Finished Attic Insulation R Value

The higher the r value the greater the insulation performance.

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. 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. Where you live different climates require different insulation r values.

Recommended insulation levels for retrofitting existing wood framed buildings. 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. Know exactly how much you need with our project calculators. In addition to climate r value also depends on the age of your home.

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. Of combined fiberglass and foam 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.

Existing 3 4 inches of insulation. R value measures how well certain building insulation materials can resist heat. Add insulation to attic. This means you can have a combined r value ranging from r 23 to r 31 with only 5 1 2 in.