Actually, it was scraping up
asphalt attached to the factory floor, loading roofing membranes (that's roofing speak for the dark rolls of disgusting
black material that gets laid down over the
roof while inconveniently sticking to every far flung corner of the human body).
Cities, with their abundance of
black roofs and
asphalt parking lots, tend to absorb more sunlight and radiate more heat than the surrounding countryside.