The Benefits of Open-Cell and Closed-Cell Spray Foam Analyzed

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The insulating and air-blocking properties of spray foam make it ideal for completely enclosing and insulating rooms, including ceilings, walls, and floors. Spray foam is a solution to the growing demand for environmentally conscious homeowners and business owners to improve the energy efficiency of their buildings. Although spray foam can still catch fire if subjected to high enough temperatures, it is significantly less likely to do so, thanks to the addition of flame retardants.

Insulation spray comes in two primary varieties: open-cell and closed-cell. Each has its own set of pros and cons that dictate when and how it should be used. Both types can insulate a building, but they do so in different ways. This may make it more difficult, particularly for beginners, to choose one based on its properties. This piece will help you make the best decision by comparing and contrasting open-cell and closed-cell foam.

Open- vs Closed-Cells

Closed-cell spray foam is the clear winner when it comes to blocking draughts and keeping warm air inside. On the other hand, it has a drawback that may prevent many people from purchasing it. Lower resilience necessitates more extensive cost and time to install checks.

Open-cell spray foam is unparalleled when it comes to absorbing sound and suppressing vibrations. In comparison to closed-cell spray foam, it expands quickly, can be easily shaped, and is much lighter in weight. The low cost and low complexity of implementation are direct results of these features.

Which spray foam insulator is the most effective? In the end, it comes down to deciding which of the available options is best for you.

Contrasting Insulation Benefits


Closed-cell spray foam, to put it simply, is an excellent insulator that does a great job of preventing heat loss and air leakage. Increases in efficiency are realised through its higher density and R-value. There are, however, exceptions. In comparison to open-cell spray foam, closed-cell spray foam is extremely rigid, making it challenging to work with in confined areas. It offers several benefits:

  • Effective in areas prone to flooding and storms. Its water-repellent properties act as a shield against the intrusion of moisture into your structure.
  • It has the potential to insulate to a high temperature, making it an effective barrier against draughts and heat loss.
  • Is compacted into a bubble shape that increases in thickness by 25–30 mm with each additional layer.
  • Useful for increasing a structure’s solidity and weight, among other benefits.


A major difference between open-cell insulation and closed-cell spray foam is the latter’s higher density. As density goes down, so does insulation efficiency (measured in R-value). We’ve already established that open-cell spray foam has no equals when it comes to absorbing noise and minimising vibration. Due to its expansion properties, it can be used in places where rigid, closed-cell spray foam would not fit, simplifying the installation process. As it dries, it seals up any gaps it comes across. The benefits of using open-cell insulation include:

  • reducing the amount of ambient noise and reverberation in a space.
  • removing dust and allergens from the air, thereby improving the quality of air inside the house.
  • sealing any gaps or cracks that may allow the wind and cold in.
  • expanding to one hundred times its original size to reach inaccessible areas, thus providing superior protection with minimal investment of time and effort.
  • providing a solution that is easy to work with, lightweight, flexible, and sturdy.

Only qualified professionals should attempt to install spray foam insulation due to its high cost. Whether you use open-cell or closed-cell foam may be irrelevant if complications arise, such as insufficient chemical mixing and off-gassing. You can find certified Isothane installers nationwide who will be happy to assist you with the decision-making process and the installation.

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