Attic Ceiling Insulation R Value

Add insulation to attic.

Attic ceiling insulation r value.

Achieving greater r values in exterior walls. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1. There are many ways to retrofit a home with fiberglass and.

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. 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.

Where you live different climates require different insulation r values. However there is an exception. 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. 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. The higher the r value the better the thermal performance of the insulation. Your home s age if your home is more than 10 year old you likely need more insulation.