Finished Attic Insulation R Value

You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

Finished attic insulation r value.

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. When determining how much insulation you need don t guesstimate calculate. For homes in the seattle washington area we ve already established that the correct insulation r value climate zone is 4. Recommended insulation levels for retrofitting existing wood framed buildings.

Know exactly how much you need with our project calculators. There are many ways to retrofit a home with fiberglass and. The higher the r value the greater the insulation performance. Install air chutes before installing insulation why your roof needs air chutes.

Of combined fiberglass and foam insulation. Your home s age if your home is more than 10 year old you likely need more insulation. Rigid foam sheeting has an r value ranging from r 5 to r 10 per inch of thickness. This means you can have a combined r value ranging from r 23 to r 31 with only 5 1 2 in.

Where you live different climates require different insulation r values. R value measures how well certain building insulation materials can resist heat. 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.