what sound does that can make on the roof
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It's thermal expansion and contraction. The sun hits your roof and heats it up. As the lumber expands, it moves, and it will rub against other pieces of wood that aren't moving at the same rate. This movement creates the popping noise.
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Most likely the cause of the noise is expansion and contraction of the material used for the new roof. ... In your case it sounds as if the roofer may have done some modification to the structure that required cutting into the roof. You might ask why would new wood on an old building make noise. Moisture is the answer.
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