Damage & Failure
What is Blistering?
Roofing Glossary · Damage & Failure
Definition
The formation of bubble-like raised areas on the surface of asphalt shingles caused by moisture trapped in the shingle during manufacturing or by volatile compounds in the asphalt vaporizing under intense heat. Surface blisters weaken the shingle, pop and leave craters that allow water infiltration, and accelerate granule loss. Widespread blistering before mid-life is often a warranty-eligible manufacturing defect.
Related Roofing Terms
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Granule LossThe shedding of mineral granules from the surface of asphalt shingles due to weathering, manufacturi...
→CurlingA shingle defect where the edges or corners of shingles turn upward (cupping) or the center of the s...
→Asphalt ShinglesThe most widely installed residential roofing material in North America, consisting of a fiberglass ...
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