heating and AC, plumbing & electric
Thank you for considering Paschal Air, Plumbing & Electric as your service provider. We are proud to serve Arkansas & Missouri for more than 50+ years. You can rest easy because whatever your air, plumbing or electrical needs may be – there’s nothing we can’t handle. It’s our passion and it’s our promise to you, one that we proudly stand behind. Avoid the hassle – go with Paschal!


Before we visit your home to walk you through the Paschal Process, please take a few moments to watch this short informational video, and to answer a few questions so that we can better serve you.


heating and AC, plumbing & electric 479.900.0784
June 19, 2023

Blown in Attic Insulation: Cellulose vs Fiberglass

Insulation is a critical part of a home that often goes overlooked. It’s an unseen guardian, protecting your home from extreme weather conditions, reducing noise, and even saving you considerable sums of money on energy bills. Among the various types of insulation available in the market, two of the most common choices for attic insulation are Cellulose and Fiberglass. In this comprehensive guide, we’ll delve into the intricate details of both types and aid you in making an informed decision for your home.

Before we delve into the cellulose versus fiberglass debate, it’s essential to grasp why insulation is so important for homeowners. Insulation, particularly in your attic, keeps your home comfortable and energy-efficient. It acts as a barrier, reducing heat transfer between your house and the outside world, keeping you warm in the winter and cool in the summer.

Not only does this mean a more comfortable living environment, but it also leads to less energy consumption and lower utility bills.

With the right insulation, you can save up to 15% on heating and cooling costs, according to the U.S. Department of Energy. However, not all insulation is created equal, and this is where the cellulose vs. fiberglass debate comes into play.

STOCK INTERNAL blowing insulation money scaled

Understanding Attic Insulation

Attic insulation is a thermal barrier that blocks the transfer of heat between the attic and the living spaces below. The better your insulation, the less heat you lose in the winter and gain in the summer. This reduces the load on your HVAC system and saves energy.

Insulation effectiveness is measured in R-values — the capacity of an insulating material to resist heat flow. The higher the R-value, the greater the insulating power. The Department of Energy recommends an R-value of R-30 to R-60 for attics in most climates.

What is Cellulose Insulation?

Cellulose insulation is a type of loose-fill insulation made from recycled paper products, primarily newspaper. The paper is treated with chemicals to make it fire-resistant and suitable for home insulation.

Screen Shot 2015 04 30 at 11.42.28 PM 752x376 1

Advantages of Cellulose Insulation

  • Eco-Friendly: Being made from recycled paper, cellulose insulation is an environmentally-friendly choice. Its production also uses less energy than fiberglass insulation.
  • Superior Thermal Performance: Cellulose insulation has a higher R-value per inch than fiberglass, providing better thermal resistance.
  • Sound Insulation: Cellulose also provides excellent sound insulation due to its density, making your home quieter.
  • Fits Irregular Shapes: As a loose-fill material, cellulose can fit around pipes, wires, and other obstacles in your attic, ensuring complete coverage.

Disadvantages of Cellulose Insulation

  • Moisture Absorption: Cellulose can absorb water, which can lead to mold growth and a reduction in insulating power.
  • Settling Over Time: Over time, cellulose can settle and compress, reducing its effectiveness.

What is Fiberglass Insulation?

Fiberglass insulation is made from tiny fibers of glass woven together. It’s available in two forms: as pre-cut batts and as a loose-fill material that can be blown into attics.

size insulation for 2x4 and 2x6 walls 182159 recirc 40c0c813d53a491d9c0fdeeed315f260

Advantages of Fiberglass Insulation

  • Lower Cost: Fiberglass insulation is typically less expensive than cellulose.
  • Moisture Resistance: Fiberglass does not absorb water, making it a good choice in areas with high humidity.
  • Long-Lasting: Fiberglass does not settle or degrade over time, maintaining its insulating power.

Disadvantages of Fiberglass Insulation

  • Lower R-Value per Inch: Fiberglass has a lower R-value per inch than cellulose, meaning you may need more of it to achieve the same insulation level.
  • Can Leave Gaps: Because it’s less dense than cellulose, fiberglass may not fill all the nooks and crannies in your attic, leading to potential heat loss.

Cellulose vs Fiberglass: A Detailed Comparison

1. Environmental Impact

While both cellulose and fiberglass are eco-friendly options, cellulose takes the lead as it is composed of about 85% recycled materials. In contrast, fiberglass contains around 20-30% recycled content. The production of cellulose insulation also consumes less energy than that of fiberglass.

2. R-Value and Energy Efficiency

Both cellulose and fiberglass are energy-efficient insulation materials, but cellulose has a slight edge due to its higher R-value. The R-value for cellulose insulation is approximately 3.2 to 3.8 per inch, while fiberglass insulation typically has an R-value of 2.2 to 2.7 per inch. This higher R-value means cellulose insulation can provide the same level of insulation as fiberglass but in a thinner layer.

