Energy Saving Devices

Loose-fill insulation can be installed in either enclosed cavities, such as walls, or unenclosed spaces, such as attics. Installation usually involves using special equipment that blows the insulation through and into the cavity or space. This includes the “two-hole method,” which entails drilling two holes spaced vertically between the exterior walls’ framing studs. The holes should be 2 inches (5 centimeters) in diameter. Working between each stud, drill one hole 16 inches (41 centimeters) from the top of the wall. Drill the other hole 24 inches (61 centimeters) from the bottom of the wall. Blow the insulation into the holes and then seal the installation holes. In conventional and cathedral ceilings, insulation is easier to blow in if an access opening through the ceiling already exists. Otherwise, it may be necessary to drill holes in the ceiling or between the roof rafters.

Installation is most commonly done by professionals who are experienced at operating the equipment to ensure proper density and complete coverage. If you’d like to have the insulation installed professionally, you should do the following:

* Obtain written cost estimates from several contractors for the R-value you need. Don’t be surprised to find quoted prices for a given R-value installation to vary by more than a factor of two.

* Ask contractors about their air-sealing services and costs as well, if needed.

If you want to install it yourself, you should try to obtain instructions and safety precautions from the insulation manufacturer. Carefully follow these instructions. You should also check your local building and fire codes.

Source: EERE, U.S. Department of Energy