R-value measures how well insulation resists heat flow. The higher the R-value, the better the insulation. Florida Building Code requires a minimum of **R-38** for attic spaces — roughly 10–12 inches of blown-in fiberglass.
Most older Florida homes were built with R-11 (3.5 inches) to R-19 (6 inches) — well below today's requirement. If your home is more than 15 years old and hasn't had an insulation upgrade, there's a good chance you're under-insulated.
R-38 is the minimum, but it's not necessarily the maximum. Homes in Central and South Florida that see intense summer heat may benefit from R-49 or higher, especially in heavily sun-exposed attics.
The good news: going from R-11 to R-38 with blown-in fiberglass is a straightforward job that typically takes a few hours. Florida Attics provides instant online quotes based on your attic square footage — no home visit required for pricing.