Closed Cell Foam Insulation: Benefits, Cost & Best Uses
Why Closed Cell Foam Is Ideal for Florida Projects
If you’re working in Florida’s hot, humid climate, you need insulation that does more than just hold in air. That’s where closed cell foam stands out. Known for its strength, moisture resistance, and versatility, it’s an excellent choice for metal buildings, subfloors, and crawlspaces.
In this guide, we’ll break down what closed cell spray foam is, where it works best, and why builders and contractors trust it for long-term results.
What Is Closed Cell Spray Foam?
Closed cell spray foam is a high-density insulation that expands to fill gaps and cures into a solid, rigid layer. Its tightly packed cell structure blocks air, vapor, and water. Because of this, it serves as both insulation and a vapor barrier.
Unlike softer alternatives, it also reinforces the surface it’s applied to. This makes it especially useful in areas that need structural support, like roof decks or under metal panels.
To see how we install it and what to expect, visit our closed cell insulation page.
Benefits of Closed Cell Foam
Here are a few key reasons why professionals choose closed cell foam:
- High R-Value: Delivers up to R-7 per inch
- Moisture Barrier: Helps prevent mold, mildew, and rot
- Structural Strength: Adds durability to walls and roofing panels
- Air Sealing: Closes off gaps and cracks for good
Because it performs multiple roles at once, you’ll need fewer additional materials. This simplifies installation and improves long-term results.
Where It Works Best
Closed cell spray foam is commonly used in areas where moisture or structural support is a concern:
- Roof decks
- Crawlspaces
- Subfloors
- Metal buildings and steel structures
- Foundations and below-grade walls
In flood-prone or coastal areas, it’s often the first choice because of its ability to repel water.
What Does It Cost?
Pricing varies depending on the thickness and complexity of the job:
- 2 inches (R-14): $2.00 to $3.00 per square foot
- 3 inches (R-20): $3.00 to $4.00 per square foot
Here’s what makes it different: closed cell foam doesn’t just insulate—it also acts as a vapor barrier. That means you’re getting two building materials in one.
This dual function cuts down on extra steps. It also offers peace of mind in high-moisture environments. According to WhySprayFoam.org, properly installed spray foam can seal and protect building envelopes, improving durability and indoor conditions.
Why Choose Truly Sealed?
At Truly Sealed, we specialize in spray foam solutions for Central Florida. Our team installs GreenGuard Gold certified products like Accufoam. We’re licensed, experienced, and focused on long-term quality—not shortcuts.
Whether you’re working on a metal structure, a retrofit project, or a new subfloor, we’ll help you choose the right thickness and application strategy for your build.
Final Thoughts
Closed cell spray foam does more than traditional insulation. It seals, reinforces, and protects—all in one application. For metal buildings, crawlspaces, and flood-prone zones, it’s one of the smartest upgrades you can make.
Want to learn more or get a custom quote?