Adequate Attic Insulation R Value

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 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.

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As a benchmark one inch of solid wood has an r value of 1.

Adequate attic insulation r value.

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 depends on the type of insulation its thickness and its density. Recommended insulation levels for retrofitting existing wood framed buildings. 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.

Get an estimate and calculate the payback. Where you live different climates require different insulation r values. 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. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.

Existing 3 4 inches of insulation. Warmer climates only require an r 38 or higher or about 12 or more. You can achieve better thermal performance in your attic by adding an additional layer of insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

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 the right kind of insulation. The higher the r value the better the thermal performance of the insulation. When calculating the r value of a multilayered installation add the r values of the individual layers.

Add insulation to attic. Contact coolray online to figure out the exact level of insulation your atlanta area home needs. Your home s age if your home is more than 10 year old you likely need more insulation. According to the u s.

R value is a measure of insulation s ability to resist heat flow. The r value of some insulations also depends on temperature aging and moisture accumulation. Blown in cellulose insulation can carry an r value of 3 2 3 8 per inch of thickness. Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation.

Achieving greater r values in exterior walls. There are many ways to retrofit a home with fiberglass and. 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.