What is fiberglass insulation? Person installing attic insulation.

What is fiberglass insulation? and Is Fiberglass Insulation Right for Your Attic?

If you’re a homeowner in the United States, there’s a good chance you have fiberglass insulation in your attic. But what is fiberglass insulation, exactly? Is it doing its job well, or is it time for an upgrade? In this blog post, we’ll break down fiberglass insulation – exploring its pros, cons, and whether it’s the best choice for keeping your home comfortable and energy-efficient.

What is fiberglass insulation exactly?

Let’s start with the basics. Fiberglass insulation is made from tiny strands of glass spun into fluffy, flexible material. Picture a very fine version of cotton candy. These glass fibers create thousands of small air pockets, which are fantastic at trapping heat. This helps to slow the transfer of heat into and out of your home.

Types of Fiberglass Insulation

You’ll usually find fiberglass insulation in two main forms:

  • Batts and Rolls: These are pre-cut sections designed to fit between the framing in your attic, walls, and floors. They often come with a paper or foil backing that helps control moisture.
  • Loose-fill: This type of fiberglass is blown into spaces using special equipment, making it ideal for attics and other hard-to-reach spots.

Benefits of Fiberglass Insulation

Fiberglass has become a popular insulation choice for several good reasons:

  • Cost-effective: It’s one of the most affordable insulation options on the market.
  • Energy Savings: Fiberglass does a good job of reducing heat flow, which means lower heating and cooling bills.
  • Sound reduction: Those same air pockets also dampen noise, creating a quieter home environment.
  • DIY potential: If you’re handy, installing fiberglass batts can be a manageable project.

Considerations Before Choosing Fiberglass

Fiberglass isn’t without its drawbacks:

  • Safety concerns: The tiny glass fibers can be irritating. Wear protective gear like gloves, masks, and long sleeves during installation.
  • Moisture problems: If fiberglass gets wet, it loses its effectiveness and can even promote mold. Proper installation and vapor barriers are crucial.
  • Diminishing returns: Fiberglass can settle over time, reducing its insulating power (R-value).

Is Fiberglass Right for You?

Fiberglass can be a good choice for attic insulation, especially if you’re on a budget. However, it’s important to consider your specific climate and needs. In areas with high humidity, or if you’re particularly concerned about long-term performance and safety, other insulation types like spray foam or cellulose might be a better fit.

Key Takeaways

  • Fiberglass insulation is a budget-friendly way to reduce energy costs and improve comfort.
  • Proper installation is key to prevent moisture issues and maximize effectiveness.
  • Fiberglass may not be the best choice in all climates and situations.



Choosing the right attic insulation is an important investment in your home. If you have questions or you’d like to discuss having your existing insulation evaluated, give us a call! Our experts can help you determine if fiberglass is the best solution for your needs or if a different type of insulation would be more beneficial for your home.

Disclaimer: This blog post is for informational purposes only. Always consult a qualified insulation professional before making decisions about your attic insulation.