Archeological research reveals that insulating our homes using natural, renewable materials like fiber, wool, straw and cork, is actually as old as human history. And with good reason. Insulation is perhaps the most cost effective, straightforward path to peak functionality in the design and construction of buildings. And while many petroleum and chemical-based insulation strategies have risen up over the decades, we may be circling back around in a post-petroleum world to prefer insulation made from renewable, recycled and recyclable materials. This course describes the specification and use of these insulation materials.