Blow-In Blanket System (BIBS) is a method of insulating walls with blower-injected insulation that can be used for either open or closed walls. On open walls, a fabric sheath or net is attached to studs, providing a type of cage that contains blown-in fiberglass (not cellulose) insulation, in pellets and other forms.

Loose-fill insulation is blown into wall cavities through drilled holes, filling gaps effectively without removing drywall. This method is ideal for adding insulation to existing walls, though it can be messy and requires careful cleanup. Here’s how to insulate your walls with loose-fill insulation:

Drill-and-fill insulation is a popular method for adding insulation to existing walls without removing drywall. This process involves drilling small holes in the wall and blowing in insulation materials like cellulose, fiberglass, or foam.

Both spray foam and cellulose can be blown into the spaces between walls using a small hole and a hose. Once the insulation is blown inside, the little holes can be filled with wood filler, smoothed over, and covered with paint. What is the best insulation to blow in existing walls? Both foam and cellulose insulation can be blown into walls ...

How to insulate existing walls with blown-in fiberglass or cellulose? Follow our step-by-step guide to improve energy efficiency and reduce heat loss.