Attic Ceiling Insulation R Value
There are many ways to retrofit a home with fiberglass and.
Attic ceiling insulation r value. Where you live different climates require different insulation r values. Achieving greater r values in exterior walls. 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. 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.
You can achieve better thermal performance in your attic by adding an additional layer of insulation. See the department of energy s doe ranges for recommended levels of insulation below. Recommended insulation levels for retrofitting existing wood framed buildings. The 2015 irc requires r 49 insulation for ceilings with attic spaces.
The higher the r value the better the thermal performance of the insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. 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. The r value per inch for different types of insulation varies depending on the.
Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. Existing 3 4 inches of insulation.
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