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Open and Closed-Cell Spray Foam Insulation: Which One To Use?

Spray foam insulation is one of the 20th century’s finest construction and development inventions ever. Without the need to use traditional worn-out mattresses as insulators anymore, spray foam insulators can fill entire property cavities for maximum insulation and exceptional durability. It’s a lot more affordable and less time consuming too.

It pays to know about the two kinds of SPF insulation. Open-cell foams are greatly useful in interior applications while closed-cell  foams offer great advantages when it comes to outdoor applications. Read more about them below.

Open-Cell SPF

Adaptability is the biggest advantage of open-cell SPF. When they start to cure and dry upon application, they will turn into a dense but soft expanding material. In doing so, they can fill entire spaces, which helps improve interior property insulation advantageous for soundproofing and lowering your thermostat settings. Additionally, it will manage interior wall moisture and dry any kind of leak from your walls should it happen.


Hollow walls are a hallmark of every interior insulation job. Closed-cell SPF can only expand so much — and they harden easily. However, SPF specialists can apply vast amounts of open-cell SPF to ensure it expands within the cavity and completely filling it out. In doing so, it achieves exceptional insulation and soundproofing in the process. However, it does come with flaws: it can rapidly diffuse cold and hot air, which leads to condensation and damp walls when your house quickly changes its temperature.

Closed-Cell SPF

While it has limited use for interior insulation applications, closed-cell SPF is a great material for exterior applications. It turns hard yet malleable upon drying and curing, which makes it an excellent retardant of any wayward-flying material such as twigs, stones, and other debris. It is easy to repair, fire and flood-resistant, and offers a great deal of applications that can accommodate nearly any kind of application.


Wall racking strength requires traditional joist and foundational reinforcement. However, with closed-cell SPF, you can have decent reinforcement without the additional expense and labor needed to reinforce your walls using specially-designed and manufactured joists. Furthermore, it helps avoid the biggest flaw of open-cell SPF for interior applications: it will not allow vapor to penetrate and condense quickly.

Which One Is the Most Expensive?

Both closed and open-cell SPF are reasonably priced services that most SPF applications offer. The actual price of service and installation depends on the area size you need insulation. In addition, the time, equipment, and labor needed to install the spray polyurethane foam will have an impact on your final cost too.

Which Has The Better Lifespan?

Closed-cell and open-cell SPF are both capable of delivering exceptional interior and exterior insulation. However, both have the same lifespan that might require re-spraying  within 25-30 years. On the other hand, re-applications are quick and easy to manage thanks to specialists with exceptional experience in doing it in the least amount of time possible.

Regardless of which SPF you plan to use, it’s important to have specialists with long-term experience helping you with all your needs. If you have yet to find one, you can count on us at Ener Spray. With decades of experience providing high-quality insulation solutions, we only guarantee the finest results for all your needs. Contact us today!