Attic Insulation R Value Map

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.

Attic insulation r value map.

Included is our r value guide detailing the suggested amount of insulation dependent upon zone as provided by the u s. The r value of some insulations also depends on temperature aging and moisture accumulation. 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.

There are many ways to retrofit a home with fiberglass and. Insulation level are specified by r value. 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. 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.

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. In order to comprehend how insulation works it helps to understand that the three main. 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. Your home s age if your home is more than 10 year old you likely need more insulation.

The map and chart show each region of the u s the subsequent zones and corresponding r values. The r value can be substantially lowered if the material becomes moist or wet. Recommended home insulation r values. When calculating the r value of a multilayered installation add the r values of the individual layers.

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 a southwestern state or other areas with generally warmer temperatures you might need attic insulation with an r value of only r 30. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. The higher the r value the better the thermal performance of the insulation.

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.