Click the button to calculate the depth in inches and pounds of total insulation required for this job.
Blow in attic insulation r value.
Click the button to calculate the approximate r value for this job.
The higher the r value the better the thermal performance of the insulation.
This calculator is to be used as an estimating tool only.
You will need a higher r value of insulation if you live in the northeast than if you live in southern california.
This is because it achieves nominal r value when it fills in the cavities which include the hard to reach in areas voids and gaps.
Achieving the desired r value depends on both the depth of the insulation and its density.
Your home s age if your home is more than 10 year old you likely need more insulation.
Where you live different climates require different insulation r values.
The higher the r value the better the thermal performance of the insulation.
Input length width and desired r value of the area to be insulated.
Recommended home insulation r values.
You d need a thickness of.
As a benchmark one inch of solid wood has an r value of 1.
Achieving greater r values in exterior walls.
There are many ways to retrofit a home with fiberglass and.
Fiber glass insulation typically contains 20 to 30 recycled glass1.
Insulation level are specified by r value.
Blowing the insulation should take less than 1 5 hours and the whole job can be completed in less than 4 hours based on a 1 000 sq.
R value is a measure of insulation s ability to resist heat traveling through it.
This calculator is to be used as an estimating tool only.
Blown in insulation makes it easy to earn a higher grade rating when it comes to r values.
However it s hard to see a home that has batt insulation that doesn t fall short.
The table below shows what levels of insulation are cost effective for different climates and.
Input depth of existing blown in insulation in inches.
In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7.
The r value of loose fill cellulose is r 3 2 to 3 8 per inch2.
When blown into attics and wall spaces loose fill fiberglass offers an average r 2 5 thermal value per inch the higher the number the greater the insulating effect.
Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.
For example a wall with 3 fiberglass batting r value of 10 8 11 9 may have an overall r value of nearly 14 because of siding sheathing and drywall.
So that it can be installed with an insulation blowing machine.