Open Cell vs Closed Cell Spray Foam Insulation Comparison

Before we dive into the pros and cons of open cell vs closed cell insulation, it is important to note that they are both superior in their own ways. Due to this factor, industry experts believe that it is best to use a combination of a variety of insulating materials in order to fully insulate your property to maximum potential. Across residential and commercial properties specific insulation will be needed to optimise their effects. We can categorise the properties of cell foam insulation to the following: Structure, Application, Density, R-Value and Expansion.


Open Cell insulation takes a lighter ‘foamier’ texture than its counterpart. The cell composition of this component is not completely encapsulated, allowing for a flexible and versatile spray foam insulation.

Whereas on the other hand, closed cell insulation takes a more rigid format, cells are completely closed to provide ultimate robust and rigid properties whilst locking out any forms of moisture, water and humidity.

These two cell foam insulators hold opposing structures that can be applied in different areas for optimum benefits. For example, in areas that typically become affected by water it would be preferable to used closed cell insulation in order to contain and keep out the water leakage.


Residential properties mostly use open cell foam insulation due the cells ability to cover all nooks and crannies because of its lightweight and flexible components. This option is also a great money saver as areas usually only require one coating of open cell foam insulation, the foam spreads rapidly covering the entire areas desired. Due to the flexible nature, open cell foam insulation holds a much sought out soundproof component. This form of insulation is great for soundproofing and therefore is typically used in attic floors, roof lines and above grade exterior walls.

On the contrary, closed cell foam insulation is specifically suited to commercial and industrial properties. Due to its inherent strong, robust and rigid nature, it provides the perfect structural foundation for these types of properties. However, this is not to say that it shouldn’t be used in residential properties, since roofing and areas are subject to heavy rainfall will benefit highly from using closed cell foam insulation. Other applications of closed cell insulation would be basements, crawl spaces, pole barns, metal buildings and exterior applications.


On average, open cell foam insulation has around 0.5lbs per cubic foot density. This provides that cell formulation with the flexibility and lightweight properties mentioned above.
In contrast, closed cell foam insulation can reach over 3x the aforementioned, averaging 1.75lbs per cubic foot, or more. This density allows for a more robust cell composition, providing rigid features and structural integrity.


The R-Value of an insulation material indicates its resistance to heat, typically meaning how much insulating power does a product have. Open cell products traditionally have a standard R-Value of 3.7 per inch.

In regard to closed cell insulation, this product thrives on its R-Value and the fact that it is a superior heat-resistant and insulating material. Closed cell products average, on estimate, an R-Value of 7 per inch. In particular areas that are most prone to water damage, moisture build-up and humidity, it is recommended to spray a minimum of 2 inches of closed cell foam insulation, thus equalling an R-Value of 14 inches or more.


As previously mentioned, open cell products expand monumentally, averaging 100x its liquid state, allowing to cover and create an airtight environment. Open cell insulation is designed to reach 3-3.5 inches of thickness, allowing for only one layer of application.

On the other hand, closed cell products are denser and therefore expand less. This insulation is considered air impermeable at around 1.5 inches thick, which is around 40x its liquid state. The more inches sprayed, the greater the R-Value.

EcoSpray-Foam System

We can deliver state-of-the-art spray foam insulation for all properties. Whether you desire open cell or closed cell, residential or commercial, we have the expertise, quality and experience to reach your satisfaction. Our latest technologies, such as Icynene Spray Foam technology can give you the soundproof, water resistant and mold free property that you seek. Moreover, our spray foam products are environmentally friendly, water-blown and highly effective. Contact us today for your quote.

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