Adequate Attic Insulation R Value

The r value depends on the type of insulation its thickness and its density. 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.

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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.

Adequate attic insulation r value.

There are many ways to retrofit a home with fiberglass and. Recommended insulation levels for retrofitting existing wood framed buildings. The recommended r value for attic insulation in our area of the country minnesota is 49. Warmer climates only require an r 38 or higher or about 12 or more.

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 of some insulations also depends on temperature aging and moisture accumulation. 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. Blown in cellulose insulation can carry an r value of 3 2 3 8 per inch of thickness.

The higher the r value the better the thermal performance of the insulation. You can achieve better thermal performance in your attic by adding an additional layer of insulation. R value is a measure of insulation s ability to resist heat flow. 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.

When calculating the r value of a multilayered installation add the r values of the individual layers. As a benchmark one inch of solid wood has an r value of 1. Get an estimate and calculate the payback. 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.

According to the u s. 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. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Existing 3 4 inches of insulation. Achieving greater r values in exterior walls. Add insulation to attic.

Add the right kind of insulation. The higher the r value the better the thermal performance of the insulation. Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation.