About "Ask the Energy Expert"
Craig Muccio runs FPL's Conservation Research & Development Program and crunches the numbers to figure out how you can save by managing your energy use.
Your questions on energy-related topics can be submitted anytime to our Ask the Energy Expert blog. Just click here to submit your question, and if chosen, it will be answered here
Asked on: December 12, 2012 by Joseph H.; Mims, FL
What is the best way to insulate my attic? Can I install insulation between the rafters?
If your home is more than 30 years old, it may have been built without ceiling insulation. FPL customers who improved their ceiling insulation have seen average savings of $30-$68 per year depending on their previous level of insulation, so you may want to consider the following options for insulating your attic:
Paper backed blankets of fiberglass insulation work well for attics with enough height to work inside. The insulation can be laid between the wooden beams on the attic floor to provide an even level of insulation throughout your home. Choose products with an insulating value of at least R19.
Blown-in insulation works well too. Five inches of blown fiberglass or three inches of cellulose will provide an insulating value of R19. Tell your installer you will be checking to see if they applied an even layer across the entire attic at the end of the job.
Insulating foam can also be sprayed onto the attic ceiling. Spray foam is only recommended for homes with sealed attics and tile, metal, or light color shingle roofs.
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