What is Cellulose Insulation?
Cellulose is a fiber insulation used in enclosed existing walls, open new walls, and unfinished attic floors. Typically made from recycled newsprint, it forms an insulation material that conforms to most spaces without disrupting the structure.
Composition of Cellulose Insulation:
Modern cellulose insulation is primarily composed of 75 to 85 percent recycled paper or denim, treated with around 15 percent boric acid, borax, or ammonium sulfate for flame retardancy and pest resistance. Wet-applied cellulose involves adding water during installation.
Working Mechanism of Cellulose Insulation:
Cellulose insulation can be applied as loose-fill in attic cavities, dense-packed into walls and floors, or wet-sprayed in new construction to enhance heat retention and reduce noise levels. It offers both thermal insulation and soundproofing properties.
R-Value of Cellulose Insulation:
The R-Value, indicating insulation material’s resistance to heat flow, ranges between R-3.1 and R-3.8 per inch for loose-fill cellulose. However, the actual R-Value depends on the manufacturer and climate zone.
Pros and Cons of Cellulose Insulation: Pros:
- High recycled material content
- Environmentally friendly production process
- Effective at filling gaps and cavities
- Cost-effective option
- Provides resistance to mold, pests, and fire
Cons:
- Settling issues, up to 20 percent in modern cellulose
- Susceptibility to moisture absorption and slow drying
- Potential for dust circulation, especially in homes with duct systems
- Heavy weight compared to fiberglass
- Installation challenges and potential messiness
Installation Process: Cellulose insulation can be installed by blowing it in using a machine, drilling holes in wall cavities for retrofitting, or damp-spraying for new construction.
Impact on Energy Costs: While cellulose insulation offers resistance to heat transfer, it may not effectively prevent airflow, contributing to discomfort and energy loss. Improper insulation can lead to constant operation of heating and cooling systems, increasing energy consumption.
Understanding cellulose insulation and its application can help homeowners make informed decisions regarding their insulation needs, considering both the benefits and limitations of this traditional insulation material.
