How to Insulate My Roof


Installing insulation under your roof in your attic can help you reduce your heating and cooling bills. Attics are one of the easiest places in your house to insulate. Fiberglass insulation is the most widely used type of insulation. Take precautions when working with fiberglass; it will make you itch if it touches your skin. Always wear a dust mask, protective eyewear, work gloves, long sleeves and long pants when installing fiberglass insulation.

Things You'll Need

  • Fiberglass insulation batting with vapor barrier
  • Tape measure
  • Utility knife

Determining How Much Insulation You Need

  • Measure the space between each joist in your attic with a tape measure.

  • Measure the length and width of the attic and multiply these numbers to calculate the attic's square footage.

  • Multiply the square footage of the attic by .90 if your joists are spaced 16 inches apart, and by .94 if they are spaced 24 inches apart. These numbers will indicate the square footage of insulation you'll need to cover your attic floor.

Installing Insulation

  • Place the insulation on the floor of the attic with the vapor barrier side down and the fiberglass up.

  • Lay the insulation in sections, beginning at each side of your attic and moving toward the center. Make sure the pieces fit snugly together and that they don't block any vents.

  • Cut scraps of insulation with the utility knife to piece the final sections together as needed.

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  • Photo Credit spiraling insulation image by jbattx from
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