The Advantages of Cellulose Insulation

Cellulose insulation is a building material used to insulate homes and commercial structures. It is a loose-fill product made primarily from shredded newspaper, though some versions are made from cardboard or straw. While most insulation has traditionally been made from fiberglass, cellulose has been around for many years and was even used in Thomas Jefferson's Monticello.

Types

Cellulose insulation is available in four basic varieties. Loose-fill cellulose is a dry product and is the most widely used. Sprayed versions are similar to spray foam, and are made from shredded paper mixed with water and adhesives. Stabilized cellulose is moistened with water so that it will expand slightly. This allows a smaller amount of material to fill a larger space. Newer dust-free cellulose is treated with oil so that no dust is produced during installation.

Installation

Loose-fill products are typically blown into existing walls through small installation holes. Sprayed cellulose is installed into new, open wall cavities. The material is very rigid once it has been sprayed, so no forms or nets are required to hold it in place. Stabilized versions are often used in ceiling or roof spaces. Because it is slightly moist, less material can be used, which results in less weight and stress on the roof structure. Dustless cellulose can be installed in almost any application where dust is a concern.

Benefits

According to Energy Savers cellulose insulation has an R-value, or thermal resistance measurement, of 3.6 to 4.3 per inch. In comparison, traditional fiberglass batts have an R-value of just 2 to 3 per inch. Cellulose is also cheaper than fiberglass in many applications, and is highly resistant to fire. It is also very flexible, allowing it to fit around obstructions that would interfere with other types of insulation.

Drawbacks

This product also has several drawbacks that must be considered. It tends to settle over time, which can reduce its R-value. Cellulose also requires professional installation is most cases to ensure the correct amount of material is used. It has a lower R-value than rigid or spray foam insulation, and many varieties can produce irritating dust during the installation process.

Environmental Considerations

As the green building movement grows, the use of cellulose insulation has increased due to this material's many environmental benefits. Because it is a better insulator than fiberglass, it can be used to create a more energy efficient home. This is turn will reduce energy consumption, which will result in fewer carbon emissions. Cellulose is also beneficial because it is made primarily from post-consumer recycled products. Unlike foam insulation, cellulose does not contain CFC or HCFC gases that can deplete the ozone.

References

• Cellulose Insulation Manufacturers Association
• Advantages of Cellulose Insulation
• Energy Savers--Types of Insulation