Blow-in blanket (BIB) insulation is a type of insulation that combines the benefits of loose-fill insulation with the convenience of a blanket or batt form. It is also commonly referred to as blow-in insulation or blown-in insulation. BIB insulation is typically composed of loose fibers or fiber pellets made from materials such as fiberglass, cellulose, or mineral wool.

Where to put BIBS and why?

A good place to use BIBS is a house downtown or a sudivision where there is a lot of outside noise wall closest to a road, because BIBS provides better sound proofing than the traditional batt product. You also get a 15% better R-value than batts. Because it is a custom fit product, BIBS is also good for stud spaces that have a lot of wires and other objects that would make batts difficult.

Here are some key features and aspects of Blow-in Blanket insulation:

Installation Process: BIB insulation is installed using a blowing machine that propels the loose-fill insulation material into walls, attics, or other spaces. This method allows for efficient and uniform coverage, reaching areas that might be challenging with traditional batt insulation.

Versatility: Blow-in blanket insulation is highly versatile and can be used in various applications, including attics, walls, and crawl spaces. It conforms well to irregular shapes and fills gaps and voids, providing effective coverage.

Materials: The most common materials used for BIB insulation include fiberglass, cellulose, and mineral wool. Fiberglass BIB typically consists of recycled glass fibers, while cellulose BIB is made from recycled paper or other plant-based fibers. Mineral wool BIB is composed of rock or slag fibers.

Energy Efficiency: Blow-in blanket insulation enhances the energy efficiency of a home by reducing heat transfer. It helps to maintain a more consistent indoor temperature, lowering heating and cooling costs.

Fire Resistance: Depending on the material used, BIB insulation can offer fire resistance. For example, fiberglass and mineral wool are inherently non-combustible materials.

Moisture Control: Some types of BIB insulation, particularly fiberglass and mineral wool, are resistant to moisture and mold growth. This can contribute to better indoor air quality and prevent issues related to dampness.

When considering blow-in blanket insulation for your home, it’s essential to consult with a professional insulation installer to determine the most suitable material and application for your specific needs. Proper installation is crucial to achieving the desired energy efficiency and comfort improvements in your home.


  • Sound dampening
  • Higher r value than batts
  • More variety of products available
  • Conforms well to irregular shape


  • Only for new builds with ofr stud space
  • Must be pre sheetrock
  • Makes retrofit projects like adding wires difficult due to the loose fill
  • BIBS can’t get wet
  • The installation process can take 1-2 days extra