BLOG Spray Foam Insulation Vs. Fiberglass: Which Is Better for Your Home? Jul 15, 2025

Choosing the right insulation for your home is crucial, not only for energy efficiency but also for maintaining a comfortable environment year-round. With various options available, many homeowners are left asking: Should I choose spray foam insulation or fiberglass? Charly Spray Foam Insulation is here to provide clarity and help you make an informed decision.

Spray foam insulation is renowned for its superior air barrier and moisture-blocking abilities. It is applied wet and expands to fill cracks and crevices upon drying, creating a seamless barrier that effectively prevents air leaks. This property makes spray foam particularly appealing for homeowners looking to enhance energy efficiency. Its expansive nature also allows it to fill hard-to-reach spaces and irregular surfaces, ensuring comprehensive coverage that minimizes heat transfer.

In contrast, fiberglass insulation, one of the most traditional forms of insulation, is composed of tiny glass fibers woven together. It typically comes in batts or rolls and requires careful installation to avoid gaps that can lead to energy losses. While fiberglass is less expensive upfront, it is not as effective in sealing air leaks compared to spray foam. It is, however, well-suited for high-temperature areas, given its heat-resistant properties.

One of the primary considerations when choosing insulation is cost. Fiberglass has the advantage of a lower initial cost, making it a popular choice for budget-conscious projects. However, the long-term benefits of spray foam — including improved energy efficiency and potential savings on heating and cooling bills — can offset its higher upfront costs. Spray foam's durability also means it typically requires less maintenance over time, adding to its cost-effectiveness in the long run.

Energy efficiency is another critical factor. Spray foam insulation offers one of the highest R-values per inch, a measure of thermal resistance, available in the market. This high R-value means better insulation performance, which translates to lower energy costs. Fiberglass typically has a lower R-value, meaning its insulating ability is less potent unless installed in thicker layers, which might not be feasible in all applications.

When it comes to environmental impact, each type of insulation has its considerations. Fiberglass insulation can be made from recycled glass, reducing its environmental footprint. Spray foam, traditionally made from petroleum-based materials, does have eco-friendly alternatives in the form of soy-based sprays. Additionally, the energy savings associated with spray foam can contribute to a reduced carbon footprint over time.

Installation and lifespan are further points of differentiation. Spray foam requires professional installation due to its complex application process, ensuring optimal performance. Fiberglass can be installed by homeowners, but professional installation is recommended to avoid gaps. Over its lifespan, which can exceed 25 years, spray foam maintains its insulating properties without sagging or settling, unlike fiberglass, which may require replacement or additional layers over time due to wear.

In conclusion, the choice between spray foam insulation and fiberglass largely depends on your specific needs and priorities. If budget constraints and ease of installation are your primary concerns, fiberglass may be suitable. However, if you're aiming for maximum energy efficiency, superior air sealing, and long-term savings, spray foam insulation from Charly Spray Foam Insulation is an investment well worth considering. Whatever your choice, ensuring your home is properly insulated will lead to increased comfort and reduced energy costs in the future.