Best R Factor For Attic Insulation
In particularly cold climates you might go up to r 60.
Best r factor for attic insulation. In general an attic s r value should be between r 30 and r 49. Recommended insulation levels for retrofitting existing wood framed buildings. Let s say the insulation you ve selected has an r value of three per inch. As a benchmark one inch of solid wood has an r value of 1.
Existing 3 4 inches of insulation. Call 513 341 8918 or contact us online today for expert insulation services in the cincinnati ohio area. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. 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.
Warmer climates only require an r 38 or higher or about 12 or more. Add insulation to attic. 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. Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation.