Wall Insulation
Hot walls mean a hot house. Cardinal insulates wood-frame and concrete-block walls across Boca Raton, Delray Beach, Boynton Beach, West Palm Beach, and Parkland — from dense-pack cellulose retrofits drilled through existing walls, to closed-cell foam in coastal block cavities, to continuous exterior insulation on new builds. The right method depends on your wall type, and we spec it on site.
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
Wall Insulation for South Florida Properties
wall 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.
Wall Insulation at a glance
- R-value
- R-13 to R-21 (cavity) · R-3.0 to R-6.5 (continuous exterior)
- Installed cost
- $1.50 – $5.00 per sq ft installed
- Service life
- 25–80+ years depending on method
- Available in
- South Florida and throughout South Florida
Types and Methods
Dense-pack cellulose retrofit
For existing wood-frame walls, we drill small access holes through the exterior or interior, blow cellulose into the cavity at 3.5 lb/ft³ so it cannot settle, then patch and finish. No full demo required — the only practical way to insulate a finished wall without opening it up.
Closed-cell foam in block cavities
For concrete block (CBS) homes common in South Florida, we fill the block cores with closed-cell spray foam. This adds R-value and a moisture barrier inside the wall — far more effective than the empty cores most older CBS homes have.
Continuous exterior insulation
Rigid foam board installed on the exterior of the wall framing, breaking thermal bridging at every stud. This delivers the full rated R-value and is required by code for many new construction assemblies in Florida.
The right wall insulation method depends on your wall type — wood frame, concrete block, or hybrid. We inspect on site and spec the correct approach. We never recommend a method that doesn't match the assembly.
Benefits for South Florida Property Owners
- Dense-pack retrofit fills existing walls with no full demo — drilled and patched.
- Closed-cell foam in block cavities adds R-value and a moisture barrier.
- Continuous exterior insulation breaks thermal bridking at every stud.
- Cuts radiant heat gain through south and west-facing walls.
- Reduces HVAC load and evens out hot rooms year-round.
Best Applications
- Existing wood-frame walls with no insulation
- Concrete block (CBS) homes with empty block cores
- South and west-facing walls with high radiant heat gain
- New construction aiming for above-code performance
- Rooms that stay hot despite adequate attic insulation
How We Install It
- 1Inspect the wall assembly — wood frame, block, or hybrid — to determine the right method
- 2FLIR-scan the wall to document existing voids and thermal bridges
- 3For dense-pack: drill access holes, blow cellulose, patch and finish
- 4For block fill: drill core access, spray closed-cell foam, patch
- 5For continuous exterior: install rigid foam board, tape seams, flash
- 6Seal all penetrations — outlets, switches, and plumbing
- 7FLIR-scan to verify the fill and document the thermal improvement
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.
Wall Insulation FAQs
Wall insulation across the corridor runs $1.50–$5.00 per square foot depending on method — fiberglass batt in open cavities is least, dense-pack cellulose retrofit is mid-range, and closed-cell foam in block walls is most. Get an instant quote by ZIP.
Yes. Dense-pack cellulose is drilled through small exterior or interior holes, blown under pressure to fill the cavity, then patched — no full demo. It's the standard retrofit for existing wood-frame walls across South Florida.
Concrete block (CBS) homes are common in Boca and the corridor. We fill the block cores with closed-cell spray foam or pour-in insulation, which adds R-value and a moisture barrier inside the wall — far more effective than nothing, which is what most older CBS homes have.
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.
