Why Do Asphalt Shingles Curl?

Asphalt roof shingles are a popular choice for homeowners due to their durability and cost-effectiveness. However, one common issue that arises over time is asphalt shingles curling. This can be an indication that your roof is nearing the end of its lifespan. Understanding curling shingles on asphalt roofs and how to address the issue can help you maintain the integrity of your roof and avoid costly repairs or a full-blown roof replacement.

• Understanding curling shingles
• Different types of asphalt shingles
• 5 signs of asphalt shingle curling
• Protecting your roof

🤔 Understanding Curling Shingles

During a new roof installation, your roofing contractor will take steps to keep your brand-new asphalt shingles as moisture-free as possible. However, this does not mean that the individual tabs themselves are 100% free of water in any of its form. Some moisture is needed to keep the shingles both strong and supple. Over the course of its life span, this naturally occurring moisture can slowly disappear, causing the shingle to dry out. This leads to a common problem known as “curling.”

What Causes Curling?

Curling is a clear sign that your roof may need replacement soon. Here’s why it happens:

• Water trapped in asphalt granules: Shingles contain small amounts of water in their asphalt granules. Over time, as this water evaporates, the shingles contract.
• Curling on roof edges: Shingles at the edges of a roof are more prone to curling due to this contraction.
• Cupping in the middle: Shingles located in the center of the roof deck may experience “cupping,” where the edges lift while the center sinks.
• Poor attic ventilation: Insufficient ventilation can trap heat and moisture in the attic, accelerating shingle curling by causing the materials to degrade prematurely.

🏠 Different Types of Asphalt Shingles

When it comes to asphalt shingles, there are two primary types to consider: fiberglass and organic. Both offer distinct characteristics, benefits, and drawbacks, making it important to understand their differences before deciding which is best for your needs.

Fiberglass Shingles

Fiberglass shingles are constructed with a woven fiberglass mat that serves as the base. This mat is coated with asphalt, which makes the shingles waterproof, and finished with a layer of ceramic granules to protect against UV rays. These shingles are lightweight, durable, and resistant to fire, making them a popular choice for homeowners. Additionally, fiberglass shingles tend to be less expensive than their organic counterparts, while also offering improved longevity and energy efficiency. Their higher environmental friendliness, due to reduced asphalt content, further adds to their appeal.

While fiberglass shingles perform well in warm climates, they may not be as effective in extreme cold, where they are prone to cracking or damage. Regular maintenance and inspections can help prevent such issues and ensure they remain in top condition.

Organic Shingles

Organic shingles start with a base made of recycled paper, wood fiber, or other organic materials. This base is saturated with asphalt to make it waterproof, then coated with a layer of adhesive asphalt and ceramic granules. Known for their heavier weight, organic shingles are seen as more robust and able to withstand colder climates effectively. Their extra thickness gives them strong resistance to wind, making them suitable for regions that experience harsh weather conditions.

However, organic shingles require a higher asphalt content, which makes them less fire-resistant and more prone to moisture absorption. Over time, this vulnerability to water can lead to warping, curling, or premature wear. Due to these characteristics, organic shingles are becoming less common as homeowners and industry professionals opt for fiberglass alternatives.

⚠️ 5 Signs of Asphalt Shingle Curling

Spotting asphalt shingle curling early can save homeowners from more costly and extensive repairs down the line. Curling shingles weaken the roof’s ability to protect the home, making it vulnerable to water damage, leaks, and even structural issues. Below are some common signs to watch for and why they deserve your attention:

1. Curved Edges

One of the most noticeable signs of curling is when the edges of your shingles begin to lift or curl upward. This happens when shingles lose their adhesion to the roof due to weathering, moisture, or poor ventilation in the attic. These lifted edges create gaps where water can seep underneath, potentially causing roof leaks and damage to the underlying structure. Additionally, curled edges are more likely to catch in the wind during storms, increasing the risk of shingle breakage or even complete detachment. Addressing this issue quickly can prevent water infiltration and the need for more extensive repairs.

2. Cupped Shingles

Cupping is another form of shingle curling, where the middle of the shingle lifts, creating a concave shape similar to a bowl. This is often caused by prolonged exposure to moisture, such as high humidity or leaks that allow water to soak into the shingles from underneath. Sunlight exacerbates the problem by drying out the shingle material, causing it to lose flexibility and wear down faster. Cupped shingles not only affect the roof’s ability to repel water but also distort its overall appearance. Left unchecked, they can lead to widespread degradation of your roofing system.

3. Uneven Roof Surface

Step back and take a look at your roof from the ground. If the surface appears wavy, bumpy, or uneven, you’re likely dealing with curling shingles. This irregularity occurs when multiple shingles curl in different directions, creating a patchwork effect. Such inconsistencies compromise the roof’s structural integrity, making it prone to leaks and increasing the likelihood of wind damage. An uneven roof surface can also signal deeper ventilation or insulation problems within the attic, which need to be addressed to prevent further curling.

4. Cracks or Splits

Curling shingles are under constant stress as they bend and lose their original shape. This stress often results in visible cracks or splits in the shingle material. Cracks not only weaken the integrity of the shingles but also allow water to penetrate directly into the roof layers below, increasing the risk of rot, mold, and water damage. Cracked shingles also expose the roof’s underlayment to UV rays, accelerating its deterioration. If you notice cracks or separations in your shingles, it’s crucial to act fast. Replacing damaged shingles promptly can prevent further issues and prolong the life of your roof.

5. Granule Loss

Granules are the small, sand-like particles on the surface of asphalt shingles that provide protection from UV rays and physical wear. As shingles curl, they tend to shed these granules more rapidly. Without granules, shingles lose their ability to repel sunlight and water effectively, leaving them vulnerable to accelerated aging and damage. You might find granules collecting in your gutters, downspouts, or even around your home’s foundation. Granule loss is a clear indicator that your roof is deteriorating, and addressing it early can prevent more widespread issues.

💪🏼 Protecting Your Roof

Identifying these signs of asphalt shingle curling early is essential for maintaining the health of your roof and avoiding expensive repairs. If left unaddressed, curling shingles can lead to water infiltration, mold growth, and structural damage to your home. Regular roof inspections, proper attic ventilation, and prompt repairs are key to extending the life of your roof. If you’re unsure about the condition of your shingles, consulting with a professional roofer can help you assess the situation and determine whether repairs or a full replacement is necessary. Taking proactive steps now can save you time, money, and headaches down the line.

How to Check for Curling Problems

It’s not difficult to spot curled shingles. It shows itself as a clear physical deformity on the tabs themselves. Cupping might be harder to spot and might require a closer look at the middle of the roof itself. However, stepping on your roof is not recommended. Curled or cupped shingles are brittle and can break easily from being stepped on. Instead, call a professional to determine curling problems as soon as the symptoms become apparent.

🙌 Extend Your Roof’s Life with Expert Curling Repairs

Curling is a sign of an aging roof so it cannot be avoided. However, with proper maintenance and regular inspections from a licensed roofer, you can delay its effects and a few more years to the life span of your roof before needing a full replacement.

At ARCH Exteriors, LLC, our team of skilled and experienced roofing professionals can help you with any curling problems on your asphalt shingles. Give us a call at (877) 921-3756 or fill out our contact form to schedule an inspection and request a free estimate on roof repairs and replacements today.