Why Closed Cell Spray Foam Insulation is a Popular Choice for Homeowners

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By: Eric Garcia on December 1st, 2023

Closed cell spray foam insulation has become a buzzword in the world of home insulation, but what is behind this growing popularity?

Is it just a trend, or does closed cell foam genuinely offer benefits that homeowners should consider?

This article will explore the reasons behind the enthusiasm for closed cell spray foam insulation and provide insights into its appropriate use.

What is Closed Cell Spray Foam and Why is it So Popular?

Closed cell spray foam is a type of insulation material applied to an open surface.

Its cellular structure is tightly packed, leading to a dense and rigid form. This distinct makeup contributes to its unique properties as an insulating material.

Reason #1 - High R-Value

One of the primary reasons for the popularity of closed cell foam is its high R-Value.

Compared to other insulating materials like open cell spray foam, injection foam, fiberglass, and cellulose, closed cell spray foam offers a significantly higher R-Value per inch.

This high R-Value is a key factor in its efficiency in insulation, making it a highly attractive option for many.

However, it's crucial to understand that while R-Value is important, it's not the only factor to consider in insulation. Some misconceptions and misinformation about the sole importance of R-value need addressing.

Reason #2 - Perceived Structural Integrity

Another reason for the interest in closed cell foam insulation is the belief that it adds structural integrity to buildings.

While this might be true for structures like pole barns or detached garages, in typical residential framing, the primary structural integrity comes from the wood framing, not the insulation.

It's important to note that closed cell spray foam is very rigid and lacks flexibility. This rigidity can potentially cause issues in homes that naturally shift over time, potentially leading to problems like foundation cracks.

Reason #3 - Waterproof Nature

Many people are drawn to closed cell foam because it's often touted as waterproof.

While it's true that closed cell spray foam can prevent water penetration, it's not designed as a water-sealing membrane. Misusing it in places like basements or crawl spaces instead of proper encapsulation or water sealing can lead to severe problems.

The Reality Behind the Hype

It's essential to understand that closed cell spray foam insulation is a specific building material meant for particular applications.

It can significantly enhance home comfort and energy efficiency when used correctly. However, it is not a one-size-fits-all solution to all building problems. Misinformation, especially prevalent online, can lead to misapplication and subsequent issues.

Closed cell spray foam insulation is indeed a robust and efficient insulating material with unique properties. Its high R-value, perceived structural benefits, and waterproof nature contribute to its popularity.

However, like any building material, it must be used appropriately and not seen as a cure-all solution. There will be instances where open cell spray foam or injection foam are the better option for the project.

Homeowners should seek professional advice to ensure that closed cell spray foam fits their specific project needs. For more information on closed cell insulation and other insulation types, visit our Learning Center for detailed articles, blogs, and videos on building science.

Remember, the right knowledge leads to the right application. Make informed decisions for your home's insulation needs.

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About Eric Garcia

Eric brings his knowledge and training in building science, training in spray and injection foams from the manufacturers, more than eight years installing foam insulation, as well as selling and managing in the foam insulation industry. He is also BPI and Dale Carnegie certified and has taken several building science courses, including air sealing and building envelope. Eric is the Professor of Foam on our educational YouTube series Foam University. Even when Eric is off he is usually still “working” or thinking about work, but when he can get away he enjoys camping, hiking, hunting, and woodworking.