Your roof is one of the most important structures of your home, protecting you from the elements and keeping your living space safe and dry.
However, over time, roof shingles can develop problems such as curling, cracking, and blistering, which can compromise their durability and lead to costly repairs if left unaddressed.
If you’ve noticed signs of deterioration on your roof shingles, it’s crucial to understand the causes, potential risks, and best steps to take next.
In this guide, we’ll explore why roof shingles curling, cracking, or blistering occurs and provide expert recommendations on how to repair, replace, or prevent further damage.
Understanding the Common Causes of Roof Shingles Curling
Why does roof single damage happen?
There are very specific reasons for it.
They are:
1. Curling Shingles
Shingle curling occurs when the edges of shingles bend upward or underneath, creating a noticeable deformation.
This can happen for several reasons.
- Poor Ventilation: Inadequate attic ventilation can cause heat and moisture to build up, leading to premature aging and curling
- Aging and Weathering: Over time, shingles naturally deteriorate due to exposure to sun, wind, rain, and snow
- Installation Issues: Incorrect nailing, misalignment, or improper sealing can cause shingles to lift and curl
- Moisture Retention: If moisture gets trapped under the shingles, it can lead to warping
2. Cracking Shingles
Cracks in shingles usually appear due to weather stress and aging.
Factors contributing to cracking include the following.
- Extreme Temperature Changes: Shingles expand and contract with temperature shifts, causing them to weaken and crack over time
- Low-Quality Materials: Thin or substandard shingles are more susceptible to cracking
- Impact Damage: Storms, falling branches, or heavy debris can cause cracks in shingles
3. Blistering Shingles
Blistering occurs when air or moisture pockets become trapped under the shingles.
This forms raised bumps or bubbles on the surface. Causes include:
- Excessive Heat Exposure: Prolonged exposure to intense sunlight can cause shingles to overheat and form blisters.
- Manufacturing Defects: Some low-quality shingles may develop blisters due to trapped moisture during production
- Improper Ventilation: Poor attic ventilation can cause trapped heat and moisture to rise, creating blisters on the roof
Why You Should Address These Issues Immediately
Ignoring curling, cracking, or blistering shingles can lead to serious roof damage and expensive repairs.
Here are some potential curled shingle dangers.
- Water Leaks: Damaged shingles can allow water to seep into your roof structure, leading to leaks, mold, and interior damage
- Energy Inefficiency: A compromised roof can reduce insulation effectiveness, leading to higher heating and cooling costs
- Shortened Roof Lifespan: Small issues can escalate quickly, leading to a full roof shingle replacement sooner than expected
- Structural Damage: Water penetration can weaken the underlying wood, increasing the risk of rot and costly repairs
Best Next Steps for Fixing Roof Shingle Issues
If you’ve noticed signs of curling, cracking, or blistering, you need to follow some steps to assess, repair, or replace your roof shingles.
Here they are in detail.
1. Perform a Thorough Roof Inspection
Start by inspecting your roof to determine the extent of the damage.
You can do this yourself or hire a professional roofer for an inspection.
Look for:
- Curling edges or corners of shingles
- Visible cracks, splits, or missing pieces
- Blistering or bubbling on the surface
- Loose or missing shingles
- Water stains or leaks in the attic
If damage is widespread, it may be time for a full roof replacement rather than just repairs.
2. Address Minor Repairs Promptly
For isolated curling, cracking, or blistering shingles, small repairs can extend your roof’s lifespan.
Here’s what you can do.
- Flatten curling shingles: Apply a roofing adhesive underneath the curled shingles and press them back down. Use roofing nails if necessary
- Seal small cracks: Use a roofing sealant or caulk to patch minor cracks and prevent water infiltration
- Replace blistered shingles: If blisters have popped and exposed the underlying mat, replace those shingles to prevent leaks
3. Consider Partial Roof Replacement
If damage is limited to a specific area, a partial roof replacement might be a cost-effective solution.
This is ideal for the following situations.
- Sections exposed to harsh sun and wind
- Areas that have suffered storm damage
- Roofs with older shingles that are failing prematurely
4. Upgrade Ventilation and Insulation
Poor ventilation is one of the leading causes of curling and blistering shingles.
Ensure your attic has proper airflow to prevent heat and moisture buildup.
Consider:
- Installing ridge vents, soffit vents, or attic fans
- Improving insulation to regulate temperature fluctuations
- Sealing air leaks to prevent moisture from entering the attic
5. Replace the Roof if Needed
If more than 20-30% of your shingles are damaged, it may be more cost-effective to replace the entire roof.
Signs that a full replacement is necessary include the following.
- Multiple leaks throughout the home
- Widespread shingle deterioration
- A roof that is 15-20+ years old
- Signs of rotting or sagging in the roof structure
6. Choose High-Quality Shingles for Longevity
If you need a roof replacement, opt for durable, high-quality materials that resist curling, cracking, and blistering.
Consider the following materials.
- Architectural asphalt shingles (longer lifespan and better durability)
- Metal roofing (resistant to extreme weather and long-lasting)
- Composite or synthetic shingles (mimic traditional materials but last longer)
7. Schedule Regular Roof Repair and Maintenance
Preventing shingle curl and future damage happens by scheduling annual roof inspections and performing basic roofing maintenance.
You can take the steps below.
- Clearing debris and leaves from the roof and gutters
- Checking for loose or missing shingles after storms
- Keeping tree branches trimmed away from the roof
- Inspecting attic ventilation and insulation regularly
Final Thoughts: Protecting Your Roof for the Long Haul
Roof shingles curling, cracking, and blistering may seem like minor issues at first, but if left unattended, they can lead to serious roof damage and costly repairs.
Taking proactive steps to inspect, repair, or replace damaged shingles can help extend your roof’s lifespan and keep your home protected.
JLC Roofing, a roofing company with an A+ BBB rating, has been serving Phoenix and surrounding areas for 30+ years.
We are bonded, licensed, and insured, and we offer free-onsite estimates.
Contact our team to speak about how best we can serve your roofing needs.
Looking for the Best Roofing Company in Phoenix?
Trust JLC Roofing for top-rated roofing services with over 30 years of experience. We specialize in roof repairs, replacements, and emergency services, ensuring your property is protected with expert craftsmanship.
Contact Us Today at (623) 878-9832 or request a free estimate online!
