According to the u s.
Adequate attic insulation r value.
You will need a higher r value of insulation if you live in the northeast than if you live in southern california.
Add insulation to attic.
Your home s age if your home is more than 10 year old you likely need more insulation.
The higher the r value the better the thermal performance of the insulation.
There are many ways to retrofit a home with fiberglass and.
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.
Warmer climates only require an r 38 or higher or about 12 or more.
Fiberglass and cellulose insulation have r values of 2 9 to 3 8 per inch while sprayed foam insulation can go as high as 8 0 per inch.
Achieving greater r values in exterior walls.
Add the right kind of insulation.
The recommended r value for attic insulation in our area of the country minnesota is 49.
The r value of some insulations also depends on temperature aging and moisture accumulation.
Recommended insulation levels for retrofitting existing wood framed buildings.
The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.
When calculating the r value of a multilayered installation add the r values of the individual layers.
Existing 3 4 inches of insulation.
R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.
As a benchmark one inch of solid wood has an r value of 1.
But on average a home needs 10 14 inches r 38 of insulation as you can see from this image from energystar go v georgia is a combination of zones 2 3 and 4.
To give you a quick example if you blow in 18 of insulation into your attic with an r value of 3 0 per inch you ve got an effective r value of 3 x 18 54.
You can achieve better thermal performance in your attic by adding an additional layer of insulation.
Get an estimate and calculate the payback.
Where you live different climates require different insulation r values.
Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation.
Contact coolray online to figure out the exact level of insulation your atlanta area home needs.
Department of energy it s recommended that attics have an r 38 to r 49 or about 12 to 15 of fiberglass or cellulose insulation.
The r value depends on the type of insulation its thickness and its density.
