ANSWERS: 1
  • Houses located in the southern U.S. states should have insulation in their attic totaling an R-value rating of R30 to R60. Middle-latitude states' homes' attics should total R38-R60. In northern states, the total should be R49 to R60. Flooring insulation in the extreme southern states should be R13-R19. This increases to R25-R30 in the northern states.

    Source:

    Energystar.gov

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