Attic Ceiling Insulation R Value

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. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Where you live different climates require different insulation r values.

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Attic ceiling insulation r value.

Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1. 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. The higher the r value the better the thermal performance of the insulation.

There are many ways to retrofit a home with fiberglass and. However there is an exception. 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. The 2015 irc requires r 49 insulation for ceilings with attic spaces.

Add insulation to attic. 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. Your home s age if your home is more than 10 year old you likely need more insulation. The r value per inch for different types of insulation varies depending on the.

Existing 3 4 inches of insulation. Achieving greater r values in exterior walls. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

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