to install a metal roof over existing shingles. The first one is to apply an underlayment that will ensure no leaks or water damage occurs underneath the metal roof. Many asphalt roofing materials are prone to leaks over time, so this kind of additional protection is highly recommended by roofing professionals. This underlayment also offers an adequate barrier against corrosion from the asphalt granules and will prolong the life of the metal.

The second option is for the contractor to use purlins or battens. This involves directly screwing purlins into the existing roof deck depending on the existing construction’s layout. The metal roof is then laid over the purlin. This option offers a smoother finish as the contractor doesn’t use the metal to accommodate grooves and curves in the existing shingles.

Are you ready to invest in a new roof? If so, a trusted local contractor can help you go over the options available at your disposal. Armadillo Roofing & Exteriors (512) 333-7663 provides commercial metal roof restoration, commercial metal roof repair and commercial metal roof installation services to Austin, Texas and the surrounding Austin area communities. You can also reach us at

A metal roof may not always offer the best investment choice for property owners, but as a commercial roofing company, we can help by educating you. After assessing your needs and the state of your existing roof, we can discuss the next step for installation.

Commercial Metal Roof Repair

Your Options for Repairing or Replacing Your Commercial Metal Roof

Commercial Metal Roof Repair Experts

When deciding what to do about your commercial metal roof, the property owner and manager usually have three options. They can repair it, restore it, or replace the entire roof with a new roofing system.

When your metal roof is starting to leak, you have the make the same decision. Here is a guideline to help you decide whether you should repair, restore, or replace it.

Option 1 – Repair and Maintain

Metal roof systems typically have a lifespan of at least 30 years, but only if the original installation was done with high-quality workmanship. It is possible to repair a metal roof. Metal roof systems should be evaluated every two years so any problems can be identified early before they turn into something bigger and harder to fix.

Regular review and maintenance are the key to keeping a metal roof in good shape. If minor issues are addressed in time, there is less chance of any major problems developing down the road. Problems like oxidation can be fixed inexpensively. A roof check can discover fasteners that have come loose, and they can be tightened to prevent leaks. This is all part of the maintenance process.

Option 2 – Restoration

Commercial Metal Roof Repair CompaniesThe older the metal roof, the more likely it will develop leaks. Eventually, the condition of the roof will get to a point where the roof will need more comprehensive work. If restoration work is not done, the roof will continue to age and deteriorate. There is a narrow window of opportunity when restoration can still extend the life of the roof before replacement is required.

Restoring a metal roof requires certain procedures. These steps include tightening loose fasteners and protecting the roof with a rust inhibitor. There might be a need for further repairs depending on other damaged areas. After necessary repairs are made, a coating is applied to the roof for protection.

The material of the coating can one of two types. One is made from acrylic, and the other from urethane. Each one has limitations which must be considered when implementing a solution for roof restoration.

Austin Commercial Roofers You Can Count On

Option 3 – Replacement

The roof can be replaced with an innovative metal retrofit system. This system is suitable for a metal roof that has a low slope. Generally, this new roof system is installed directly over the old metal roof so the old roof system becomes the metal deck to support the new roof system.

How it Works

The retrofit system uses insulation boards to fill in areas of the metal panels between the ribs. This process creates a surface that is flush. After this infilling is complete, another layer of insulation board is applied. This creates a durable surface where the roof membrane will be installed. At the end, a single-ply roof membrane is installed to finish off.

Simulated Standing Seam

Sometimes the property owner desires a metal roof, but certain conditions of the roof are not compatible with the retrofit system. Roofs with more complex layouts or where the deck surface cannot be nailed might restrict the usability of conventional metal roof panels.

To address the needs of these special roof projects, roofing manufacturers have created simulated standing seam roofing systems. One such system is the Décor System from Sarnafil. This system starts with a standard PVC roofing system. After the roof is installed, a simulated standing seam rib is installed on the surface of the roof. This provides the appearance of standing seam, but it has the advantages provided by a single-ply roof membrane.

