Best R Factor For Attic Insulation

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Best r factor for attic insulation. As a benchmark one inch of solid wood has an r value of 1. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Add insulation to attic. In particularly cold climates you might go up to r 60.
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. Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation. Warmer climates only require an r 38 or higher or about 12 or more. 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.
R values for each type of insulation. Let s say the insulation you ve selected has an r value of three per inch. Existing 3 4 inches of insulation. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.