Attic Insulation R Value Map

See the department of energy s doe ranges for recommended levels of insulation below.

Attic insulation r value map.

The table below shows what levels of insulation are cost effective for different climates and. The map and chart show each region of the u s the subsequent zones and corresponding 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. Where you live different climates require different insulation r values.

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. The r value of some insulations also depends on temperature aging and moisture accumulation. 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 higher the r value the better the thermal performance of the insulation.

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. The r value can be substantially lowered if the material becomes moist or wet. Included is our r value guide detailing the suggested amount of insulation dependent upon zone as provided by the u s.

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. There are many ways to retrofit a home with fiberglass and. When calculating the r value of a multilayered installation add the r values of the individual layers. 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.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Recommended home insulation r values. Insulation level are specified by r value. R value is a measure of insulation s ability to resist heat traveling through it.

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. Your home s age if your home is more than 10 year old you likely need more insulation.