Energy Blog

Choosing the Right Insulation: A Comprehensive Comparison Between Cellulose and Fiberglass

March 28, 2023

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In order to keep your home protected from the outside weather while also lowering your monthly energy bill, adding insulation is essential. If you’re planning on building a new home or are needing to replace insulation, it is important to know which type of insulation best fits your home’s needs. Two of the most common forms of insulation that are used in homes today are cellulose and fiberglass, both of which have their own set of advantages and disadvantages. To help you decide which type of insulation is best for your home, check out our comprehensive comparison guide below. 

What is Cellulose Insulation?

Cellulose insulation is a fiber insulation material that is able to conform to most spaces in your home without disturbing the finish or structure. Because it is made from ground-up recycled paper or denim, this type of insulation is great for homeowners who are wanting a more eco-friendly option. Cellulose insulation is heavily treated (typically around 15% by volume) with ammonium sulfate, borax, or boric acid. This treatment makes the insulation fire retardant, as well as help reduce any mold or pest issues. 

Cellulose insulation comes in three options: 

  • Loose-fill Cellulose
  • Dense-Pack Cellulose
  • Wet-Applied Spray Cellulose

Pros and Cons of Cellulose Insulation 

 Pros of Cellulose Insulation

  • Eco-friendly (contains more recycled material than other insulation options)
  • Inexpensive compared to other options (generally 75% lower costs than fiberglass)
  • Easy to install
  • Heat-resistant & high R-value
  • Resistant to pests, mold, & mildew
  • Fire-retardant
  • Associated with far fewer health risks than other forms of insulation, such as fiberglass

Cons of Cellulose Insulation 

  • Requires a vapor barrier
  • Although it is a cheaper option, installation costs can run higher than other types of insulation.
  • Generates a lot of dust during installation
  • Tends to absorb moisture easily, which can lead to issues such as reducing its long-term efficiency, mold, or rot
  • Dry-blown cellulose insulation sags and settles over time, reducing its R-value and its effectiveness
  • What is Fiberglass Insulation?


Fiberglass insulation is composed mainly of extremely fine glass fibers. It comes in both blanket form and in loose-fill form. Fiberglass insulation works as an insulator by trapping air and slowing the transfer of heat in your home. 

The thickness of fiberglass batts determines the resistance to heat flow (measured by the R-value). For walls, the R-value ranges from R11 to R19; whereas for ceilings and attics, the R-value can go up as high as R30. 

Pros and Cons of Fiberglass Insulation


 Pros of Fiberglass Insulation

  • Inexpensive, effective, & easy to install
  • Lower risk of developing moisture-related problems
  • Long lifespan, usually lasting up to 50 years
  • Eco-friendly option, as it is made from recycled glass
  • Fire-proof
  • Excellent sound-proofing qualities

 Cons of Fiberglass Insulation 

  • Loses R-value in extreme cold and temperature changes
  • Loses R-value when compressed or packed densely
  • Often comes pre-cut, which can make installing them a difficult task
  • Less dense and effective against air leaks
  • Improper self-installation can lead to health problems
  • If it gets wet, it will need to be professionally dried in order to work effectively.

Contact Reeves’ Insulation for All of Your Insulation Needs 


At Reeves Insulation we know that insulating your home is a big investment and we want to do what we can to make your home more energy efficient! Our team of professionals will be here to help guide you through the insulation process from start to finish. If you would like to know more information about which insulation is the best choice for your home’s unique needs or want to schedule services, call or contact our office today at 870-307-2373!


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Reeves Insulation has been in business, in the Batesville area, for over 30 years offering insulation, replacement windows, air sealing, and weatherization. Owner, Marvin Reeves started in the general contracting industry and his background has transferred over to Insulation and Home Energy Conservation, providing homeowners and businesses energy efficiency services to lower energy bills. Our business is family owned and operated and our goal is to provide you the best job at an affordable cost.