If you’ve started researching insulation upgrades, you’ve probably run into two terms over and over again: open cell and closed cell spray foam. They sound similar, but they behave very differently once they’re inside your walls, attic, or roofline — and picking the wrong one can mean paying more than you need to, or not getting the protection your home actually needs.
Here’s a straightforward breakdown to help you figure out which one fits your project.
What Makes Open Cell Spray Foam Different
Open cell spray foam is the lighter, softer option. As it cures, the tiny cells inside the foam stay open, which lets it expand more and fill oddly shaped spaces easily. That expansion is exactly why it’s such a popular choice for:
- Attics — it fills every gap around rafters and framing
- Interior walls — great for cutting down on noise between rooms
- Ceilings — helps create a quieter, more comfortable living space
Because it’s less dense, open cell foam typically costs less per square foot than closed cell. It won’t act as a vapor barrier on its own, so it’s usually not the first choice for areas that see a lot of moisture, like exterior walls or crawl spaces in humid parts of Texas.
What Makes Closed Cell Spray Foam Different
Closed cell spray foam is denser and more rigid. The cells are fully closed and packed tightly, which gives it a higher R-value per inch and turns it into an effective moisture barrier at the same time. That combination makes it the go-to option for:
- Exterior walls and rooflines — added structural rigidity plus weather protection
- Metal buildings and shops — resists condensation that can form on metal surfaces
- Basements and crawl spaces — keeps ground moisture from creeping into the structure
It costs more upfront than open cell foam, but for buildings facing extreme heat, humidity, or storm exposure — which describes a lot of North Texas — that extra durability often pays for itself in energy savings and long-term protection.
So Which One Should You Choose?
In most homes, the answer isn’t “one or the other” — it’s both, used strategically. A lot of our customers end up with open cell foam in interior spaces and attics for comfort and noise control, paired with closed cell foam in exterior walls or metal buildings where moisture resistance and strength matter most.
The right mix really comes down to your specific structure, your climate exposure, and your budget, which is why a free, in-person estimate makes such a difference — it’s hard to get this right from a general online guide alone.
Why It’s Worth Getting Professional Guidance
Whether you’re insulating a new build, upgrading an older home, or finally tackling that metal shop out back, Texas Spray Foam Insulation has spent 15 years helping homeowners and business owners across the DFW area make this exact decision. We work on residential structures, commercial buildings, and metal buildings alike, using both open cell and closed cell spray foam depending on what each space actually needs.
We’re proud to serve communities throughout the region, including Denton, Sherman, and Keller, with the same no-hidden-costs, no-cut-corners approach on every job.
Not sure which type of spray foam is right for your project? Call us at 214-216-2820 or request a free estimate on our homepage, and we’ll walk your space with you before recommending anything.
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