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What are buckled shingles?

Bitumen roof shingles occasionally show buckles along the length of courses up the roof. First of all it is important to know that buckling is not the failure of shingles. Buckling is the result of shingles being distorted due to movement of the roof deck on which they were applied. Bitumen roof shingles have never been proven to buckle by themselves.

Vertical wrinkles

Shingle roof without ventilation

Failed shingle roof due to lack of ventilation

Shingle roof without ventilation