The folks at GreenovationTV and Old House Web are working on a net-zero energy renovation of a 100-year-old home. Through the process, they’re posting helpful videos, including this one on insulating uninsulated spaces. This kind of information is on the money for anyone living in an existing home, especially if you’re like me and you own an old house from 1958!
Despite the fact that we are now living in the 21st century, aerogel insulation seems like a material out of science-fiction. It is the lightest solid known, although by volume it is 99% air. It is breathable, but it doesn't absorb water. It is incredibly strong for its weight. But most importantly, it is a fantastic insulator.