Insulation costs in Charlotte run $1.50–$5.00/sq ft depending on material and application.
Fiberglass batts (most affordable): $0.50–$1.00/sq ft installed. R-13 walls, R-38 attic. Adequate but doesn't seal air gaps. Total for 3,000 sq ft home: $4K–$8K.
Blown-in cellulose/fiberglass (attic): $1.00–$1.50/sq ft. Better coverage than batts, fills gaps. Attic-only: $1,500–$3,000.
Closed-cell spray foam: $3.00–$5.00/sq ft. Superior air sealing and moisture barrier — critical in Charlotte's humid climate. Also adds structural rigidity. Total for 3,000 sq ft home: $8K–$15K. Higher cost but provides the best thermal and moisture performance.
Open-cell spray foam: $1.50–$2.50/sq ft. Good air sealing, lower R-value per inch than closed-cell. Good option for interior walls and attics. Total: $5K–$10K.
Charlotte energy code requires minimum R-38 attic and R-13 or R-15 walls. Spray foam exceeds these minimums and provides superior comfort — many Charlotte builders now spec spray foam as standard for walls and roofline.
Moisture consideration: Charlotte averages 43 inches of rain and high summer humidity. Closed-cell spray foam serves as both insulation and vapor barrier, preventing moisture problems that plague conventionally insulated Charlotte homes.