Attic Insulation

Up to 90% of homes are under insulated.⁴ How much insulation is enough? For our Arizona climate, R-values of R38 (14”) and R60 (22”) are recommended for attic insulation.  

¹ Inorganic glass fiber will not rot or decay, or provide a habitable environment for fungus, mold, or pests.

² Methodology for Estimated Energy Savings from Cost-Effective Air Sealing and Insulating
Savings vary. Find out why in the seller’s fact sheet on R-values. Higher R-values mean greater insulating power.

³ Key Trends in the 2016 Cost vs. Value Report

⁴ Estimate developed by the North American Insulation Manufacturers Association (NAIMA) based on an analysis of the single-family detached residential building stock by Boston University.

⁵ As manufactured, fiber glass insulation is resistant to mold growth. However, mold growth can occur on building materials, including insulation, when it becomes contaminated with organic material and when water is present. To avoid mold growth on fiber glass insulation, remove any water that has accumulated, and correct or repair the source of that water as soon as possible. Insulation that has become wet should be inspected for evidence of residual moisture and contamination, and any insulation that is contaminated should be promptly removed and replaced.