The Science of Experience



Keep AC Costs Down with a Well-Insulated Attic

Posted by Emillie Lee

May 11, 2016 11:30:00 AM


Building energy-efficient homes requires careful attention to insulation and sealing, especially in the attic. Unfortunately, this is an area that a lot of contractors and homeowners overlook when trying to make homes more sustainable. In the summer months, a properly insulated attic greatly reduces your air conditioning costs. The money you spend on the added insulation is easily recouped in as little as one season. This is because the insulation keeps the air around your air conditioning ducts cool, so they deliver colder air and the condenser does not have to work as hard.

Insulating an attic is not a difficult process, especially if you are familiar with home construction and repairs. Here is a look at the basic steps.

  1. Measure the thickness of your current insulation, and than calculate its R value by multiplying its thickness by the R-value per inch. For fiberglass, the R-value per inch is 3.2. For spray foam, the R-value per inch is 5.9.

  2. Take a look at the U.S. Department of Energy's recommendations for R value, and calculate how much additional insulation you need to meet the recommendations for your zone.

  3. Contact a spray foam applicator in your area to apply additional attic insulation. If you have fiberglass insulation in your attic, now is the perfect time to change over. Most operators will remove the fiberglass before applying the spray foam.

At NCFI Polyurethanes, we specialize in spray foam insulation that can reduce energy costs and keep homes cooler in the summer months. Contact us for more information about our equipment sales, rentals and training for building energy-efficient homes.

Topics: Energy Efficiency, R-Value, Attic