Which blown-in insulation is best for Calgary, Alberta?

If you live in Southern Alberta, you are probably familiar with our winter rollercoaster. One day it is -25 degrees Celsius, and the next, a warm Chinook wind rolls over the Rocky Mountains, pushing temperatures above freezing in a matter of hours. While we all love a break from the bitter winter cold, these rapid temperature swings wreak havoc on local roofs. If you have noticed massive, heavy icicles hanging from your gutters, or thick ridges of ice building up along your r