--- title: Spray Foam vs Fiberglass vs Blown-In | Best for Florida 2026 description: "Spray foam vs fiberglass vs blown-in in Florida: R-values, moisture, lifespan and cost compared. Written price from county records, no site visit. Since 2012." --- [Skip to content](https://www.idealinsulationinc.com/insulation-blog/spray-foam-vs-fiberglass-vs-blown-in-which-is-best-for-florida-homes#main-content) [IDEALINSULATION](https://www.idealinsulationinc.com/) [Services](https://www.idealinsulationinc.com/#services)[For builders](https://www.idealinsulationinc.com/insulation-contractor-for-builders-naples-fl-swfl)Explore [Home](https://www.idealinsulationinc.com/)[Spray foam](https://www.idealinsulationinc.com/services/spray-foam-insulation-naples-fl)[Attic insulation](https://www.idealinsulationinc.com/services/attic-insulation-naples-fl)[Insulation removal](https://www.idealinsulationinc.com/professional-insulation-removal-naples-fl-emergency-service-ideal-naples-swfl)[For builders](https://www.idealinsulationinc.com/insulation-contractor-for-builders-naples-fl-swfl)[Service areas](https://www.idealinsulationinc.com/areas-served-swfl)[Insulation guides](https://www.idealinsulationinc.com/insulation-blog)[Contact Ideal](https://www.idealinsulationinc.com/contact-us-ideal-insulation) [(239) 455-2002](tel:+12394552002) [Home](https://www.idealinsulationinc.com/) / [Insulation guides](https://www.idealinsulationinc.com/insulation-blog) Ideal Insulation · Southwest Florida # Spray Foam vs Fiberglass vs Blown-In: Which Is Best for Florida Homes? ![](https://app.hubspot.com/settings/avatar/d41d8cd98f00b204e9800998ecf8427e)[Ideal Insulation](https://www.idealinsulationinc.com/insulation-blog/author/ideal-insulation) March 15, 2026 Every Florida homeowner shopping for insulation hits the same fork: spray foam costs more upfront, fiberglass is cheap, and blown-in is in the middle. Which one actually makes sense when you live in a state where humidity tries to destroy everything? We've installed all three across Lee, Collier and Charlotte counties since 2012. Here's the honest comparison. ## The Quick Comparison | Factor | Closed Cell Spray Foam | Open Cell Spray Foam | Blown-In Fiberglass | Fiberglass Batts | | --- | --- | --- | --- | --- | | R-Value Per Inch | R-6.5 | R-3.7 | R-2.5 | R-3.1 | | Air Sealing | Yes | Yes | No | No | | Moisture Barrier | Yes | No | No | No | | Cost Per Sq Ft | $2-4 | $1-2 | $0.50-1.25 | $0.30-1.00 | | Lifespan | 20+ years | 20+ years | 10-15 years | 10-15 years | | Mold Resistance | Excellent | Good | Poor | Poor | | Hurricane Resistance | Adds structural strength | Minimal | None | None | ## Why This Comparison Is Different in Florida ### 1. Humidity Is the Enemy Southwest Florida averages 74% relative humidity. In summer, it's 85-95%. When warm, humid air hits a cool surface (your air-conditioned ceiling), condensation forms. Inside fiberglass insulation, that means mold growth, R-value collapse, and structural damage over time. Spray foam — especially closed cell — doesn't absorb moisture. It seals the building envelope so humid air can't reach cool surfaces. ### 2. Your Attic Is an Oven Southwest Florida attics run 130-140°F in summer. Your ductwork is up there, pumping 55°F air through ducts surrounded by 130-140°F air. Blown-in fiberglass on the attic floor tries to block heat, but your ducts still cook. **Open cell spray foam on the roof deck** brings the attic inside the conditioned envelope, so it runs much closer to indoor temperature instead of 130-140°F. Ducts stay cool. Homeowners commonly report their AC cycling off in the afternoon instead of running until sundown. For an unvented roof assembly, establish the required R-value from the approved plans and energy calculations, then use the selected foam product's published thickness table. Open-cell foam does not have a universal five-inch R-30 rating. Coordinate moisture control and ventilation with the assembly design. ### 3. Hurricane Season Is Real Closed cell spray foam sprayed against the roof deck bonds the sheathing to the trusses and adds structural strength