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Understanding Closed-Cell Spray Foam: What, Where, and Why

What is Closed Cell Spray Foam

Closed-cell spray foam is a high-density insulating material that, when applied, expands and hardens to form a seamless, solid barrier. Unlike its open-cell counterpart, closed-cell foam has a compact cell structure, making it more rigid and water-resistant. It's a polymer made from a blend of isocyanate and polyol resin, which gives it its dense, closed-cell nature.

Where's Closed-Cell Best Used?

Exterior Walls and Basements

Closed-cell foam excels in exterior walls and basements due to its high thermal resistance and moisture-blocking properties.

Attics and Crawl Spaces

Closed-cell foam is ideal for hard-to-reach areas like attics and crawl spaces, offering both structural strength and thermal and moisture resistance.

Commercial Properties

In commercial properties, closed-cell foam enhances exterior walls and roofs with insulation and structural support.

Specialized Applications

Closed-cell foam is versatile, ideal for special uses like insulating pools and cold storage due to its moisture resistance and high R-value.

Why Use Closed Cell? 

Energy Efficiency

Closed-cell spray foam provides an unparalleled thermal barrier, significantly reducing heat transfer through walls and ceilings. This leads to less strain on heating and cooling systems, equating to tangible energy bill savings over time. By optimizing your property's energy efficiency, you're not just saving money—you're also reducing your carbon footprint, making it an eco-friendly choice.

Structural Integrity

Beyond its insulating capabilities, closed-cell spray foam contributes to the structural strength of your property. The foam hardens into a rigid material that can bolster the sturdiness of walls and roofing. This can be especially valuable in areas prone to extreme weather conditions, offering an extra layer of structural reinforcement.

Moisture Resistance

One of the standout features of closed-cell spray foam is its excellent resistance to moisture and water. Unlike traditional insulation materials that can absorb water, closed-cell foam acts as a barrier, preventing moisture infiltration. This makes it ideal for areas prone to dampness or water exposure, such as basements, bathrooms, and even underneath concrete slabs.


Closed-cell spray foam's versatility is one of its most appealing features. Because it can adhere to a variety of surfaces and fill irregular shapes, it's an ideal choice for insulating complex or hard-to-reach areas. Whether you need to insulate an attic with many nooks and crannies or a crawl space close to the ground, closed-cell spray foam can do the job effectively.




If you’d like more information about our Closed Cell Spray Foam, get in touch today.

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