Is Spray Foam Insulation Better Than Fiberglass?

When insulating your home, it’s important to look at all your options. An expert can help you evaluate what type of insulation will be best for your space, depending on cost, permeability, and environment. Fiberglass is a popular insulation material amongst homeowners; however, there are many factors to consider when comparing it against spray foam insulation. Let’s take a look:


What is Fiberglass Insulation?

Fiberglass insulation is made up of tiny glass “fibers”. Larger pieces of glass are melted and spun into small particles (fibers) which are then put together to form fiberglass insulation.

Cost of Fiberglass

Fiberglass is typically charged based on the number of square feet needed to insulate. Homeowners find this a less expensive option but the effectiveness of the materials needs to be considered as well. What may last for a couple of years will then need to be replaced because fiberglass does not have a true air seal, thus allowing the breakdown of fiberglass insulation to happen quicker than other materials. The cost of replacing fiberglass should be considered when choosing this insulation material for your home. 

Longevity of Fiberglass

You should expect fiberglass insulation to maintain its durability for several years. While other materials may last longer, the cost of fiberglass is reflected in its lifespan. It’s a good option if you’re not needing a solution for longer than a few years or if a home insulation expert notes fiberglass is better suited for your space.

R-Value of Fiberglass

Because fiberglass insulation is made up of small particles, there is room for air and moisture to pass through—it doesn’t have a complete seal. This lowers the R-Value, for a rating of less than 3 per square inch.


What is Spray Foam Insulation?

Spray foam insulation is a chemical product that expands when activated to serve as an air and moisture barrier for home insulation.

Cost of Spray Foam

Spray foam insulation is charged per board foot used. Because spray foam insulation is highly effective, blocking air, moisture, and sound, it costs more than other types of insulation. However, homeowners find it as a solution to their insulation problems and well worth the cost.

Longevity of Spray Foam

When installed correctly, spray foam can last upwards of 70+ years—it’s a lifetime investment! It requires little to no maintenance and the material does not break down quickly over time. Spray foam insulation is able to hold up against strong air drafts and humid climates, making it a great home insulation choice for North Carolinians.

R-Value of Spray Foam

There are two types of spray foam, with slightly different R-Values. Closed-cell spray foam and open-cell spray foam each have varying permeabilities but the strength of the materials to insulate ranges between 3.5 to 6.5 per square inch.


Overall, we recommend having an insulation expert come and evaluate your home to determine which type of insulation material will be the best fit for your space. Our team members at MPI Foam are ready and available to assist with spray foam insulation in your home. Give us a call to schedule an appointment today!

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