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Summer Roof Alert: Understanding and Preventing Roof Blistering

Updated: Jun 13

Picture this: a perfect summer day with clear skies and a gentle breeze. Everything seems idyllic until you notice strange bubble-like formations on your roof. These could be signs of roof blistering, a subtle yet potentially damaging issue that affects your entire home. Let's learn more about this below!

Understanding and Preventing Roof Blistering

What is Roof Blistering?

Roof blistering appears as raised lumps or bubbles on various roof types, including membrane, shingle, and flat roofs. These blisters, often filled with moisture or trapped air, indicate weakened material adhesion. While smaller blisters might be harmless, larger ones can cause serious damage if left untreated, compromising the roof’s integrity. Causes include temperature variations, humidity, trapped air and moisture, and poor installation. Prompt action is necessary to prevent further damage and prolong your roof’s lifespan.

Difference between hail damage and blistering

Hail damage and roof blistering may look similar but have different causes and characteristics. Hail damage results from physical impacts of hailstones, leading to circular or oval dents and leaks. Roof blistering is caused by internal factors like trapped moisture or poor installation, appearing as raised bubbles. Understanding these differences is crucial for correct identification, repairs, and insurance coverage, as hail damage is typically covered by insurance, while roof blistering may not be.

Causes of Roof Blistering

Understanding the causes of roof blistering can help homeowners prevent it. Here are the main factors:

Weather conditions

Severe weather and temperature fluctuations can strain roofing materials, causing blisters. Good insulation and weatherproofing can mitigate these effects.

Installation issues

Poor installation practices, such as inadequate sealing or inferior materials, can create conditions for blistering. Proper installation techniques and high-quality materials are essential.

Moisture buildup

Trapped moisture under roof coatings or shingles can vaporize and expand when heated, forming blisters. Effective moisture management and ventilation systems are crucial.

Manufacturing defects

Errors during the manufacturing process, such as incorrect granule placement, can lead to blistering. Using high-quality products from reputable manufacturers reduces this risk.

Consequences of Roof Blistering

Roof blistering can lead to several problems such as reduced lifespan, energy inefficiency, structural damage, and more.

Reduced roof lifespan

Blisters can cause the protective granules on shingles to disintegrate, accelerating UV damage and leading to cracked, delaminated, or missing shingles.

Energy inefficiency

Overheated roof decks from poor ventilation can release gases that worsen blistering and reduce energy efficiency, increasing heating and cooling costs.

Structural damage

Growing blisters weaken the roof structure, potentially causing leaks and requiring extensive repairs or even roof replacement.

Aesthetic issues

Blisters create an uneven roof surface, diminishing your home's curb appeal. Missing shingles from blistering can lead to a patchy appearance.

Higher maintenance costs

Ignoring blisters can lead to extensive damage over time, increasing repair costs. Regular maintenance and timely repairs can help manage expenses.

Water damage

Water-filled blisters, especially on flat roofs, can lead to leaks and interior damage, causing mold growth and structural issues.

How to Prevent Roof Blistering

Use high-quality materials

Investing in durable, weather-resistant roofing materials reduces the risk of blistering and extends your roof’s lifespan.

Ensure proper ventilation

Good attic ventilation allows heat to escape, reducing material expansion and contraction. This helps regulate roof temperature and minimizes moisture buildup.

Use high-quality materials

Investing in durable, weather-resistant roofing materials reduces the risk of blistering and extends your roof’s lifespan.

Keep the roof clean

Regular cleaning and proper drainage prevent moisture buildup, a key factor in blister formation.

Schedule regular inspections

Frequent inspections can detect early signs of blistering, allowing for prompt repairs and damage prevention.

Contact a professional roofing company

Professionals can accurately diagnose blistering causes and recommend effective solutions to preserve your roof’s integrity.

DIY Fixes For Roof Blistering

While some DIY fixes may offer temporary relief, they often fail to address underlying issues and can worsen the problem. Professional roofers have the expertise to correctly identify and repair blistering, ensuring your roof’s structural integrity. Entrusting repairs to licensed professionals saves time, money, and future headaches, avoiding safety risks associated with DIY attempts.


Roof blistering is a common but often underestimated issue that significantly impacts your home's durability. Understanding its causes and taking preventive measures are crucial for maintaining a healthy roof. For expert assistance, trust BMG Exteriors. With our dedication to quality roofing services, your roof will remain in optimal condition, providing lasting protection for your home.

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