Why Do Asphalt Shingles Crack at Vents in Minnesota?
Asphalt shingles can crack around roof vents after Minnesota cold snaps because cold stiffens the asphalt while shingles, decking, and flashing contract at different rates. Cuts and fastening around penetrations can concentrate that stress. Surface-only craze cracking seldom leaks, but splits through the reinforcing mat or failed vent boots need prompt repair. For installation and…
