Attic Insulation R Value Zone 4

Existing attic 3 4 inches of insulation r 38.

Attic insulation r value zone 4. Department of energy recommended r values for add insulation to attic zone 4. The table below shows what levels of insulation are cost effective for different climates and. Floors r 25 to r 30. Uninsulated attic attic insulation run between r 49 to r 60.

Recommended home insulation r values. Insulation level are specified by r value. R38 divided by r3 2 cellulose 11 875 loose fill insulation thickness. R value is a measure of insulation s ability to resist heat traveling through it.

As a benchmark one inch of solid wood has an r value of 1. 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. The higher the r value the better the thermal performance of the 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. 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.