Click the button to calculate the approximate r value for this job.
White blown in insulation r value.
Loosely blown fiberglass alone carries an r value of about 22 to 27 per square foot.
Cellulose is denser than blown in fiberglass so it has a better r value about 3 2 to 3 8 per inch however it does settle and flatten over time losing some of that insulating value.
Achieving the desired r value depends on both the depth of the insulation and its density.
As a benchmark one inch of solid wood has an r value of 1.
The r value of loose fill cellulose is r 3 2 to 3 8 per inch2.
Insulation depth depending on your climate energy codes require varying r values for ceiling insulation.
Mineral wool that is blown in also has an r value of 2 5 whereas mineral wool batts have an r value of 3.
That s because insulation can only achieve its nominal r value when it fills all framing cavities including hard to reach and sometimes hidden gaps and voids.
Blown insulation makes it much easier to earn a grade 1 hers rating.
A bag of cellulose runs about 11 50 and will cover 36 7 square feet at a.
Nothern white fibre glass blowing insulation.
Blown in insulation often is a combination of loose fiberglass and treated cellulose fibers.
Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3.
Cellulose insulation has an average thermal value of r 3 7 so you d need just over five inches to equal an r 19 batt.
It is designed for pneumatic installation in open attic or ceiling plenum areas with flat flooring or up to a maximum slope of 4 5 12.
Because paper is flammable cellulose insulation needs to be treated with borate and or ammonium sulfate so that it can be used safely.
However we rarely see a home with batt insulation that doesn t fall short.
When installed as solid panels its r value can vary from 2 5 to 3 6 depending on the particular style.
Northern white fibre glass blowing insulation is used in residential and commercial construction as a thermal and acoustical insulation.
This calculator is to be used as an estimating tool only.
R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.
In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and.
The depth and thickness of the blown insulation affect the r value.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
The insulation usually is blended and provides an r value ranging from around 32 to 38 per square foot.
Fiberglass when installed loosely has an r value of 2 5.