OPEN CELL RETROFIT INJECTION FOAM INVEST IN YOUR HOME AirTight™ Retrofit Foam Insulation adds tremendous R-value to exterior walls, achieving up to R-13 in 2 x 4 walls and up to R-21 in 2×6 walls. Additionally, AirTight™ Retrofit Foam Insulation reduces energy use in buildings beyond its stated R-value because AirTight™ Retrofit Foam: • Reduces … Continue reading Retrofit