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lateral surface cracks on 3 tab

Jerry Lozier

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I see 'spider' cracking on Pabco Horizon shingles from time to time, these 3 tab are different. Not a real old roof and all are stuck down good. Weird cause it looks like they continue from one shingle to the next.

Could it be something from possible high heat in attic? Sufficient gable vents, no soffit venting????

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