Cellulose Insulation:
The All-in-One Insulation Solution

Cellulose insulation is made of recycled paper products, primarily newsprint, treated with fire-retardant chemicals like boric acid. The paper is ground into a fibrous material that traps air, providing thermal resistance. This eco-friendly insulation is commonly used in walls and attics for energy efficiency.

Cellulose insulation is made of recycled paper products, primarily newsprint, treated with fire-retardant chemicals like boric acid. The paper is ground into a fibrous material that traps air, providing thermal resistance. This eco-friendly insulation is commonly used in walls and attics for energy efficiency.

Cellulose insulation can get moldy if it stays wet for an extended period. While it is treated with mold inhibitors, prolonged moisture can still support mold growth. Proper ventilation and moisture control are essential to prevent mold in cellulose insulation.

Cellulose insulation can be used in old homes with plaster walls by installing it through small holes drilled into the wall cavities. This method, known as drill-and-fill, allows dense-pack cellulose to fill gaps without removing plaster, improving energy efficiency while preserving the original wall structure.

Cellulose insulation is generally safe for people with allergies because it is made from recycled paper and treated with non-toxic additives like borates, which resist mold and pests. However, during installation, dust may cause irritation, so wearing protective gear is recommended.

The main difference between cellulose and spray foam is that cellulose is made from recycled paper and offers good thermal performance at a lower cost, while spray foam provides a higher R-value per inch and acts as an air barrier. Spray foam is more expensive but seals better against drafts.

Cellulose insulation can settle over time, especially if not densely packed during installation. Settling reduces coverage and creates air gaps, which lower thermal performance. Proper installation using dense-pack techniques minimizes settling and helps maintain effectiveness over the life of the insulation.

Cellulose insulation is generally less expensive than fiberglass. It offers comparable thermal performance at a lower cost, especially for retrofitting older homes. While installation methods differ, cellulose is often more cost-effective due to its recycled content and ease of application.

Cellulose insulation does not attract mice despite being made of paper because it is treated with borates, which act as a pest deterrent. While no insulation is completely rodent-proof, the chemicals used in cellulose make it less appealing for nesting compared to untreated materials.

Yes, cellulose can be used effectively in both ceilings and floors as an insulation material.

In Connecticut, cellulose insulation should be a minimum of 10–11 inches thick to meet the building code requirement of R-38 and 14 inches thick for R-49, which is recommended for better efficiency and comfort. Always measure thickness after settling and check local codes for specific requirements.