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Insulation Cost Calculator

Florida insulation costs $1.20 to $6.50 per square foot installed depending on type (blown fiberglass vs spray foam) and target R-value. For a typical 1,800 sqft FL attic, blown fiberglass to R-49 runs $2,000–$4,500; closed-cell spray foam runs $9,000–$15,000 for a full conditioned-attic conversion. This calculator factors in FL Climate Zone 2 code minimums and the energy-payback math for both approaches.

Insulation cost calculator

FL Climate Zone 2 install rates, with foam vs fiberglass options. Updates as you type.

Low end
$2,218
Typical
$3,283
High end
$4,882
About $1.27/sqft typical for material + install. Air sealing adds ~$990.

How to use this calculator

  1. Enter your attic or insulation area in square feet. For a whole-house attic, use heated/cooled footprint.
  2. Choose insulation type. Blown fiberglass is the cheapest top-up; closed-cell spray foam is the premium retrofit choice.
  3. Pick a target R-value. FL Climate Zone 2 code minimum is R-38; most contractors recommend R-49 for energy efficiency.
  4. Toggle air sealing — this is recommended for any attic retrofit and seals top-plate, recessed-light, and AC register penetrations.
  5. Toggle 'remove existing' if your current insulation is wet, contaminated, or rodent-damaged — vacuuming out old insulation costs $1–$2 per sqft.
Numbers updated quarterly
Material rates and labor multipliers come from BuildPriced's internal contractor quote dataset and published industry reports. Last reviewed 2026-05-09.

Calculator FAQs

Is closed-cell foam really worth 3× the price of blown fiberglass?

In FL homes with AC ducts in the attic, often yes. Closed-cell foam on the roof deck converts the attic to a conditioned space, which lets the ducts deliver full AC capacity instead of losing 15–25% to a 130°F attic. The energy payback is usually 9–13 years. For homes without attic ducts, foam's ROI is smaller and blown fiberglass is the right call. Talk to a FL energy contractor (not just an insulation contractor) about your specific home.

What R-value do I actually need for Florida?

FL Building Code Climate Zone 2 minimum is R-38 attic insulation. Most FL contractors recommend R-49 because the energy savings versus R-38 typically pay back the modest cost difference within 4–6 years in FL's hot climate. Going above R-49 has diminishing returns — R-60 is appropriate for very high-efficiency homes but the cost-per-R is harder to justify.

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