Repairing Roof Blistering: Bubbles in Roofing Materials


Roof blistering, characterized by the formation of bubbles or blisters on the surface of roofing materials, is a common issue that can compromise the integrity and aesthetics of a roof. asphalt shingle roofing installation In this comprehensive guide, we will explore the causes of roof blistering, its potential impact on the roof’s performance, and effective repair methods to address this issue.

Understanding Roof Blistering

Roof blistering occurs when air or moisture becomes trapped between layers of roofing materials, causing them to separate and form bubbles or blisters on the surface. These blisters may vary in size and severity, ranging from small, localized bubbles to large, widespread areas of blistering. Common roofing materials susceptible to blistering include asphalt shingles, built-up roofing (BUR), and modified bitumen membranes.

Causes of Roof Blistering

Several factors can contribute to the formation of blisters on a roof’s surface:

Improper installation techniques, such as inadequate ventilation or improper adhesive application, can create conditions conducive to blister formation. Moisture Intrusion: Water infiltration beneath roofing materials, either from leaks or excessive condensation, can lead to blistering as moisture becomes trapped between layers.Excessive heat from prolonged sun exposure can cause roofing materials to expand and contract, leading to the separation of layers and blister formation.Manufacturing Defects: Defects in the manufacturing process of roofing materials, such as inconsistent asphalt distribution or insufficient bonding agents, can contribute to blistering.

Impact of Roof Blistering

While roof blistering may initially appear as a cosmetic issue, it can have more significant implications for the roof’s performance and longevity:

Blistering weakens the structural integrity of roofing materials, making them more susceptible to damage from external elements such as wind, rain, and hail. Blisters create pathways for water infiltration, increasing the risk of leaks and moisture-related issues within the roof structure. Aesthetic Concerns: Severe blistering can detract from the visual appeal of the roof, diminishing the overall appearance of the property and potentially affecting its market value.

Repairing Roof Blistering

Effective repair of roof blistering involves identifying the underlying cause of the issue and implementing appropriate remediation measures:

Begin by conducting a thorough inspection of the affected area to assess the extent of blistering and identify any underlying issues contributing to the problem. Clean the surface of the blistered area to remove any dirt, debris, or loose roofing materials. Use a stiff-bristled brush or pressure washer to ensure a clean and smooth surface. For small blisters, carefully cut away the blistered portion of the roofing material using a utility knife. Apply roofing cement to the exposed substrate and press the remaining material down firmly to create a flat surface. Apply a layer of roofing cement or sealant over the repaired area to create a waterproof seal and prevent future blistering. Ensure the sealant extends beyond the repaired area to provide adequate protection. Address any underlying issues contributing to roof blistering, such as poor ventilation or water intrusion, to prevent recurrence. Consider installing additional ventilation or moisture barriers to improve the roof’s performance and longevity.


Roof blistering is a common issue that can compromise the performance asphalt shingle roofing repair and appearance of a roof. By understanding the causes of blistering and implementing effective repair methods, property owners can address this issue and prolong the lifespan of their roofing system. If you’re unsure about performing repairs yourself, consult with a professional roofing contractor to assess the situation and recommend the best course of action.

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