What Insulation Do I Use for 2x4 Studs?

Insulation Batts

• Batts of insulation material made of fiberglass or rock wool are among the easiest to install and most cost-effective. The insulation is sold in rolls, sized to the width of the space between the studs, and 4 inches thick. Cut the insulation to length with a utility knife and fit it between the studs. Friction-fit batts are held in place by a friction fit between the studs, while paper-faced insulation is stapled in place through the edges of the paper that extend beyond the insulation.

Loose-Fill Insulation

• Loose-fill insulation is available in a number of materials, including fiberglass and cellulose. Cellulose is made of ground newsprint and is a post-consumer recycled product. Spray these materials into the wall cavity through holes in the sheathing during a remodeling project or place a mesh net over the wall studs and spray the insulation behind the netting. Loose-fill is most commonly used in remodel or renovation projects.

Spray Foam

• Spray foam insulation fills all the cracks and expands to fill the space between the wall studs. The material is more expensive and is most commonly used in small portions of the wall, such as around windows or doors where the studs are placed at less than the full 16 or 24 inches apart.

More Insulation

• Additional insulation can be added by using the proper exterior wall sheathing. Rigid foam boards add additional insulation above the insulating capacity of the materials placed between the studs. The rigid foam insulation is then covered with the desired siding to finish the home.