Finished Attic Insulation R Value

Recommended insulation levels for retrofitting existing wood framed buildings.

Finished attic insulation r value.

This means you can have a combined r value ranging from r 23 to r 31 with only 5 1 2 in. Add insulation to attic. Your home s age if your home is more than 10 year old you likely need more insulation. R value measures how well certain building insulation materials can resist heat.

Know exactly how much you need with our project calculators. For homes in the seattle washington area we ve already established that the correct insulation r value climate zone is 4. 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. Where you live different climates require different insulation r values.

The higher the r value the greater the insulation performance. Install air chutes before installing insulation why your roof needs air chutes. Rigid foam sheeting has an r value ranging from r 5 to r 10 per inch of thickness. 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.

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. When determining how much insulation you need don t guesstimate calculate. In addition to climate r value also depends on the age of your home. There are many ways to retrofit a home with fiberglass and.