Best R Factor For Attic Insulation

An insulation r value chart or table can assist you with the calculation to ensure your attic or wall r values are adequate for your particular zone. Call 513 341 8918 or contact us online today for expert insulation services in the cincinnati ohio area. Recommended insulation levels for retrofitting existing wood framed buildings.

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Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

Best r factor for attic insulation.

Let s say the insulation you ve selected has an r value of three per inch. R values for each type of insulation. 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. As a benchmark one inch of solid wood has an r value of 1.

Add insulation to attic. In general an attic s r value should be between r 30 and r 49. Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation. In particularly cold climates you might go up to r 60.

Warmer climates only require an r 38 or higher or about 12 or more. Existing 3 4 inches of insulation. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.

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