Foam Wall Insulation in Charlotte, NC
Superior R-value and complete air sealing in wall cavities. Spray foam wall insulation outperforms fiberglass batts on every measurable dimension -- R-value, air sealing, moisture management, and longevity.
Spray Foam for Exterior Wall Insulation
Exterior wall insulation is critical in Charlotte because walls represent the second-largest surface area of thermal exchange in a typical home, after the attic. Spray foam in wall cavities provides 30 to 50 percent better thermal performance than fiberglass batts at equivalent thickness, and provides complete air sealing that fiberglass simply cannot achieve.
In new construction, open cell foam fills 2x4 and 2x6 wall cavities completely (R-14 in a 3.5-inch cavity, R-20 in a 5.5-inch cavity) and air seals every penetration, wire, and pipe simultaneously. In existing homes, we use injection foam or flash-and-batt techniques to maximize wall performance without demolition.
Charlotte homes built before the 1990s often have minimal or no wall insulation -- especially in older neighborhoods like Dilworth, Plaza Midwood, Myers Park, and Midwood. Spray foam wall insulation can transform the comfort and energy efficiency of these older homes without major renovation.
- R-14 in 2x4 walls and R-20+ in 2x6 walls -- code-compliant performance
- Complete air sealing around every wire, pipe, and penetration
- No gaps, voids, or settlement over time
- Reduces exterior noise transmission into the home
- Appropriate for both new construction and retrofit applications
- Integrates with exterior insulation (rigid foam) for thermal bridge reduction
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Our Process
We follow SPFA (Spray Polyurethane Foam Alliance) installation protocols on every project.
- 1
Wall Assessment
We assess wall cavity depth, existing insulation, exterior cladding type, and any moisture conditions. For retrofit applications, we determine the best access approach.
- 2
Access Preparation
For new construction, foam is applied during framing before drywall. For retrofit, small holes are drilled through interior or exterior cladding to inject foam.
- 3
Safety Setup
Work area prepared, PPE donned. For interior access, furniture and finishes in the work area are protected.
- 4
Foam Application
Open cell foam fills 2x4 and 2x6 cavities; closed cell flash-and-batt is used when maximum R-value in minimal thickness is required. Foam is overfilled and trimmed flush with framing before drywall.
- 5
Patch and Finish
For retrofit, injection holes are patched to match existing finish. Interior holes (if used) are patched with drywall compound.
Frequently Asked Questions
Can spray foam be used in exterior walls of existing homes?
Yes, through an injection foam process. We drill small holes (typically 1.5 to 2 inches) through the exterior siding between studs, inject the foam, and plug the holes. This fills existing wall cavities without demolition.
Should I use open cell or closed cell foam in my walls?
In Charlotte's Climate Zone 3, exterior wall assemblies need careful vapor management. For 2x4 walls, open cell foam provides R-14 but requires a vapor retarder in most assemblies. Closed cell provides R-21+ in 2x4 walls and acts as its own vapor retarder. We assess each project and recommend the appropriate product.
How much does wall spray foam cost in Charlotte?
Open cell spray foam in wall cavities typically costs $1.25 to $2.50 per square foot. Closed cell costs $2.50 to $5.50 per square foot. Injection foam for existing walls varies by access method and typically runs $2.00 to $4.00 per linear foot of wall. Free estimates provided.
Will spray foam wall insulation help with soundproofing?
Yes, noticeably. Open cell spray foam has a higher sound transmission class (STC) rating than fiberglass batts. For interior partition walls between bedrooms, home offices, or home theaters, open cell foam provides meaningful sound reduction.
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