Occasionally?
A pinpoint metal detector showed nothing else.
Roofer had to come back & re-do. What a mess.,
Careless workmanship
Ray, I see them in my area working with ear buds on. I don’t think they hear much of what is happening! 
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It’s HOT in South Florida. Especially on a roof top that acts like a radiator for heat transfer.
Too hot to concentrate & the guys they put on the roof aren’t exactly scholars… … …
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