Common Myths About Closed-Cell Spray Foam Insulation Debunked
Closed-cell spray foam insulation has gained popularity as a high-performance insulation material for residential and commercial buildings. Its superior thermal resistance, moisture control, and structural reinforcement properties make it a preferred choice for energy-efficient construction. However, several misconceptions surround its use, leading to confusion among builders, homeowners, and architects. In this blog, we debunk the most common myths about closed-cell spray foam insulation.
Myth 1: Closed-Cell Spray Foam is Toxic and Unsafe
Reality
When properly installed by trained professionals, closed-cell spray foam is completely safe for residential and commercial applications. During installation, the foam undergoes a chemical reaction that causes it to expand and cure quickly. While off-gassing occurs during this process, proper ventilation and adherence to manufacturer guidelines ensure that indoor air quality remains unaffected. Once fully cured, closed-cell spray foam is non-toxic and does not release harmful fumes.
Myth 2: It’s Too Expensive to Be Worthwhile
Reality
While the upfront cost of closed-cell spray foam is higher than traditional insulation materials like fiberglass or cellulose, its long-term benefits outweigh the initial investment. It provides superior insulation, reduces energy bills by improving thermal efficiency, and acts as an air and moisture barrier, preventing costly damage from mold and moisture intrusion. Over time, homeowners and building owners can recoup the cost through energy savings and lower maintenance expenses.
Myth 3: Closed-Cell Spray Foam Causes Structural Damage
Reality
Some people believe that closed-cell spray foam can damage buildings by exerting excessive pressure on walls and ceilings. However, this is a misconception. While closed-cell foam expands during application, its expansion rate is controlled, making it suitable for various building structures. In fact, it enhances structural integrity by adding rigidity and strength to walls and roofs, making it an excellent choice for hurricane-prone or high-wind areas.
Myth 4: It Traps Moisture and Leads to Mold Growth
Reality
Unlike traditional insulation materials that can absorb and retain moisture, closed-cell spray foam creates an airtight and waterproof seal. It does not allow moisture to pass through, reducing the risk of mold and mildew growth. This makes it particularly effective in humid climates and areas prone to moisture issues, such as basements, crawl spaces, and attics.
Myth 5: It’s Not Environmentally Friendly
Reality
Early formulations of spray foam contained high levels of ozone-depleting chemicals, leading to concerns about environmental impact. However, modern closed-cell spray foams use low global warming potential (GWP) blowing agents, making them more eco-friendly. Additionally, the insulation’s energy efficiency reduces carbon emissions over the lifetime of the building, making it a sustainable choice.
Myth 6: Closed-Cell Spray Foam Degrades Over Time
Reality
Unlike fiberglass or cellulose insulation, which can settle, compress, or degrade over time, closed-cell spray foam maintains its performance for decades. It does not sag, lose its shape, or diminish in insulating capability, ensuring consistent energy efficiency throughout the building’s lifespan. Many manufacturers offer warranties of 20+ years, reflecting its long-term durability.
Myth 7: It’s Only Useful for New Construction
Reality
While closed-cell spray foam is commonly used in new construction, it is also an excellent option for retrofitting existing buildings. It can be applied to attics, walls, basements, and crawl spaces to improve insulation and air sealing. Professional installers can access hard-to-reach areas and apply the foam without major renovations, making it a practical solution for energy upgrades in older homes and buildings.
Conclusion
Closed-cell spray foam insulation is a highly effective, durable, and energy-efficient solution that offers superior performance compared to traditional insulation materials. Despite the myths surrounding its use, it remains one of the best choices for improving thermal efficiency, moisture control, and structural strength. By understanding the realities behind these misconceptions, homeowners, builders, and architects can make informed decisions about incorporating closed-cell spray foam into their projects.
