A home or garage has many places that may require insulation and include the ceiling. Access an attic or crawlspace to reach the ceiling in your house or garage. A typical ceiling has rafters that span the width of the house that are usually covered on the bottom side with drywall. Installing insulation should be done shortly after a new ceiling has been installed.
Instructions
1. Determine what type of insulation to use. A ceiling with rafters can be insulated using fiberglass batts that are bundled rolls 6 inches to 8 inches thick.
2. Determine the appropriate R-value that will suit your needs. Use the form on the Department of Energy's website (see Resources) to find the R-value that is recommended.
3. Measure the spacing between the rafters in the ceiling. The standard width is typically 16 inches. Anything less will require cutting the insulation to make it fit properly.
4. Measure the length of the rafter to determine how long a piece of insulation will be needed. Use a utility knife to cut the required length of insulation.
5. Place the insulation between the studs in the rafter. Use a to cut the insulation to fit around air ducts and pipes.
6. Repeat Steps 4 and 5 until the ceiling has been completely insulated.
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