The average recommended level is 17 inches of r60.
Minimum attic insulation r value.
There are many ways to retrofit a home with fiberglass and.
You will need a higher r value of insulation if you live in the northeast than if you live in southern california.
Recommended home insulation r values.
Warmer climates only require an r 38 or higher or about 12 or more.
Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation.
In zone 2 the average minimum requirement for attic insulation is 9 inches of r30 fill.
The higher the r value the better the thermal performance of the insulation.
How much insulation in attic for zones 1 4.
The insulation levels of an attic or of any part of a house are understood through the r value that is the value with which the insulating material is resistant to heat flow.
The average recommended level is 14 inches of r49.
Where you live different climates require different insulation r values.
Insulation level are specified by r value.
For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3.
The table below shows what levels of insulation are cost effective for different climates and.
Your home s age if your home is more than 10 year old you likely need more insulation.