Last year I did an episode of NTE where I listed off some of the more common materials used for insulation.  Since then, Ive received dozens of emails about brands and versions, etc.  So I thought since its currently -25F outside my office right now, this would be a proper time to dig a little deeper into insulation.  Ie also been doing a lot of investigative research for clients lately, and figured you'd enjoy learning all about how the manufacturers are so very eager to help me.  HA! Just kidding. They avoid me like the plague.