Which insulation is the cheapest?
Overall, fibreglass insulation is the cheapest and most effective insulation option available, making it a popular choice for homeowners and builders alike. What time of year is insulation cheapest? Install insulation during spring and early fall to save money and gain scheduling flexibility.
What is the cheapest insulation per square foot?
Fiberglass Insulation: The most budget-friendly choice (~$0. R-value performance. Ideal for walls, attics, and floors. Cellulose Insulation: Affordable and eco-friendly (~$0. Average Cost of Attic Insulation Installation Attic insulation installation ranges from $1. The average cost of attic insulation installation is $1.Traditional fiberglass insulation costs approximately $0. More expensive materials like polystyrene may cost between $1.