to the roof assembly. It's also a vapor barrier. That combination is why builders spec it on coastal jobs. ## When Each Type Makes Sense ### Closed Cell Spray Foam — The Premium Choice **Best for:** Crawl spaces, coastal homes, flood zones, garages, exterior walls. At R-6.5 per inch with a moisture barrier, it's the gold standard when moisture is the primary concern. ### Open Cell Spray Foam — The Smart Middle Ground **Best for:** Attic roof decks, interior walls, soundproofing, most residential applications. Excellent air seal at half the cost of closed cell. This is what we install in the majority of Naples attics. ### Blown-In Fiberglass — The Budget Option **Best for:** Supplementing existing insulation, flat attic floors on a tight budget, rental properties. Quick and cheap but doesn't air seal, settles over time, and holds moisture. ### Fiberglass Batts — Economy Choice **Best for:** Interior partition walls for soundproofing, and frame walls in new construction at R-13. Not recommended as a standalone attic solution in Florida — gaps at every stud, wire, and pipe let humid air through. ## Install Cost and Service Life (1,500 sq ft attic) | | Blown-In | Open Cell Foam | Closed Cell Foam | | --- | --- | --- | --- | | Install cost | $1,125 | $2,250 | $4,500 | | Needs replacement? | Yes (10-15 yrs) | No | No | Blown-in is the cheapest to install. Open cell costs about twice that, seals air instead of just slowing heat, and doesn't come back around on a replacement cycle — which is why it's what goes into most of the Naples attics we do. Your actual number comes off your county property-appraiser record, in writing, before anybody drives out. ## Our Recommendation for Most SWFL Homes 1. Attic: Choose a vented attic-floor or an approved unvented roof assembly for the project. Specify the required R-value and the selected product's installed thickness; a generic open-cell thickness is not proof of R-30. 2. **Crawl spaces:** Closed cell spray foam 3. **Exterior walls (new construction):** R-4.1 board on block walls, R-13 batts in frame walls, mineral wool at garage framing and wet areas 4. **Interior walls:** Fiberglass batts for sound dampening 5. **Coastal/flood zone:** Closed cell throughout ## Still Not Sure? Send us the address. We size the job off your county property-appraiser record and send back a written price — no site visit, no sales pitch at your kitchen table. You get a free pre-visit before we install, and most installs happen the same week, often within 48 hours. **[Get your written price →](https://www.idealinsulationinc.com/contact-us-ideal-insulation)** Want someone to walk the house first? [Book a free energy audit](https://www.idealinsulationinc.com/free-energy-audit). ### Related Insulation Resources - → [Spray Foam Insulation Cost Guide](https://www.idealinsulationinc.com/insulation-blog/spray-foam-insulation-cost-in-naples-fl-2026-price-guide) - → [Open Cell vs Closed Cell Explained](https://www.idealinsulationinc.com/insulation-blog/open-cell-vs-closed-cell-spray-foam-the-complete-comparison-guide) - → [Blown-In Insulation in Naples](https://www.idealinsulationinc.com/blown-in-insulation-naples-swfl/) - → [Batt Insulation Services](https://www.idealinsulationinc.com/batt-insulation-naples-swfl/) - → [Get a Written Insulation Price](https://www.idealinsulationinc.com/contact-us-ideal-insulation) --- ### Ready to Lower Your Energy Bills? [Ideal Insulation](https://www.idealinsulationinc.com) is a Naples-based insulation contractor serving Lee, Collier and Charlotte counties since 2012 — Naples, Fort Myers, Cape Coral, Bonita Springs, Estero, Marco Island, Lehigh Acres, Punta Gorda and Port Charlotte. Whether you need [spray foam insulation](https://www.idealinsulationinc.com/services/spray-foam-insulation-naples-fl), [blown-in attic insulation](https://www.idealinsulationinc.com/blown-in-insulation-naples-swfl/), or insulation removal, we run 9 trucks and 20+ certified installers — all on payroll, no subcontracting. **[Get a written price from your county property record](https://www.idealinsulationinc.com/contact-us-ideal-insulation)** or