Cellulose insulation is primarily made from recycled paper products, usually newspaper, which is treated with non-toxic fire retardants like borate to enhance safety and pest resistance. 

Yes. Cellulose is one of the greenest insulation options available. It contains up to 85% recycled content and has a low embodied energy compared to other materials like fiberglass or foam. 

It can be installed as:

• Loose-fill/blown-in: Typically blown into attics or wall cavities using a machine. 
• Dense-pack: Blown into walls under pressure to prevent settling. 
• Spray-applied wet: A moist version used in new construction to adhere to cavities before drywall is installed. 

Cellulose typically has an R-value of about R-3.2 to R-3.8 per inch, which is comparable or better than fiberglass. It also provides better air sealing when dense-packed and offers excellent soundproofing. 

Yes. Despite being made from paper, cellulose insulation is treated with fire-retardant chemicals that give it a Class 1 fire rating.

Loose-fill cellulose may settle slightly, but modern dense-pack and stabilized methods minimize settling significantly. Proper installation is key to preventing issues. 

Yes. Cellulose insulation is denser than many other types and is very effective at reducing airborne sound transmission between rooms and floors.

Generally, yes. Cellulose is treated to resist mold, insects, and fire, and it doesn’t contain fiberglass particles that can irritate skin or lungs. Still, sensitive individuals should consult an expert.

If properly installed and kept dry, cellulose insulation can last 30 years or more without losing effectiveness.

Absolutely. Cellulose is often used in retrofits for older homes because it can be blown into existing walls without major renovations. 

Yes. The borate treatment used in cellulose acts as a deterrent to most insects and rodents. 

Cellulose is treated to resist mold, but like all insulation, it must be kept dry.