How to Estimate Insulation in Attic & Walls

Estimating the proper amount of insulation and the correct R-value for a home results in the benefit of reduced utility bills once the insulation is installed. Air leaks in walls and attics allow cold air into the home in the winter and warm, heated air to escape. This causes the heating unit to work overtime while attempting to regulate a comfortable temperature. Insulation is also vital during hot months to prevent air-conditioned air from seeping out through the walls and attic.

Measuring tape
Calculator

Instructions

- 1
  Pick insulation that is appropriate for the attic or wall space. Insulation blankets or batts are suitable for attic walls, while blown-in loose fill works well for attic ceilings. Rigid board or blown-in insulation is appropriate for the exterior or interior walls of a home.
- 2
  Measure the length and width of the walls or attic spaces with a measuring tape to determine how much insulation will be required. If the attics or walls have irregular shaped spaces, measure them individually, then add this to the totals to determine the square feet necessary.
- 3
  Multiply the total length times the total width to determine how much square footage of the insulation is necessary.
- 4
  Add insulation that equals the R-value that is necessary to achieve the recommended goal of 44 to 50 in new homes. In an older home with an attic, the insulation needs are at least a 38 R-value, as stated by Madison Gas and Electric Co. of Madison, Wis. If the insulation that exists in the attic is 2 inches thick, an application of an R-value of 32 is required. For 4 inches, an R-26 and for 8 inches an R-value of 14 is necessary.

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