call **(239) 455-2002**. Se habla español. Put the guide to work ## Get an estimate for your property Send the address, project details and any plans or photos. We can discuss the insulation scope, existing conditions and scheduling. [Request an Estimate](https://clienthub.getjobber.com/hubs/d0e0f91b-8c25-49dd-9fb4-6813040a7759/public/requests/4221726/new)[Call (239) 455-2002](tel:+12394552002) [Spray foam options in Naples](https://www.idealinsulationinc.com/services/spray-foam-insulation-naples-fl) · [Builder bids and plan review](https://www.idealinsulationinc.com/insulation-contractor-for-builders-naples-fl-swfl) Prefer email? [estimates@idealinsulationinc.com](mailto:estimates@idealinsulationinc.com) [Share on Facebook](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fwww.idealinsulationinc.com%2Finsulation-blog%2Fspray-foam-vs-fiberglass-vs-blown-in-which-is-best-for-florida-homes)[Share on LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fwww.idealinsulationinc.com%2Finsulation-blog%2Fspray-foam-vs-fiberglass-vs-blown-in-which-is-best-for-florida-homes) ## More insulation guides ### [Insulation Company Marco Island FL | Closed Cell Spray Foam](https://www.idealinsulationinc.com/insulation-blog/insulation-company-marco-island-fl-closed-cell-spray-foam) August 16, 2026 [Read guide →](https://www.idealinsulationinc.com/insulation-blog/insulation-company-marco-island-fl-closed-cell-spray-foam) ### [Insulation Contractor Bonita Springs FL](https://www.idealinsulationinc.com/insulation-blog/insulation-contractor-bonita-springs-fl) August 16, 2026 [Read guide →](https://www.idealinsulationinc.com/insulation-blog/insulation-contractor-bonita-springs-fl) ### [Insulation Contractor in Estero, FL: Spray Foam & Blown-In](https://www.idealinsulationinc.com/insulation-blog/insulation-contractor-in-estero-fl-spray-foam-blown-in) August 16, 2026 [Read guide →](https://www.idealinsulationinc.com/insulation-blog/insulation-contractor-in-estero-fl-spray-foam-blown-in) **Ideal Insulation Inc.** 4950 Golden Gate Pkwy, Naples, FL 34116 [(239) 455-2002](tel:+12394552002) [estimates@idealinsulationinc.com](mailto:estimates@idealinsulationinc.com) © 2026 Ideal Insulation Inc. ## Plan your next project [Spray foam](https://www.idealinsulationinc.com/services/spray-foam-insulation-naples-fl)[Attic insulation](https://www.idealinsulationinc.com/services/attic-insulation-naples-fl)[Builder bids](https://www.idealinsulationinc.com/insulation-contractor-for-builders-naples-fl-swfl)[Service areas](https://www.idealinsulationinc.com/areas-served-swfl)[Contact](https://www.idealinsulationinc.com/contact-us-ideal-insulation)[RSS feed](https://www.idealinsulationinc.com/insulation-blog/rss.xml)[Privacy Policy](https://www.openphone.com/policies/OR2nl3hy3W) [Get an Estimate](https://clienthub.getjobber.com/hubs/d0e0f91b-8c25-49dd-9fb4-6813040a7759/public/requests/4221726/new)[Call Ideal](tel:+12394552002) Chat with us ## Related insulation resources - [Spray Foam Insulation Naples & SWFL →](https://www.idealinsulationinc.com/services/spray-foam-insulation-naples-fl) - [Blown-In Insulation Naples →](https://www.idealinsulationinc.com/blown-in-insulation-naples-swfl/) - [Batt Insulation Naples →](https://www.idealinsulationinc.com/batt-insulation-naples-swfl/) - [Spray Foam Insulation Cost Guide (2026) →](https://www.idealinsulationinc.com/insulation-blog/spray-foam-insulation-cost-in-naples-fl-2026-price-guide) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Ideal Insulation", "url" : "https://www.idealinsulationinc.com/insulation-blog/author/ideal-insulation" }, "dateModified" : "2026-08-16T05:22:29.666Z", "datePublished" : "2026-03-15T12:00:00.000Z", "headline" : "Spray Foam vs Fiberglass vs Blown-In | Best for Florida 2026", "mainEntityOfPage" : { "@id" : "https://www.idealinsulationinc.com/insulation-blog/spray-foam-vs-fiberglass-vs-blown-in-which-is-best-for-florida-homes", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://www.idealinsulationinc.com/hubfs/Untitled%20(1).png" }, "name" : "Ideal Insulation Enterprises Inc" } } ```