Common Myths About Blown-In Cellulose Insulation

Blown-in cellulose insulation is one of the most effective and environmentally friendly options for improving home energy efficiency. Despite its proven benefits, many homeowners still have misconceptions about its safety, durability, and performance compared to other insulation materials. These myths can lead to unnecessary hesitation when considering cellulose insulation for attics, walls, and other areas of the home.

At Rogers Insulation, we specialize in blown-in cellulose insulation, attic insulation, and air sealing to help homeowners reduce energy costs and increase comfort. As a Mass Save Partner, we also offer free home energy assessments to ensure you get the best solutions for your home. Contact us today to schedule yours!

Myth #1: Blown-In Cellulose is a Fire Hazard

A common misconception is that because cellulose insulation is made from recycled paper, it must be flammable. In reality, modern cellulose insulation is one of the most fire-resistant insulation materials available. During manufacturing, cellulose is treated with borate-based fire retardants, which significantly reduce its combustibility.

Unlike untreated materials, cellulose chars rather than ignites when exposed to flames. This charring effect creates a protective barrier, slowing the spread of fire. Industry tests have shown that cellulose insulation actually performs better than fiberglass in fire resistance because it lacks the air pockets that can fuel flames.

Myth #2: Cellulose Insulation Settles Too Much and Loses Effectiveness Over Time

All loose-fill insulation settles slightly over time, but properly installed cellulose insulation maintains its insulating power. Professional installers like Rogers Insulation account for natural settling by overfilling the material, ensuring it retains its intended R-value.

In wall cavities, dense-pack cellulose is even more effective because it compacts tightly, preventing air infiltration. In contrast, fiberglass batts can leave gaps and fail to completely seal an area, reducing insulation effectiveness. Homeowners who choose blown-in cellulose benefit from long-term, consistent energy efficiency without worrying about performance degradation.

Myth #3: Cellulose is More Prone to Moisture Damage Than Other Insulation Types

Some homeowners believe that cellulose absorbs excessive moisture and is more susceptible to mold growth than fiberglass or spray foam. The truth is that cellulose is hygroscopic, meaning it can absorb and release moisture without losing its insulating properties. This helps prevent the accumulation of water that can lead to mold problems.

Fiberglass, on the other hand, can trap moisture inside air pockets, leading to long-term dampness and potential mold growth. Proper installation techniques—such as air sealing and maintaining good ventilation—help ensure that cellulose insulation remains dry and effective for years to come.

Myth #4: Fiberglass or Spray Foam is Always a Better Insulation Option

While fiberglass and spray foam are common insulation materials, they are not always the best choice compared to blown-in cellulose. Cellulose has a higher R-value per inch than fiberglass, meaning it provides better thermal resistance for the same thickness. It also fills gaps and crevices more completely, reducing air leaks and improving overall home efficiency.

Spray foam insulation does offer high R-values, but it comes with a significantly higher cost and potential off-gassing concerns from the chemicals used in its application. For most homeowners, blown-in cellulose provides the best balance of affordability, performance, and environmental benefits, making it an excellent choice for both attics and walls.

Myth #5: Cellulose Insulation is Not Environmentally Friendly

Some believe that cellulose insulation is not as sustainable as other materials, but in reality, it is one of the most environmentally friendly insulation options available. Made from 80-85% recycled newspaper, cellulose helps divert waste from landfills while reducing the demand for new raw materials.

Compared to fiberglass, which requires a high-energy manufacturing process, or spray foam, which relies on petroleum-based chemicals, cellulose has a much lower carbon footprint. Homeowners looking for a sustainable insulation solution will find that cellulose insulation aligns well with their eco-friendly goals.

Myth #6: Blown-In Cellulose Attracts Insects and Rodents

Some homeowners worry that because blown-in cellulose is made from recycled paper, it might attract pests like insects and rodents looking for nesting material. However, this is a misconception—properly treated cellulose insulation is actually a deterrent to pests rather than an attractant.

Cellulose insulation is treated with borates, which are natural mineral compounds that act as an insecticide and fungicide. Borates repel common household pests such as ants, cockroaches, and termites, making cellulose insulation far less appealing to insects than traditional fiberglass or organic materials like straw. Additionally, rodents do not find cellulose insulation an attractive nesting material, especially when it is densely packed in walls and attics.

For homeowners concerned about pest control, cellulose insulation can actually provide an added layer of defense while improving home energy efficiency.

Myth #7: Blown-In Cellulose Creates a Lot of Dust in the Home

Since cellulose insulation is made from finely shredded recycled newspaper, some homeowners assume that it will generate dust and impact indoor air quality. In reality, cellulose insulation is designed to be installed in a controlled manner, with minimal airborne particles escaping into living spaces.

During installation, professional contractors use specialized blowing equipment that directs the material precisely where it is needed. In wall cavities, dense-pack cellulose creates an airtight barrier, preventing insulation dust from escaping into the home. For attic installations, access points are properly sealed to prevent loose fibers from entering air circulation.

Compared to fiberglass, which can release tiny airborne glass fibers that irritate the skin and lungs, cellulose insulation is actually safer for indoor air quality. Once installed, cellulose remains contained within the building envelope, contributing to a well-sealed and energy-efficient home.

Myth #8: Blown-In Cellulose Loses Effectiveness in Cold Climates

A common belief is that cellulose insulation loses its ability to insulate in extremely cold temperatures, making it less effective for New England homes. However, cellulose actually outperforms fiberglass insulation in cold climates because it is denser and reduces air movement within the insulation layer.

Fiberglass insulation can experience a phenomenon known as convective looping—as temperatures drop, air can circulate inside the insulation, reducing its effectiveness. In contrast, cellulose prevents this air movement, maintaining its insulating power even in frigid conditions.

There are many misconceptions about blown-in cellulose insulation, but the facts tell a different story. This insulation is fire-resistant, pest-resistant, and highly effective in cold climates, making it an excellent choice for both attics and walls. It does not attract insects, does not create dust issues, and maintains its performance better than many other insulation materials.

If you’re considering an insulation upgrade, don’t let misinformation hold you back. Contact Rogers Insulation today for a free home energy assessment and learn how blown-in cellulose can help reduce your energy costs and enhance your home’s comfort.