This is a hybrid insulation job with spray foam on all exterior walls and roofline, and batted fiberglass insulation on interior walls. This creates an insulation envelope, keeping all heated or cooled air in, while regulating temperatures from room to room. Why install a spray foam envelope? ✅Lowers energy bills by up to 50% ✅ Superior air sealing, closing all gaps and cracks that air can pass through ✅Healthier indoor air quality ✅Stronger, quieter, more durable walls and roof ✅Long lasting pe