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.
Adequate attic insulation r value.
As a benchmark one inch of solid wood has an r value of 1.
Warmer climates only require an r 38 or higher or about 12 or more.
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 some insulations also depends on temperature aging and moisture accumulation.
When calculating the r value of a multilayered installation add the r values of the individual layers.
Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation.
Recommended insulation levels for retrofitting existing wood framed buildings.
Your home s age if your home is more than 10 year old you likely need more insulation.
Blown in cellulose insulation can carry an r value of 3 2 3 8 per inch of thickness.
Achieving greater r values in exterior walls.
The higher the r value the better the thermal performance of the insulation.
The recommended r value for attic insulation in our area of the country minnesota is 49.
Where you live different climates require different insulation r values.
R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.
Add insulation to attic.
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.
Add the right kind of insulation.
Contact coolray online to figure out the exact level of insulation your atlanta area home needs.
You can achieve better thermal performance in your attic by adding an additional layer of insulation.
Get an estimate and calculate the payback.
Existing 3 4 inches of insulation.
According to the u s.
You will need a higher r value of insulation if you live in the northeast than if you live in southern california.
The higher the r value the better the thermal performance of the insulation.
R value is a measure of insulation s ability to resist heat flow.
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.
There are many ways to retrofit a home with fiberglass and.
