Understanding Asphalt Shingle Blisters and Their Impact on Roofing

Understanding Asphalt Shingle Blisters and Their Impact on Roofing

Asphalt shingle roofing is renowned for its durability, affordability, and versatility, making it a preferred choice for residential roofing across varied climates. However, like any material, it can exhibit specific issues, among which shingle blistering is a noteworthy concern. Skyview Exteriors, a leader in roofing services based in Providence, RHODE ISLAND, delves into the intricacies of asphalt shingle blisters, shedding light on their causes, implications, and the measures homeowners can take to mitigate their impact.

The Phenomenon of Shingle Blisters

Shingle blisters are small to medium-sized raised areas that appear on the surface of asphalt shingles. These blemishes can be either empty or filled with liquid, resembling blisters on human skin. While often considered a cosmetic issue, severe blistering can signal deeper problems affecting the roof’s overall health and longevity.

Causes of Shingle Blisters

Several factors contribute to the formation of shingle blisters, each related to the internal and external conditions affecting the shingle material:

  • Moisture Intrusion: Moisture trapped within the shingle layers during manufacturing can vaporize under high temperatures, causing the shingle to expand and form blisters.
  • Poor Ventilation: Inadequate attic ventilation traps heat underneath the roofing material, increasing shingle temperatures and promoting blister formation.
  • Manufacturing Defects: Variations in the manufacturing process, such as inconsistencies in the asphalt mixture, can predispose shingles to blistering.
  • Excessive Sun Exposure: Prolonged exposure to direct sunlight elevates shingle temperatures, contributing to blister development.

Implications of Shingle Blisters

While shingle blisters may not immediately compromise a roof’s integrity, their progression can lead to more significant issues:

  • Premature Aging: Blistered shingles are more susceptible to accelerated wear, reducing the roof’s overall lifespan.
  • Increased Vulnerability: Blisters can rupture, exposing the underlying roof layers to the elements and increasing the risk of leaks.
  • Aesthetic Decline: Extensive blistering detracts from a home’s exterior appearance, potentially affecting property value.

Preventive Measures and Mitigation

Addressing the causes of shingle blistering can prevent its occurrence and mitigate its effects:

  • Proper Installation and Ventilation: Ensuring that asphalt shingles are correctly installed and that the attic is well-ventilated can significantly reduce the risk of blistering.
  • Routine Maintenance: Regular roof inspections can identify and rectify potential issues, such as blocked vents or accumulating debris, that contribute to poor ventilation and heat buildup.
  • Choosing Quality Shingles: Opting for high-quality shingles from reputable manufacturers can minimize the risk of blistering due to manufacturing defects.


Asphalt shingle blisters, while not always detrimental to a roof’s functionality, warrant attention to prevent potential damage and prolong the roof’s service life. Understanding their causes and taking proactive steps to ensure proper roof installation, ventilation, and maintenance are key to safeguarding your home’s roofing system. Skyview Exteriors remains committed to providing Providence, RHODE ISLAND, with premier roofing services, offering expert advice and solutions to preserve the integrity and appearance of your asphalt shingle roof.