Attic Ceiling Insulation R Value
While there are additional considerations such as venting and moisture problems to take into account when you insulate under floors the united states department of energy recommends an r 25 rating in cold climates and an r 11 in warmer parts of the country.
Attic ceiling insulation r value. See the department of energy s doe ranges for recommended levels of insulation below. The r value per inch for different types of insulation varies depending on the. Achieving greater r values in exterior walls. R 38 shall be deemed to satisfy the requirement for r 49 wherever the full height of uncompressed r 38 insulation extends over the wall top plate at the eaves.
Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1. Your home s age if your home is more than 10 year old you likely need more insulation. Add insulation to attic.
There are many ways to retrofit a home with fiberglass and. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Recommended insulation levels for retrofitting existing wood framed buildings. The higher the r value the better the thermal performance of the insulation.
However there is an exception. The 2015 irc requires r 49 insulation for ceilings with attic spaces. Where you live different climates require different insulation r values.