Why did this happen to my roof?
Canadian weather can be quite harsh and your roof experiences the worst of it all. Most houses built prior to 2010 have regular 3-Tab shingles on their roof. These shingles can only withstand winds of up to 60 km/h (which isn’t a lot). Over time as your roof gets older, the sealant underneath them begins to dry up; Leaving your shingles very vulnerable to external elements. This means that the next time the winds are strong or we face a storm, the wind can get underneath your shingle, your shingle tab starts to flap, and *shwoop* goes your shingle (Gone with the wind as they say). Leaving you with a dark spot on your roof (which is the backside of the shingle below it)