White Blown In Insulation R Value

This calculator is to be used as an estimating tool only.

White blown in insulation r value.

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. The common denominator among varieties of insulation is the r value. The insulation usually is blended and provides an r value ranging from around 32 to 38 per square foot. Input depth of existing blown in insulation in inches.

Loosely blown fiberglass alone carries an r value of about 22 to 27 per square foot. When installed as solid panels its r value can vary from 2 5 to 3 6 depending on the particular style. 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. 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. Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. Nothern white fibre glass blowing insulation. Because paper is flammable cellulose insulation needs to be treated with borate and or ammonium sulfate so that it can be used safely.

Click the button to calculate the approximate r value for this job. 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. Insulation depth depending on your climate energy codes require varying r values for ceiling insulation. Achieving the desired r value depends on both the depth of the insulation and its density.

Mineral wool that is blown in also has an r value of 2 5 whereas mineral wool batts have an r value of 3. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Northern white fibre glass blowing insulation is used in residential and commercial construction as a thermal and acoustical insulation. However we rarely see a home with batt insulation that doesn t fall short.

The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. As a benchmark one inch of solid wood has an r value of 1. 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 in insulation often is a combination of loose fiberglass and treated cellulose fibers.

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. A bag of cellulose runs about 11 50 and will cover 36 7 square feet at a.