Can anyone tell me what might be going on with these shingles? I have not seen this type of damage before.
The roof was installed in 2009. It’s a barn (gambrel) style roof. The pattern is at the sealing strip, and is on about 2/3 of shingles on the south and west, some on the east and north as well, but not as pronounced.
Infrared at the interior showed good insulation. I was not able to get into the upper attic to actually view. I have no idea what the ventilation was like. Just some passive vents in the upper roof.
I can see heat being an issue, but shingles shouldn’t fail like this even if they get hot should they? Ice damming is a bigger problem up here than overheating generally!
Thanks for any help you can give.