Igloo Insulation LLC
ClaimTypical insulation services: Attic insulation, Spray foam, Blown-in insulation, +2 more
The 30-Second Verdict
Closed cell is the right choice for Florida's humidity — its vapor barrier prevents moisture infiltration; open cell is cheaper but risks moisture accumulation in Florida's humid climate.
Head-to-Head Breakdown
Open Cell Spray Foam
Pros
- Lower cost ($0.50–$1.00/sq ft vs $1.50–$2.50)
- Better soundproofing
- Fills large cavities well
- R-3.5–3.7 per inch
Cons
- Permeable to moisture
- Can trap moisture in humid FL climate
- NOT a vapor barrier
- Requires vapor barrier added in FL applications
Closed Cell Spray Foam
Pros
- Full vapor barrier (critical in FL)
- R-6 to R-7 per inch
- Adds structural strength to roof deck
- Completely resists moisture infiltration
Cons
- Higher cost ($1.50–$2.50/sq ft)
- Requires trained professionals
- Off-gassing during cure
- Difficult to modify later
Side-by-Side Comparison
| Open Cell Spray Foam | Closed Cell Spray Foam | |
|---|---|---|
| R-Value per Inch | R-3.5–3.7 | R-6 to R-7 |
| Vapor Permeability | Open (moisture passes through) | Closed (vapor barrier) |
| Cost per Sq Ft (2" application) | $0.50–$1.00 | $1.50–$2.50 |
| Moisture Resistance in FL | Poor to moderate | Excellent |
| Structural Reinforcement | None | Yes (stiffens roof deck) |
| Sound Attenuation | Excellent | Good |
| Best FL Application | Interior walls (noise only) | Attic roof deck, crawl spaces |
| Inches Needed for R-38 | ~10.5 inches | ~5.5 inches |
Frequently Asked Questions
Which spray foam should I use in a Florida attic?
Closed cell spray foam is strongly preferred for Florida attics. Florida's 75–90% outdoor humidity means moisture-laden air constantly tries to infiltrate your attic. Open cell foam allows this moisture to pass through, potentially causing condensation and mold. Closed cell at 3–4 inches on the roof deck creates a true vapor barrier and conditioned attic.
Can I mix open and closed cell foam in Florida?
Yes — a common approach is closed cell on the roof deck (2–3 inches for vapor barrier) and blown-in insulation on the attic floor for additional R-value at lower cost. Open cell can be used in interior walls for soundproofing where moisture isn't the concern.
Is spray foam worth it in Florida?
In Florida's climate, closed cell spray foam in the attic typically saves $300–$600/year in cooling costs. Most homeowners see payback in 5–8 years. It also strengthens the roof deck and eliminates the hot, humid, unconditioned attic space that shortens HVAC equipment life.
Listed Local Florida Insulation Alternatives
You don't have to pick a national brand. Compare public rating data and contact details for these Florida-based insulation businesses, then verify credentials and request current quotes.
Insulation Plus of Tampa
ClaimTypical insulation services: Attic insulation, Spray foam, Blown-in insulation, +2 more
I-Foam & Insulation Inc
ClaimTypical insulation services: Attic insulation, Spray foam, Blown-in insulation, +2 more