Attic Insulation R Value Map

For houses in a southwestern state or other areas with generally warmer temperatures you might need attic insulation with an r value of only r 30.

Attic insulation r value map.

R value is a measure of insulation s ability to resist heat traveling through it. Insulation level are specified by r value. R38 divided by r3 2 cellulose 11 875 loose fill insulation thickness. There are many ways to retrofit a home with fiberglass and.

In order to comprehend how insulation works it helps to understand that the three main. 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. See the department of energy s doe ranges for recommended levels of insulation below. The higher the r value the better the thermal performance of the insulation.

Included is our r value guide detailing the suggested amount of insulation dependent upon zone as provided by the u s. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. The r value can be substantially lowered if the material becomes moist or wet. R value insulation chart 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.

The table below shows what levels of insulation are cost effective for different climates and. Installing more insulation in your home increases the r value and the resistance to heat flow. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. Where you live different climates require different insulation r values.

The r value of some insulations also depends on temperature aging and moisture accumulation. Recommended home insulation r values. But newer homes in central and southern arizona are insulated to ratings of r 30 to r 38 while newer homes in northern arizona generally have attic insulation at r 60 because of colder winters. The amount of attic insulation needed to obtain certain r values is influenced by the outside climate and the type of energy gas or electricity used to heat or cools a property.

For houses in the northeastern united states or other colder areas you might need attic insulation with an r value as high as r 60. The map and chart show each region of the u s the subsequent zones and corresponding r values.