Spray Foam vs. Fiberglass for Florida Homes
Two great materials, two different jobs. Here's how spray foam and fiberglass compare on performance, cost, and moisture control in our climate.
It's the question we hear most: spray foam or fiberglass? The honest answer is that they're different tools for different jobs. The right choice depends on where you're insulating and what problem you're solving. Here's a straight comparison for Northwest Florida homes.
Side-by-Side Comparison
| Factor | Spray Foam | Fiberglass |
|---|---|---|
| R-value per inch | R-6.0 to R-7.0 (closed-cell) | R-3.0 to R-4.3 |
| Air sealing | Excellent, seals as it expands | None on its own |
| Moisture control | Closed-cell resists moisture | Must be kept dry |
| Upfront cost | Higher | Lower |
| Best for | Attics, crawlspaces, coastal homes | Open walls, floors, standard framing |
| Sound dampening | Good | Good |
| Lifespan | Decades, stable | Decades if kept dry |
When Spray Foam Wins
Spray foam is the stronger choice when humidity and air leakage are the real problems, which, on the Gulf Coast, they usually are. For attics, crawlspaces, rim joists, cathedral ceilings, and coastal homes, the combination of high R-value, air sealing, and moisture resistance is hard to beat. If your home feels sticky, has musty crawlspace air, or you want maximum performance, foam earns its premium.
When Fiberglass Wins
Fiberglass is the smart-value choice for open walls and floors on standard framing, new construction, additions, and any project where budget matters and the area can be kept dry. Installed correctly, snug, full-depth, and paired with air sealing. It delivers reliable, cost-effective performance.
Our usual recommendation
Many Florida homes get the best result from a combination: spray foam where moisture and air sealing matter most, and fiberglass or blown-in where value counts. We'll recommend the right mix for your home during a free estimate, never a one-size-fits-all package.
Get a Recommendation for Your Home
The best way to choose is to have someone who knows Florida homes look at yours. Request a free estimate and we'll walk your home, explain the trade-offs in plain terms, and recommend what actually fits your needs and budget.
Spray Foam vs. Fiberglass FAQs
Is spray foam or fiberglass better for a Florida home?
Neither is universally 'better'. They excel at different things. Spray foam is the top choice when air sealing and moisture control matter most, like attics, crawlspaces, and coastal homes. Fiberglass is the cost-effective choice for open walls and floors. Many Florida homes use both.
Does spray foam handle humidity better than fiberglass?
Yes. Closed-cell spray foam acts as both insulation and a moisture barrier, blocking the humid Gulf air that punishes coastal homes. Fiberglass insulates well but doesn't stop air or moisture movement on its own, so it relies on separate air sealing and staying dry.
Is fiberglass insulation cheaper than spray foam?
Generally yes, fiberglass costs less per square foot, which makes it a smart value for open walls, floors, and standard framing. Spray foam costs more but delivers air sealing and moisture control that fiberglass can't, which can justify the price in the right application.
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