June 5, 2024 | horizonroofing

Understanding Asphalt Shingle Blistering: Key Insights and Solutions

Understanding Asphalt Shingle Blistering: Key Insights and Solutions

Asphalt shingles remain a top choice for homeowners due to their cost-effectiveness, robustness, and straightforward installation process. Despite these advantages, one challenge that may arise is the development of blisters on the shingles, a phenomenon that raises concerns about the roof’s longevity and performance. This article delves into the causative factors of asphalt shingle blistering, offering preventative measures and remedies, with insights from Horizon Roofing in Anaheim, CA, a leader in the industry.

Root Causes of Blistering in Asphalt Shingles

Blistering manifests as bubble-like elevations on the shingle surface, primarily due to the following reasons:

  • Moisture Entrapment: Trapped moisture within shingle layers is a principal cause. This moisture, upon heating under the sun, expands, leading to blister formation.
  • Inadequate Attic Ventilation: Poor ventilation exacerbates moisture problems, trapping heat and humidity in the attic, which then migrates to the shingles.
  • Manufacturing Flaws: Variations in asphalt distribution during production can weaken the shingle, making it prone to blistering under thermal stress.
  • Installation Missteps: Errors in installation, such as improper nailing or inadequate adhesive application, can compromise shingle integrity, allowing moisture ingress and subsequent blistering.

Strategies for Prevention

Preventative steps are crucial in mitigating the risk of blisters:

  • Ensure Proper Ventilation: Maintaining optimal attic ventilation is essential for regulating moisture and temperature, thus preventing blister formation.
  • Professional Installation: Engaging qualified professionals for installation can drastically reduce the likelihood of installation-related defects.
  • Select Quality Shingles: Opting for shingles from reputable manufacturers reduces the risk of defects that could lead to blistering.
  • Routine Maintenance: Regular roof inspections can catch early signs of blistering, allowing for timely interventions to halt progression.

Mitigation and Repair

Identifying blisters early is key. Replacement of affected shingles can prevent water infiltration and further damage, safeguarding the roof’s structural integrity. Engaging a trusted roofing contractor for inspection and repair ensures the roof remains in optimal condition.


Blistering in asphalt shingles, while concerning, can be managed effectively through understanding its causes, implementing preventive strategies, and conducting timely repairs. Horizon Roofing, located in Anaheim, CA, stands ready to assist homeowners in navigating these challenges, ensuring their roofs continue to protect their homes efficiently and effectively.

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