Ceiling Insulation R Value Requirements

Does your home have enough r value.

Ceiling insulation r value requirements.

Where you live different climates require different insulation r values. Recommended insulation levels for retrofitting existing wood framed buildings. The 2015 irc requires r 49 insulation for ceilings with attic spaces. Existing 3 4 inches of insulation.

Injection foam insulation s higher r value with an r value of 4 0 to 5 1 per inch depending on the manufacturer pre expanded injection foam provides a higher r value than fiberglass or cellulose and it seals the building from air leakage at the same time. 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. 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. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3.

Ceilings pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1. See the department of energy s doe ranges for recommended levels of insulation below. 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. Your home s age if your home is more than 10 year old you likely need more insulation.

There are many ways to retrofit a home with fiberglass and. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.