P1 P12 EnergyStar HowMuchDoINeed1

3. Cost and Installation

Fiberglass insulation is generally less expensive than cellulose, both in terms of material and installation costs. However, the total cost also depends on the size and complexity of the area being insulated.

4. Fire Safety

Both types of insulation are treated with fire retardants to enhance their fire resistance. However, cellulose insulation is often considered safer in the event of a fire as it chars rather than burns, while fiberglass can melt when exposed to extreme heat.

5. Moisture Control

In any home, ensuring proper moisture control and ventilation in your attic space is pivotal. Regardless of whether you choose cellulose or fiberglass, persistent moisture or exposure to water can be detrimental to the performance and longevity of the insulation material.

Cellulose has the potential to absorb some moisture, but it can also dry out without losing its insulating power, provided the source of the moisture is appropriately addressed. On the other hand, while fiberglass is less likely to absorb moisture, it can still suffer from mold and mildew growth when exposed to persistent dampness or standing water.

Thus, the critical factor here isn’t the insulation material itself, but rather the effectiveness of your home’s moisture control measures. Ensuring your attic space has adequate ventilation, combined with effective moisture barriers and timely maintenance, is essential for the health of both your insulation and your home’s overall structure.

Under properly controlled conditions, cellulose insulation continues to provide superior thermal performance and environmentally-friendly benefits, making it an excellent choice for homeowners prioritizing energy efficiency and sustainability

6. Pest Resistance

Cellulose insulation is typically treated with borates, which have pest-resistant properties. This can be beneficial in regions prone to insect infestations.

Installing Blown-in Insulation: The Procedure

28cd6126 ae9b 4c18 b366 2f781a24b0ae

Whether you’re considering cellulose or fiberglass insulation, the process of blown-in insulation is essentially the same. Professionals use a specialized machine to blow the insulation into the attic space. Here’s a brief rundown of the procedure:

  • Preparation: The first step is to prepare your attic space. This could involve inspecting any existing insulation and determining whether it’s in good enough condition to stay. It’s worth noting that blown-in insulation, be it cellulose or fiberglass, can often be added on top of your current insulation to boost its effectiveness, provided the existing material is dry and in reasonable condition. However, any insulation in poor condition or showing signs of moisture damage may need to be removed. Vents, pipes, and other elements must be covered to prevent insulation from getting into unwanted places, ensuring a clean and efficient installation process.
  • Machine Setup: The insulation blowing machine is set up, usually in the yard or driveway, and a long hose is run to the attic space.
  • Blowing Insulation: The insulation is loaded into the machine, which then breaks it up and blows it through the hose into the attic.
  • Adjustment: As the insulation is blown in, the technician adjusts the spread of insulation to ensure even coverage throughout the space.

Remember that this process should be left to professionals to ensure a proper and safe installation.


  • Q1: Which insulation is better: cellulose or fiberglass? There’s no definitive answer to this question. The best insulation depends on your specific needs, budget, and the climate in your area. Both cellulose and fiberglass have their pros and cons, and understanding these will help you make an informed decision.
  • Q2: Is cellulose insulation safe? Yes, cellulose insulation is safe. It is treated with fire retardants to increase its fire resistance and borates to resist pests. It’s also an environmentally-friendly choice due to its high recycled content.
  • Q3: Can cellulose insulation get wet? While cellulose insulation can absorb moisture, it can dry out without losing its insulating power, as long as the source of the moisture is addressed. However, consistent or substantial moisture exposure can lead to mold and mildew growth.
  • Q4: Can I install blown-in insulation myself? While it’s technically possible, it’s generally not recommended for homeowners to install blown-in insulation themselves. The process requires specialized equipment and expertise to ensure even and adequate coverage. Incorrect installation can lead to gaps in insulation, reducing its effectiveness.

MicrosoftTeams image 1

Call the Professionals

Choosing the right insulation for your home is a critical decision that can significantly impact your home’s comfort and energy efficiency. Both cellulose and fiberglass insulation have their merits and drawbacks. However, for those prioritizing eco-friendliness, superior thermal performance, and excellent sound insulation, blown-in cellulose insulation is a compelling choice.

At Paschal Air, Plumbing & Electric, we are experts in installing blown-in cellulose insulation, providing you with superior service and guaranteeing an increase in your home’s comfort and energy efficiency. Remember, insulation is not a DIY project – it requires the precision and expertise of trained professionals.

Ready to enhance your home’s comfort and save on energy bills? Schedule your next appointment with the Professionals at Paschal today! Our experienced team is ready to evaluate your home’s needs and provide the best insulation solution for you. Your comfort is our priority.