When insulating a Florida attic, you'll typically choose between blown-in insulation (loose-fill fiberglass or cellulose) and batt insulation (pre-cut fiberglass blankets). For most Florida attics, blown-in is the clear winner.
Blown-in fiberglass fills every gap, crack, and irregular space in your attic — including around joists, wiring, and pipes. It achieves uniform coverage with no thermal bridging gaps, which is critical in Florida's intense heat. Installation is fast (1–3 hours), and settled R-values are stable over time.
Batt insulation is cut in standard widths and must be manually fitted around every obstruction. In older Florida homes with complex attic layouts, batts almost always leave gaps that severely reduce real-world performance. Batts are also more susceptible to moisture damage and compression.
The verdict: blown-in fiberglass is the preferred choice for Florida attic insulation. It performs better, installs faster, resists moisture better, and is typically the same price or cheaper per R-value than batt insulation. Florida Attics exclusively uses blown-in fiberglass for attic floor installations.