Spray Foam Insulation vs Fiberglass: A Comparison

When it comes to insulation materials for your home or business, there are a variety of options available. However, two of the most popular options are spray foam insulation and fiberglass insulation. While both can effectively insulate your property, they have distinct differences in terms of installation, energy efficiency, durability, and cost. Lets take a closer look at the pros and cons of each type of insulation to help you make an informed decision.


One of the biggest differences between installing spray foam insulation and installing fiberglass insulation is the installation process. Spray foam insulation is applied as a liquid, which expands and hardens to form a tight seal. This means it can be sprayed directly into walls, ceilings, and floors, filling every gap and crevice.

On the other hand, fiberglass insulation is installed as batts or rolls. These batts or rolls are cut to fit the space and then placed between studs, joists, or rafters. This makes installation more time consuming and requires careful measuring and cutting to ensure a proper fit.

Energy Efficiency

Both spray foam insulation and fiberglass insulation can improve your utility bill by reducing heat transfer and air infiltration. However, spray foam insulation is generally considered to be more energy efficient due to its ability to form an airtight seal. This means that it can help prevent air leaks and drafts, creating savings on your energy bill.

These leaks and drafts can account for up to 40% of energy loss in a building. Spray foam insulation has a higher R-value per inch than fiberglass insulation. Meaning it provides better insulation with a thinner layer.


Another important factor to consider is the durability of the insulation. Spray foam insulation is known for its long lifespan and ability to maintain its effectiveness over time. It doesn't settle or compress like fiberglass insulation can, which can lead to gaps and reduced insulation value.

Additionally, spray foam insulation is resistant to moisture and mold, which can be a problem for fiberglass insulation. While fiberglass insulation can last for several years, it may need to be replaced sooner than spray foam insulation due to its tendency to settle and degrade over time.


Cost is always a consideration when choosing insulation for your home or business. Spray foam insulation is generally more expensive than fiberglass insulation cost, but it can provide significant long-term savings in energy costs. It's important to consider the cost over the lifespan of the insulation, rather than just the upfront cost. Additionally, spray foam insulation can provide added value by improving the structural integrity of the building and reducing noise transmission.

Both spray foam insulation and fiberglass insulation have their pros and cons, and the best choice for your property will depend on your specific needs and budget. While spray foam insulation is generally considered to be more energy efficient and durable, it does come with a higher upfront cost.

Fiberglass insulation is a more budget-friendly option. However, it may need to be replaced sooner and can be less effective in reducing air leaks and drafts. Ultimately, it's important to work with a professional installer to evaluate your options and choose the insulation that will provide the best long-term value for your property.

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