Finished Attic Insulation R Value

Where you live different climates require different insulation r values.

Finished attic insulation r value. Install air chutes before installing insulation why your roof needs air chutes. This means you can have a combined r value ranging from r 23 to r 31 with only 5 1 2 in. For homes in the seattle washington area we ve already established that the correct insulation r value climate zone is 4. The higher the r value the greater the insulation performance.

Recommended insulation levels for retrofitting existing wood framed buildings. Your home s age if your home is more than 10 year old you likely need more insulation. Know exactly how much you need with our project calculators. Add insulation to attic.

Of combined fiberglass and foam insulation. If you look at the chart above you can see that the attic should achieve an r value between r 38 and r 60 depending on the current insulation levels. In addition to climate r value also depends on the age of your home. When determining how much insulation you need don t guesstimate calculate.

There are many ways to retrofit a home with fiberglass and. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Existing 3 4 inches of insulation. 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.