Traditional Metal Roof Systems

There are buildings where a metal roof is the most appropriate choice. There are different types of metal roof applications for these projects, such as metal roof shingles and standing seam panels. The right one depends on the other features of the project.

If you are unsure about the best roof for your building, call us. We can assess the current condition of your roof and help you make an informed decision on the most appropriate and cost effective roofing solution.

Armadillo Roofing & Exteriors (512) 333-7663, provides commercial roof repair, commercial roof installation and commercial roof replacement services to Austin, Texas and the surrounding communities and has been providing commercial roofing services to the area for over 19 years. When you need help specifically with a metal roofing system, visit us at our sister site –

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Commercial Roof Repair, Commercial Roof Replacement and Commercial Metal Roof Restoration for the Austin Area

Commercial Roof Repair

Need commercial roof repair? At Armadillo Roofing we offer customers affordable commercial roof repair options.

Commercial Roof Installation

Modified Bitumen, White Membrane, Metal or Green Roofing Systems, we can install the highest quality roof on your commercial building.

Commercial Metal Roof Repair

We'll keep your property's Metal Roofing System in top-notch condition with our extensive experience and expertise with Commercial Metal Roofing Systems.

Commercial Metal Roof Restoration

Let us show you how you can save a lot of money, as much as 30-40%, by restoring your commercial metal roof instead of replacing it.

About Us

I’m Mark Franz, the owner of Armadillo Roofing & Exteriors.

I’m proud to say no one can beat our quality and experience in commercial roof repair, commercial roof installation, commercial roof replacement, commercial metal roof repair and commercial metal roof restoration in Austin, Texas.

Some of Our Latest Projects

Check out these recently completed commercial roofing projects.

Whether you’re looking for commercial roof installation, commercial roof repair, commercial roof maintenance, commercial metal roof repair or commercial metal roof restoration, we here at Armadillo Roofing have you covered.

With Commercial Roofing we are experienced in Modified Bitumen, White Membrane, Metal, Tile, Shingle, Green and all Flat Roofing systems.

You can save a lot of money, as much as 30-40% over a replacement, by taking advantage of our commercial metal roof restoration services.

Some of Our Latest Projects

Here at Armadillo Roofing, nothing is more important than taking care of the most important asset we have – our satisfied customers.

We take pride in the number of 5 star reviews you will find online that our customers have posted.

We will always deliver on our promise to ensure the finest quality materials and craftsmanship, stressing integrity and rewarding excellence. We are craftsmen who take pride in the roofing services we provide to our customers, both commercial and residential.

Our commitment is to deliver “Quality Craftsmanship at an Affordable Price,” and we have been doing just that for well over a decade now in Austin and the surrounding areas.

“Thanks for taking care of us in a professional manner. It was a pleasure to deal with someone who actually did what he said he would do. Look forward to seeing you soon. Thanks again.”

Mike McCoy – Mission Mortgage

“Thanks for a job well done. I look forward to working with you in the future. Let me know if you need any references on your future jobs. I’d be glad to be of help. Take Care.”

Mike Wilson – Central Texas Development Assessments, Inc.,

“Thank you again for your hard work. You did an amazing job on our building’s roof system and I would certainly recommend Armadillo to anyone needing your services.”

A.W. Armstrong – Kestrel Management Services, LLC

“Armadillo Roofing replaced our old roof with a beautiful new one. David managed the entire process to the detail. He was there during the work and walked the roof with me after it was finished. Quality, friendly and trustworthy best describes our experience with Mark and David at Armadillo.”

Lisa Y. – Austin

“We had an amazing experience with Armadillo Roofing and can’t say enough positive things about them. They replaced our entire roof in time to put our house on the market.”

Court C. – Cedar Park

“A hail storm left us with roof damage. Armadillo was referred to us and we couldn’t be happier. David was onsite at the start and finish of each phase to ensure everything was done properly. Mark is engaged and responsive anytime we had questions. They do great work! I would recommend Armadillo to anyone.”

Danny W. – Austin