Dennis, if you have sustained hail damage the shingles will show areas where the granules will have become dislodged from the shingle. You will be able to see the asphalt of the core of the shingle. While this does not usually present an immediate danger, if left alone the asphalt will decay from UV exposure and will become a leak problem. You will see areas that have become dented, granule loss or spots where the shingles may have fractured.
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