Finished Attic Insulation R Value

Add insulation to attic.

Finished attic insulation r value.

The higher the r value the greater the insulation performance. Existing 3 4 inches of insulation. Rigid foam sheeting has an r value ranging from r 5 to r 10 per inch of thickness. When determining how much insulation you need don t guesstimate calculate.

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

For homes in the seattle washington area we ve already established that the correct insulation r value climate zone is 4. 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. Of combined fiberglass and foam insulation. Know exactly how much you need with our project calculators.

There are many ways to retrofit a home with fiberglass and. Where you live different climates require different insulation r values. 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. In addition to climate r value also depends on the age of your home.