Fiberglass Batt Insulation
Fiberglass batts remain the most cost-effective way to insulate accessible framing — open wall cavities, floor joists, and knee walls where blown-in or foam can't reach. Cardinal installs faced and unfaced fiberglass batts to code R-value across Boca Raton, Delray Beach, Boynton Beach, West Palm Beach, and Parkland, cut and fit tight so there are no gaps, voids, or compression that kill R-value.
Get Your Free Quote
Itemized pricing by zone, back to you within the hour. No call required.
ProPink fiberglass, installed to manufacturer spec
Before-and-after infrared proof on every job
Local crews, never subcontracted
Transferable to the next owner
Fiberglass Batt Insulation for South Florida Properties
fiberglass batt insulation is the workhorse of Florida attic retrofits. We will tell you plainly when it is the right specification and when a less expensive approach delivers the same outcome.
South Florida sits in South Florida, where the recommended attic target is R-38 to R-49. That number, along with where your ductwork runs and what condition the existing assembly is in, is what determines the right specification for your property.
Fiberglass Batt Insulation at a glance
- R-value
- R-3.1 to R-4.3 per inch · R-13 to R-30 per batt
- Installed cost
- $0.90 – $2.10 per sq ft installed
- Service life
- 25+ years
- Available in
- South Florida and throughout South Florida
Types and Methods
Faced fiberglass batts
Fiberglass batts with a kraft paper or foil vapor retarder on one side. The facing goes against the warm side of the cavity — useful in humid South Florida walls where vapor control matters. Available in R-13 to R-30 for standard wall and floor framing.
Unfaced fiberglass batts
Fiberglass batts with no vapor retarder, used when a separate vapor barrier exists or in interior partitions for sound control. We install them in interior walls, floors between levels, and knee walls where vapor control is handled elsewhere.
Fiberglass batts only deliver their rated R-value when they are cut and fit tight — gaps, compression, and voids kill the performance. We cut every batt to the exact cavity dimension and split around wiring and plumbing so there are no voids.
Benefits for South Florida Property Owners
- Lowest cost per R-value of any insulation — affordable code compliance.
- Faced batts include a built-in vapor retarder for humid South Florida walls.
- Ideal for open wall cavities, floor joists, and knee walls during remodels.
- Non-combustible — fiberglass won't burn or contribute to flame spread.
- Fast installation in accessible framing — no cure time, no off-gassing.
Best Applications
- Open wall cavities during remodels
- Floor joists and knee walls
- Interior partitions for sound control
- Budget-conscious code compliance
- Accessible framing where blown-in can't reach
How We Install It
- 1Measure each cavity and select the correct R-value batt
- 2Cut batts to fit tight — no gaps, no compression, no voids
- 3Install with the vapor retarder facing the warm side
- 4Staple flanges to the face of the framing or friction-fit into the cavity
- 5Seal around electrical boxes, plumbing, and penetrations with caulk or foam
- 6Verify no compression at wiring or plumbing — split the batt if needed
- 7Walk the job and verify every cavity is filled to full R-value
Cost and R-Value Reference
Florida insulation cost & R-value reference.
Typical installed costs across South Florida by material. Pricing varies with access, square footage, and site conditions — every Cardinal quote itemizes material, R-value, installed inches, and square footage.
| Material | Installed cost | R-value / inch | Service life |
|---|---|---|---|
| Blown-in fiberglass | $1.10 – $2.00 / sq ft | R-2.2 – R-2.7 / in | 20–30 years |
| Blown-in cellulose | $1.20 – $2.40 / sq ft | R-3.2 – R-3.8 / in | 20–30 years |
| Fiberglass batts | $0.90 – $2.10 / sq ft | R-3.1 – R-3.4 / in | 25+ years |
| Mineral wool | $1.60 – $3.40 / sq ft | R-3.0 – R-4.3 / in | 50+ years |
| Open-cell spray foam | $1.50 – $3.20 / sq ft | R-3.6 – R-3.8 / in | 80+ years |
| Closed-cell spray foam | $2.40 – $4.90 / sq ft | R-6.0 – R-7.0 / in | 80+ years |
| Rigid foam board | $1.40 – $3.80 / sq ft | R-3.8 – R-6.5 / in | 50+ years |
| Radiant barrier | $0.55 – $1.90 / sq ft | Reflective (no R) | 25+ years |
| Duct sealing + R-8 wrap | $800 – $3,500 / system | R-8 (duct) | 15–25 years |
| Insulation removal | $1.10 – $2.90 / sq ft | — | One-time |
Pricing reflects typical Florida installed costs and varies with access, square footage, and site conditions. Source: U.S. Department of Energy insulation guidance, Florida Building Code R402, and IECC climate zone 1 requirements.
Pricing reflects typical Florida installed costs and varies with access, square footage and site conditions.
Fiberglass Batt Insulation FAQs
Fiberglass batt installation across the corridor runs $1.00–$2.50 per square foot installed, depending on R-value (R-13 to R-30), faced vs unfaced, and cavity access. It's the most budget-friendly way to hit code R-value. Get an instant quote by ZIP.
Faced batts (kraft or foil) include a vapor retarder and go against the warm side of the cavity — useful in humid South Florida walls. Unfaced batts are used when a separate vapor barrier exists or in interior partitions for sound. We spec both based on the assembly.
For air sealing and moisture, no — spray foam outperforms. But for budget-conscious projects in accessible framing, properly installed fiberglass batts deliver solid R-value at a fraction of the cost. We'll tell you honestly where each makes sense on your home.
Serving the Boca–Delray–Boynton corridor.
From the Boca inlet to Boynton's western estates — every hot zone below is a home we sealed this year. This is our local service area.
