Dense packing is the method Foam It uses to insulate the walls of a home. The walls of this home in Endicott, NY had zero insulation in them. The Foam It team carefully removed the vinyl siding, allowing for holes to be cored. Once the holes were made they began the insulating process by inserting a hose up the wall cavity and tightly filling it with cellulose insulation. They do this process until the entire cavity is jam packed. They then seal the hole with one part foam before putting the siding back on.