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

What is Open Cell Spray Foam

Open-cell spray foam is a lower-density insulator that expands to fill spaces, forming a soft, effective barrier. Unlike closed-cell foam, it has a looser cell structure, making it more flexible and ideal for sound dampening in interior walls and ceilings.

Where to use Open Cell Spay Foam?

Interior Walls and Ceilings

Open-cell foam is great for insulating interior walls, filling gaps seamlessly for thermal efficiency.

Attics and Roof Decks

Used often in attics, open-cell foam seals air leaks and offers a consistent thermal barrier.


Open-cell foam is excellent for reducing noise transfer between walls and floors.

Hard-to-Reach Spaces

Its expansiveness makes open-cell foam ideal for insulating around obstructions like wiring and plumbing.

Why Use Open Cell? 

Lower Cost

Open-cell spray foam is generally less expensive per square foot than its closed-cell counterpart. This makes it an economically advantageous option for large-scale insulation projects where budget constraints may be a concern.

Sound Dampening

Known for its excellent acoustic properties, open-cell foam is highly effective at reducing noise transmission. It's particularly well-suited for interior walls, between floors, and in media rooms where soundproofing is a high priority.


The softer, more flexible structure of open-cell foam allows it to expand and contract with your building. This adaptability makes it particularly useful for areas that might settle or shift over time, ensuring long-lasting insulation performance.


The porous nature of open-cell foam allows for the diffusion of moisture vapor, reducing the risk of condensation within walls. This can contribute to a healthier indoor environment and is less likely to trap moisture, which can lead to mold issues.

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

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