As a benchmark one inch of solid wood has an r value of 1.
Attic insulation r value chart canada.
R value is a measure of insulation s ability to resist heat traveling through it.
How much insulation should you install.
Where you live different climates require different insulation r values.
Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.
Recommended home insulation r values.
Insulation level are specified by r value.
The higher the r value the better the thermal performance of the insulation.
In such cases where r value is assigned this may decrease the r value requirement for batt insulation.
Note from this chart that the ideal r value differs for each part of your home.
In general to optimally isolate an attic on average an r value of the insulation is required ranging from r 50 to r 60.
You will need a higher r value of insulation if you live in the northeast than if you live in southern.
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.
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 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.
Chart courtesy of energy star.