Attic Insulation R Value Zone 4

Department of energy recommended r values for add insulation to attic zone 4.

Attic insulation r value zone 4.

Insulation level are specified by r value. 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. Recommended home insulation r values. Also included is the hugely helpful insulation zip code calculator that spells out the suggested amount of r value necessary for the different portions of a structure like foundation interior and.

Included is our r value guide detailing the suggested amount of insulation dependent upon zone as provided by the u s. Walls should be between r 19 to r 21 basement walls r13 to r 19. Floors r 25 to r 30. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

Uninsulated attic attic insulation run between r 49 to r 60. To find out how much attic insulation you need for a home located in 4 zone without any existing attic floor insulation according to the table recommended minimum r value is r38 wee need to perform this simple calculation. As a benchmark one inch of solid wood has an r value of 1. R value is a measure of insulation s ability to resist heat traveling through it.

R38 divided by r3 2 cellulose 11 875 loose fill insulation thickness. 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 along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.