Let s say the insulation you ve selected has an r value of three per inch.
Best r factor for attic 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.
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.
Recommended insulation levels for retrofitting existing wood framed buildings.
Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.
In general an attic s r value should be between r 30 and r 49.
Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.
Add insulation to attic.
As a benchmark one inch of solid wood has an r value of 1.
R values for each type of insulation.
Call 513 341 8918 or contact us online today for expert insulation services in the cincinnati ohio area.
Existing 3 4 inches of 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.