When you install insulation in an existing closed wall or in an attic, it likely will be a loose-fill product called blow-in cellulose insulation. With an attic, this type of insulation is just one option along with the other popular alternatives, fiberglass batts or blown-in fiberglass. But with enclosed walls, blowing in loose-fill cellulose insulation is still by far the most practical and cost-effective method.
What is Cellulose Blown-In Insulation?
Cellulose insulation technically can come from any cellular plant source, such as corncobs or sisal. But commercial cellulose insulations are generally derived from wood, and more specifically from paper: recycled newspapers, cardboard, office paper, and other common waste paper products. For this reason, cellulose insulation is considered an eco-friendly home product.
How Does It Work?
The cellulose is blown into the attic/walls through a long, flexible tube that runs from the blower to the application nozzle.
The cellulose is allowed to fill the cavities or blanket existing insulation. No pressure is placed on the cellulose; it is allowed to settle over time.
Walls are patched up and painted over.