What causes nails t...
 
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What causes nails to pop through shingles?  

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What causes nails to pop through shingles? Answered below

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When the temperature changes, expansion, and contraction can cause the nails to pop up and lift the shingles.

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It can be caused when roofing undetlayment expand and contract during the seasons. 

Additionally, when a nail was not set right during installation.

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