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Insulation is an essential component of any building and plays a vital role in maintaining energy efficiency and comfort. There are various types of insulation available on the market and fiberglass insulation is the most commonly used type of insulation due to its effectiveness, cost-efficiency, and ease of installation. While fiberglass insulation is non-flammable, there are parts of it that are not such as the backing so learning how to be safe is key.

In this posting, we will learn about fire safety factors to consider when using fiberglass insulation and highlight the health impacts related to it. Additionally, there are tips for staying safe with fiberglass insulation, including following manufacturer guidelines for proper installation, keeping insulation away from heat-producing devices, and seeking professional assistance when installing insulation in large areas or around complex structures.

Types of Insulation

There are numerous types of insulation available on the market, including:

  • Fiberglass
  • Cellulose
  • Foam board
  • Spray foam
  • Mineral wool
  • Natural fibers (cotton, sheep’s wool, etc.)

This overview will focus primarily on fiberglass insulation and its associated safety considerations.

Fiberglass insulation is cost efficient and easy to install as well as non-flammable.

What is Fiberglass Insulation?

Fiberglass insulation is made from fine glass fibers and is one of the most commonly used types of insulation. It’s favored for its effectiveness, cost-efficiency, and ease of installation. It can be found in batts, rolls, and loose-fill forms.

Fire Safety Factors to Consider

When considering insulation for any building, fire safety must be paramount. Understanding the flammability and reaction to fire of different materials is essential to ensuring the safety of occupants and the structure itself. Remember, safety and compliance with local building regulations should always be a top priority when selecting and installing insulation materials.

Is Fiberglass Insulation Flammable?

Fiberglass itself is non-flammable because glass has a high melting point. However, this does not mean that all fiberglass insulation products are completely fire-resistant. Often, fiberglass insulation is backed with kraft paper or foil. These backing materials can affect the overall fire resistance of the product. Kraft paper can burn, whereas foil-faced insulation acts as a better fire retardant.

How Does it Catch Fire?

While the fiberglass material does not catch fire easily, if exposed to intense heat over time, the backing materials can ignite. Additionally, improper installation near electrical fixtures or other heat sources can lead to heightened fire risk.

How to Stay Safe with Fiberglass Insulation

To ensure safety when using fiberglass insulation:

  • Follow manufacturer guidelines for proper installation.
  • Keep insulation away from heat producing devices or fixtures.
  • Ensure that all electrical wiring is properly insulated and conforms to code.

Many fiberglass insulation products contain added fire retardants to enhance their fire resistance. Common fire retardant chemicals used include borates and ammonium sulfate.

The thickness of insulation depends on where you live.

Health Impacts

Like any insulation material, there can be health concerns related to fiberglass insulation:

  1. Mold: If fiberglass insulation becomes wet, it can become a breeding ground for mold which can have negative effects on indoor air quality and health.
  2. Corrosion: Certain fire retardant chemicals can cause corrosion to pipes or electrical contacts if not properly installed or maintained.
  3. Toxicity: Inhalation of fiberglass particles can be irritating to the lungs, skin, and eyes, hence the need for protective gear during installation.

Other Maintenance

Now that you know about fiberglass insulation, let’s look at other areas of maintenance.

One of those is the amount of insulation you need in your home. It will range from 4 inches to 18 inches, depending on where you live. This is because some places and regions require more, while others need less.

Another is laying electrical wires over insulation. This is okay to do, especially if you have fiberglass insulation and will be safe. You can also lay the wires around the junction boxes as well.

Lastly, you also want to make sure that your home has a roof vent. This is because it allows air to flow in and out of the attic space and provides ventilation. While it is doing this, it helps keep out the mold.

When Do I Call a Professional?

Installing insulation often requires specialized knowledge to avoid potential risks. Professional assistance should be sought:

  • When installing in large areas or around complex structures.
  • If there’s any uncertainty about the correct material choice or installation methods.
  • To assess older insulation for replacement or additional fire-retardant needs.
  • If mold or water damage is observed in existing insulation.

Check out the video below about how fast the backing can burn on fiberglass insulation so you know about the risk.


Fiberglass insulation, while inherently non-flammable, does present certain risks if not handled correctly. By taking into account the type of backing, proper installation techniques, and the presence of fire retardants, homeowners and builders can greatly reduce the risk associated with insulation.

Remember, safety and compliance with local building regulations should always guide the selection and installation of insulation materials. While you are taking a look at your insulation or adding more to the home, it is a great time to reach out to American Property Inspections for a full home inspection in the Clermont, FL area.

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