San Diego attics need R-30 to R-38 in new homes and R-49 when an inland, mountain or desert attic is altered, depending on climate zone 7, 10, 14 or 15. Coastal zone 7 upgrades only require R-19, but ENERGY STAR recommends R-38 to R-49.
For most San Diego attics, blown-in cellulose or loose-fill fiberglass to R-38 to R-49, with air sealing first, is the best value. Spray foam wins when ducts run through the attic, the roofline is complex, or air leakage is severe.
Six San Diego attic cleaning and insulation providers, compared on scope, coverage, inspection process and fit. We publish this guide and we rank ourselves first, for the reason below. Check every provider's license and written scope before you book.
