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Fiberglass vs. Spray Foam Insulation: Which Is a Better Thermal Insulation Option?


Having the right insulation in your home is crucial in ensuring that you and your family stay warm in winter and cool during the summer. There are different ways to insulate your home, but two of the common types are fiberglass insulation and spray foam insulation. What’s best for you? Read through this blog to find out.

Spray foam insulation is an insulation type that is sprayed onto a surface to provide a thermal barrier. It is made up from two ingredients: polyurethane and isocyanate. When these two ingredients combine, they create a chemical reaction that causes the foam to expand and harden.

This process allows the foam to fill in any gaps or cracks on the surface, creating a tight seal that helps to keep heat in and cold out.

Spray foam insulation is an effective way to insulate your home because it provides a continuous barrier against heat transfer. Unlike fiberglass insulation, which can leave gaps and allow air to leak through, spray foam creates a tight seal that helps to prevent heat loss.

Why Is It Better Than Fiberglass Insulation?

For several reasons, spray foam insulation is a better thermal insulation option than fiberglass insulation.

Air and Moisture Leakage Prevention

Spray foam insulation is more effective at sealing air leaks and preventing moisture infiltration than fiberglass insulation. This helps to improve your home’s energy efficiency by keeping warm air in during winter and cool air in during summer.

Long Lasting

Spray foam insulation is less likely to settle over time, maintaining its insulating properties over the life of your home. This can save money in the long run, as you won’t need to keep buying new insulation materials every few years.

Excellent Insulator 

Spray foam insulation has a very high R-value, which means it does an excellent job trapping heat inside your home. This can help to keep your energy bills down, as you won’t need to use as much heating and cooling to maintain a comfortable temperature.

Environmentally Friendly

Spray foam insulation is made from renewable resources, so it doesn’t strain the environment. Additionally, it doesn’t contain harmful chemicals or pollutants, making it a safe choice for families.

Fire Protection

Most foams used in construction products are considered flammable. However, the materials used in spray foams and coatings have a Class 1 hour rating. This ensures that no matter what happens in a building, these products will prevent any fire from spreading.

Absence of Formaldehyde

Fiberglass insulation contains a chemical named formaldehyde which is absent in spray foams, making it safer to use in homes.

Safe from Critters

Spray Foam insulation is ideal for protecting your home against pest infestation and protects nearly any type of building material against rodents. Even a rat or mouse would have trouble nesting in a spray foam insulation, which will help your insulation last longer.

Sound Proof

Spray foam insulation provides a measure of soundproofing to your structure.

Safe From Condensation 

Spray foam insulation helps prevent moisture from accumulating, which leads to another benefit, i.e., the controllable temperature in your home.

Fortified Structures

Stronger walls, better heat retention. One of the great benefits of applying spray foam insulation over other types of insulation is reinforcement. It provides your wall with a firmer structure, making it less likely to fail when faced with extreme weather or natural disasters.

How Much Does Spray Foam Insulation Cost?

The cost of spray foam insulation may depend on the size of the insulated area and the foam’s type and thickness. For a small area, such as a single room, the cost can be as low as $500. The cost can be several thousand dollars for a large area, e.g., an entire house. The type of spray foam insulation will also affect the cost.


While both types of insulation have pros and cons, we believe spray foam insulation is the better option overall. Spray foam insulation is more effective at sealing gaps and cracks, which means that it will be more effective at keeping your home warm in the winter and cool in the summer.

If you are looking for the finest quality spray foam insulation, contact Air Seal Insulation Systems at (718) 821-6800 and get them now!

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