Katherine from 360Chestnut sits down with Jim Lockwood from Green Guild to learn more about insulation. Jim explains that retrofitting insulation usually starts in the attic because it’s the easiest place to get to. If the attic is un-floored and has enough ventilation, open blown cellulose would be used. Cellulose is recycled newspaper that will be blown into the attic to a depth of approximately 11 inches. However if there is no ventilation in the attic space, polyurethane foam would be used as insulation.