Homeowners frequently choose metal roofing because of its well-known longevity and low maintenance needs. It is susceptible to deterioration over time, just like any other material, though. It’s essential to routinely check your metal roof for signs of corrosion or damage in order to maintain its integrity. Every season, we at Shumaker Roofing, a family-run company in Maryland, advise thoroughly inspecting your metal roof. By being proactive, you can make sure that your roof is maintained in excellent shape and protects your house from the weather all year round.

image of a metal roof exhibiting oil canning - Shumaker Roofing

Oil Canning

Oil canning can happen on any kind of metal roof, including steel, aluminum, zinc, and copper. It is also known as elastic buckling or stress wrinkling. It happens when a metal roof is subjected to excessive stress and is unable to maintain its flat shape. As a result, the metal buckles and waves are created throughout the roofing structure. An expert roofer can inspect your roof and search for indications of oil canning. Oil canning has the following main causes:

  • Excessive strain or tension.
  • Tension on the metal roofing panels has increased.
  • Inadequate roofing contractors’ handling or storage.
  • There is not enough room for heat to expand and compress.
  • Improper installation carried out by a metal roofing contractor or firm.
  • Damage resulting from the production process’s cutting and rolling of metal panels.

image of a metal roof with visible leaks. - Shumaker Roofing


Every type of roofing is prone to leaks and holes. Due to wind, ice damming, structural damage, severe rain or snow, or other unfavorable weather conditions, even a metal roof may leak. A metal roofing contractor’s poor installation might also result in a leaky metal roof. The following factors could lead to a roof failing:

Fasteners: Screws that are too tight, loose, or oriented incorrectly are considered failed fasteners because they leave gaps that let water seep in.

Seams: Improperly made or seamed metal roofing panels could be the cause of a failing seam.

Flashing: Leaks may result from improper flashing. Flashing is material that is placed on a roof to lessen the possibility that moisture would damage joints or other features, such as pipes, chimneys, or valleys. Improperly installed or fitted flashing points have the potential to buckle and let moisture in.

Sealant: A metal roof’s structural integrity might be jeopardized by a failed sealant or butyl tape, which lets in dirt, water, and other debris.

Specifications: There is a higher chance of roof leaks if your metal roofing business installs your metal roof with insufficient specifications. Verify that the installation instructions follow the manufacturer’s specifications and adhere to their weathertight warranty.

image depicting scratches and scuff marks on a realistic roofing surface. - Shumaker Roofing

Scratching and Scuffing

Additionally vulnerable to scratches and scuffs is a metal roof. It’s possible that the metal panels will sustain damage before they ever get to your house. When roll-forming or installing the roof, or when a manufacturer or distributor is shipping the metal roofing panels to the customer, surface damage may happen. The metal panels should be inspected by your roofing contractor before installation. It is not recommended to employ a scratch or scuff that is severe enough to penetrate the panel’s metal base during installation. Roofing contractors, distributors, and handlers can lessen the possibility of scratches and scuffs by:

  • Using the right lifting equipment when handling coils.
  • Steer clear of sloppily treading on metal roofing panels.
  • Shielding metal roofing panels from objects like tools that could damage them.
  • Putting edge protectors in place to shield the metal roof edges while being transported.
  • Keeping roll-forming equipment in good working order to prevent component failure.
  • Coiling and recoiling the metal in the right ways to prevent rubbing and coating deterioration.

image depicting metal roofing corrosion. - Shumaker Roofing


For decades, metal roofs have been shielded from rust, corrosion, and deterioration. Although most metal roofs have a protective paint, finish, or coating that resists corrosion, no system is flawless. Metal roofing might also be vulnerable to:

  • Saltwater Corrosion: If you install a metal roof near the shore, you run the risk of having saltwater corrosion on your roof.
  • Utilizing Dissimilar Metals: If your metal roofing provider installs your metal roof using dissimilar metals, it may set off a chemical reaction that leads to corrosion.
  • Cut Edge: On a metal roof, a cut edge will result in edge creep or very slight rusting. By using a paint pen, hemming exposed edges, or installing lap flashing, your roofing contractor can lower this risk.
  • Underside Corrosion: Metal roof panels are prone to corrosion if their undersides are not adequately covered. If moisture becomes trapped underneath, it can weaken and corrode the metal. If your roofing contractor installs a metal roof over shingles or utilizes a granulated underlayment, the protective coating on the metal roof panels may scratch off, increasing the danger of corrosion on your metal roof.

image of a metal roof showing signs of fading and chalking - Shumaker Roofing

Fading and Chalking

A white residue known as “chalking” can be seen on coated or painted metal roof panels. It is the outcome of paint resin breaking down from extended UV exposure. The pigment in paint fades when it is exposed to UV light, water, pollutants, chemicals, or other substances. Because various metal roof panels are exposed to varying degrees of UV rays or other chemicals, metal roofs may experience uneven fading. A metal roofing firm can easily fix chalking and fading, and these are neither costly nor risky roofing issues.

Schedule a Free Roofing Consultation

Give us a call or send us an online message to arrange a free roofing consultation in Maryland. Our skilled metal roofers can examine your roof in detail, search for damage, and assist you in locating a long-lasting, permanent metal roofing solution. We won’t ever attempt to coerce you into paying for a good or service that you don’t require. As a reputable metal roofing firm with over 70 years of expertise, we have roofed thousands of properties. We put a lot of effort into offering dependable, high-caliber metal roof services in West Virginia, Maryland, and Pennsylvania. 


In conclusion, maintaining the integrity of your metal roof involves regular inspections and addressing potential issues like oil canning, leaks, scratches, corrosion, fading, and chalking. At Shumaker Roofing, we understand the importance of proactive maintenance to ensure your roof’s longevity and performance. With over 70 years of experience, our commitment to excellence ensures that each roof we service in Maryland, West Virginia, and Pennsylvania meets the highest standards. Contact us today for a free consultation, and let us help you protect your investment with our expert metal roofing solutions. Your roof’s longevity and safety are our top priorities.

FAQs: Metal Roof Maintenance: Common Issues and Solutions

1. What Causes Oil Canning in Metal Roofs? 

Improper installation, excessive stress on the metal panels, or inadequate handling and storage by roofing contractors often cause oil canning. Ensuring precise installation and careful handling can mitigate this issue.

2. How Can I Prevent Leaks in My Metal Roof? 

To prevent leaks, start by tightening all fasteners correctly, sealing seams securely, and installing flashing accurately. Regular inspections and maintenance are essential to catch and address any potential vulnerabilities early.

3. What Should I Do If I Notice Scratches or Scuffs on My Metal Roof? 

If you observe scratches or scuffs, it’s advisable to contact a professional roofing contractor to evaluate the extent of the damage. They may recommend solutions such as applying touch-up paint or replacing severely damaged panels.

4. How Can I Protect My Metal Roof from Corrosion? 

To protect against corrosion, select materials suitable for your environment, ensure the use of proper installation techniques, and apply protective coatings. Regular inspections are crucial, especially in environments prone to corrosion, such as coastal areas.

5. What Is the Best Way to Handle Fading and Chalking on Metal Roofs? 

To manage fading and chalking, consider repainting the affected areas with appropriate paint or applying a specialized sealant as recommended by roofing experts. Additionally, regular cleaning and maintenance can help minimize these cosmetic issues over time.