Finished Attic Insulation R Value

In addition to climate r value also depends on the age of your home.

Finished attic insulation r value.

The higher the r value the greater the insulation performance. For homes in the seattle washington area we ve already established that the correct insulation r value climate zone is 4. R value measures how well certain building insulation materials can resist heat. Where you live different climates require different insulation r values.

There are many ways to retrofit a home with fiberglass and. 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. Recommended insulation levels for retrofitting existing wood framed buildings. Existing 3 4 inches of insulation.

Your home s age if your home is more than 10 year old you likely need more 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. Rigid foam sheeting has an r value ranging from r 5 to r 10 per inch of thickness. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

Know exactly how much you need with our project calculators. 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. Add insulation to attic.