Technical Papers

Diving into the Product: Cellulose Insulation

Tuesday, July 26th, 2022 by Carolann Eddington

DIVING INTO THE PRODUCT

CELLULOSE INSULATION

When we install insulation in an attic, it will be loose-fill blow-in cellulose insulation. With an attic, this type of insulation is the best option because it's the most practical and cost-effective method.

What Is Loose-Fill Cellulose Insulation?

Cellulose insulation is thick, dense, and clumpy, with a consistency much like down feathers. The value of this, is that the insulation can fit in enclosed areas and can conform to obstructions such as wires and ducts. 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 Cellulose Insulation Is Blown into Your Attic

Diving into the Product: Cellulose Insulation - Image 1

Densely packed bales of cellulose are fed into the hopper of an insulation blower powered by an electric motor. Rotating teeth or prongs at the bottom of the hopper fluff up the cellulose.

  • The cellulose is blown into the attic through long flexible tubes that run from the blower to an application nozzle.
  • The cellulose is allowed to fill the cavities and blanket the attic floor. Loose-fill cellulose insulation can settle around and conform to most of the obstructions found in attics.
  •       Loose-fill cellulose is relatively inexpensive, yet still has an R-value of about 3.5 per inch of thickness, compared to fiberglass' R-value between 2.2 to 2.7 per inch.
  •       Cellulose insulation stands up well against insects and vermin because it is treated with borates.

Is Blown Cellulose Insulation a Fire Hazard?

While cellulose insulation's paper in its raw state is combustible, during manufacturing, cellulose insulation is treated with borates, which are Class I fire retardants. Class I refers to ordinary combustibles such as wood and paper, as opposed to Class II combustibles, such as flammable liquids, grease, gasoline, oil, etc. As a demonstration of cellulose insulation's fire-retarding capacity, it is possible to use a blowtorch to warp a penny resting on a bed of cellulose insulation held in your hand. Not only does the cellulose remain unaffected even while the penny begins to melt, but the insulating value of the cellulose is such that no heat is felt by the hand holding the experiment.

 

For more information and to receive a free inspection and estimate, contact us today! 1-503-873-5650

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