Closed-Cell Spray Foam
Closed-cell spray foam is the densest, highest-R-value insulation you can put in a South Florida home. At R-6.5 per inch it doubles as a Class II vapor retarder and adds structural racking strength to walls and roof decks — engineered for Boca Raton's coastal humidity and hurricane wind loads.
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Before-and-after infrared proof on every job
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Transferable to the next owner
Closed-Cell Spray Foam for South Florida Properties
closed-cell spray foam is the workhorse of Florida attic retrofits. We will tell you plainly when it is the right specification and when a less expensive approach delivers the same outcome.
South Florida sits in South Florida, where the recommended attic target is R-38 to R-49. That number, along with where your ductwork runs and what condition the existing assembly is in, is what determines the right specification for your property.
Closed-Cell Spray Foam at a glance
- R-value
- R-6.5 / inch
- Installed cost
- $2.40 – $4.90 per sq ft installed
- Service life
- 80+ years
- Available in
- South Florida and throughout South Florida
Types and Methods
2 lb closed-cell
The standard for roof decks, crawl spaces, and coastal walls. At 2 inches thick it delivers R-13 and qualifies as a Class II vapor retarder — blocking moisture migration in salt-air environments. It also bonds to the substrate, adding structural racking strength.
High-density closed-cell
Used where maximum R-value in minimum thickness is needed — flat roofs, metal buildings, and tight cavities. Delivers up to R-7 per inch in optimized formulations and creates an impermeable air and vapor barrier.
Closed-cell foam requires a dry substrate and proper temperature range for adhesion. We check for roof leaks, condensation, and active moisture before spraying — foaming over a wet surface traps the moisture permanently and the foam will not adhere correctly.
Benefits for South Florida Property Owners
- Highest R-value per inch of any insulation — R-6.5.
- Class II vapor retarder — blocks Florida humidity and moisture migration.
- Increases wall and roof-deck structural strength by up to 250%.
- Impervious to water — won't mold, rot, or lose R-value if wet.
- Ideal for roof decks, crawl spaces, and coastal wall cavities.
Best Applications
- Roof decks and conditioned attics
- Crawl spaces and rim joists
- Coastal and waterfront wall cavities
- Metal buildings and barndominiums
- Hurricane-zone structural reinforcement
How We Install It
- 1FLIR-scan to map the substrate and identify moisture issues
- 2Confirm the cavity is dry, clean, and free of debris
- 3Mask and protect all adjacent surfaces
- 4Spray closed-cell foam to the specified depth in uniform passes
- 5Trim overspray flush to framing members
- 6FLIR-verify the seal and document the thermal delta
- 7Walk the job with you and deliver the before-and-after report
Cost and R-Value Reference
Florida insulation cost & R-value reference.
Typical installed costs across South Florida by material. Pricing varies with access, square footage, and site conditions — every Cardinal quote itemizes material, R-value, installed inches, and square footage.
| Material | Installed cost | R-value / inch | Service life |
|---|---|---|---|
| Blown-in fiberglass | $1.10 – $2.00 / sq ft | R-2.2 – R-2.7 / in | 20–30 years |
| Blown-in cellulose | $1.20 – $2.40 / sq ft | R-3.2 – R-3.8 / in | 20–30 years |
| Fiberglass batts | $0.90 – $2.10 / sq ft | R-3.1 – R-3.4 / in | 25+ years |
| Mineral wool | $1.60 – $3.40 / sq ft | R-3.0 – R-4.3 / in | 50+ years |
| Open-cell spray foam | $1.50 – $3.20 / sq ft | R-3.6 – R-3.8 / in | 80+ years |
| Closed-cell spray foam | $2.40 – $4.90 / sq ft | R-6.0 – R-7.0 / in | 80+ years |
| Rigid foam board | $1.40 – $3.80 / sq ft | R-3.8 – R-6.5 / in | 50+ years |
| Radiant barrier | $0.55 – $1.90 / sq ft | Reflective (no R) | 25+ years |
| Duct sealing + R-8 wrap | $800 – $3,500 / system | R-8 (duct) | 15–25 years |
| Insulation removal | $1.10 – $2.90 / sq ft | — | One-time |
Pricing reflects typical Florida installed costs and varies with access, square footage, and site conditions. Source: U.S. Department of Energy insulation guidance, Florida Building Code R402, and IECC climate zone 1 requirements.
Pricing reflects typical Florida installed costs and varies with access, square footage and site conditions.
Closed-Cell Spray Foam FAQs
R-6.5 per inch — the highest of any common insulation. A 3-inch roof-deck application delivers R-19.5 in a fraction of the space fiberglass would need.
Yes. At 2 inches thick, closed-cell foam qualifies as a Class II vapor retarder, blocking moisture migration — critical for South Florida's humidity and coastal salt air.
Yes — testing shows closed-cell foam can increase wall racking strength by up to 250%, a real advantage in hurricane-zone construction across Boca, Delray, and Boynton.
Serving the Boca–Delray–Boynton corridor.
From the Boca inlet to Boynton's western estates — every hot zone below is a home we sealed this year. This is our local service area.
