You know how crazy our weather gets here — one day it’s -22°F and your heating bill is through the roof, the next day it’s blazing hot at 107°F and you’re cranking the AC. That’s a 129-degree swing that makes your roof expand and contract like crazy. Add in the fact that we sometimes get 25 pounds of snow per square foot on our roofs, plus that intense mountain sun beating down at over 4,000 feet elevation, and you’ve got a recipe for roof stress.