While spray foam offers significant benefits, it's not the only option for home insulation. Blow-in fiberglass cellulose is a loose-fill insulation made from recycled paper products. However, cellulose is not waterproof and can lose its insulating properties if it gets wet. Blow-in cellulose is a cost-effective alternative that offers good insulation properties but requires careful consideration regarding moisture control. It's also important to note that cellulose requires proper ventilation to prevent moisture problems. Here's how it compares to spray foam: