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Is Fiberglass Insulation Flammable?

Aug 28, 2023

As an insulation installation and replacement company, we understand that safety is a top concern for our customers. One common question we often encounter is, "Is fiberglass insulation flammable?"


 In this blog post, Insulation Pros will answer this question and provide you with valuable insights into the fire safety aspects of fiberglass insulation. Let's explore how fiberglass insulation works, its flammability characteristics, and measures to enhance fire safety.

Close-up of strips of pink fiberglass insulation in a wall of a new building.

How Fiberglass Insulation Works

Before we examine its flammability, let's first help you understand how fiberglass insulation works. Fiberglass insulation is made from tiny glass fibers that are tightly packed together. This design creates air pockets within the material, which helps to slow down the transfer of heat. By minimizing heat transfer, fiberglass insulation effectively improves energy efficiency, making it a popular choice for both residential and commercial buildings.

Is Fiberglass Insulation Flammable?

One of the most common misconceptions about fiberglass insulation is that it is highly flammable. When in actuality, fiberglass insulation is not easily flammable. It is designed to be fire-resistant and offers adequate protection against potential fires.


Manufacturers subject fiberglass insulation to rigorous fire-resistance testing, which assigns it a specific fire safety rating. These ratings indicate how well the insulation resists ignition and slows down the spread of flames in case of a fire incident. When installed correctly and used in compliance with fire safety regulations, fiberglass insulation can be a safe and effective choice for your insulation needs.

Factors Affecting the Flammability of Fiberglass Insulation

The flammability of fiberglass insulation can be influenced by various factors, including the installation process, insulation density, and thickness. Proper installation is crucial for maintaining fire safety. When insulation is improperly installed with gaps or compressed too tightly, it can compromise its fire-resistant properties.


The density and thickness of the fiberglass insulation also play a significant role in determining its fire resistance. Higher-density insulation generally provides better fire protection due to increased material mass, which slows down heat transfer and limits the spread of flames.


Different areas of your building or home may require varying fire safety measures. For example, attics and basements may present specific challenges that need to be addressed to enhance fire safety.

Fire Safety Standards and Regulations

When selecting any insulation material, including fiberglass insulation, it is essential to adhere to fire safety standards and regulations. Reputable insulation manufacturers ensure their products meet or exceed these standards to guarantee fire safety. Always choose certified and tested insulation materials to minimize potential fire risks and ensure the well-being of occupants.


Make sure to familiarize yourself with local fire codes and regulations, as they may dictate specific requirements for insulation materials in your region.


For more peace of mind, some fiberglass insulation products come with fire-retardant treatments or additives. These treatments can further enhance the fire resistance of the insulation, making it more effective in the event of a fire. It is advisable to consult with professionals to understand the available fire-retardant options for your insulation needs and choose the most suitable one for your project.

Tips for Enhancing Fire Safety with Fiberglass Insulation

To maximize fire safety with fiberglass insulation, make sure to follow these tips:


  • Proper Installation: Ensure that the insulation is installed correctly, without gaps or compression, to maintain its fire-resistant properties.
  • Regular Maintenance: Inspect your insulation regularly to identify any damage or degradation that might affect its fire resistance. Promptly replace any compromised insulation.
  • Integrate Fire Barriers: In specific areas, such as near electrical components, consider adding fire barriers to enhance overall fire safety.


All of these tips and more will be addressed by a professional insulation company. This way you can feel more confident in your insulation, rather than leaning on a DIY-approach.

FAQs On Fiberglass Insulation & Fire Safety

  • Can fiberglass insulation catch fire?

    While fiberglass insulation is not entirely fireproof, it is designed to be fire-resistant and slow down the spread of flames.

  • Is fiberglass insulation safer than other insulation materials?

    Fiberglass insulation is considered a safe option when installed correctly and used in compliance with fire safety regulations. However, each insulation material has its own advantages and considerations regarding fire safety.

  • Is fiberglass insulation toxic when exposed to fire?

    When exposed to fire, fiberglass insulation may emit smoke and fumes like any other burning material. However, fiberglass is generally considered non-toxic and does not produce harmful gases when burning. Nevertheless, it is essential to evacuate the building in case of a fire and allow firefighters to handle the situation.

  • Can I install fiberglass insulation myself to ensure fire safety?

    While some homeowners may attempt DIY insulation installation, it is crucial to understand that proper installation, especially concerning fire safety, requires expertise and knowledge. We recommend consulting a professional insulation installation company to ensure the insulation is correctly and safely installed, reducing the risk of fire hazards.

Contact The Pros For Fiberglass Insulation Installation Or Removal

It can be said that fiberglass insulation is not flammable in the sense that it readily catches fire. When properly installed and used in accordance with fire safety standards, fiberglass insulation is a reliable and safe choice for your insulation needs. Understanding its fire-resistant properties and adhering to installation best practices are key to maximizing fire safety.


If you have any more questions about fiberglass insulation or need professional insulation installation  or removal services, don't hesitate to contact Insulation Pros. Your safety and satisfaction are our top priorities!

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