No real “gotcha” moment intended from me to you, but that roof looked extremely sketchy from the get-go. From the image, I’m just thinking it was tin to cover auto bays for a mechanic or auto paint technician. I live in TJ, but this is a standard setup in Mexico…
Compare to the “real” roofs of homes and businesses in the the same photo, and it doesn’t look so bad. I can even see the guy walking in the slush on his roof across the street.