Attic Insulation R Value Map

The r value can be substantially lowered if the material becomes moist or wet.

Attic insulation r value map.

R value is a measure of insulation s ability to resist heat traveling through it. 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. There are many ways to retrofit a home with fiberglass and.

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. Your home s age if your home is more than 10 year old you likely need more insulation. The r value of some insulations also depends on temperature aging and moisture accumulation. Included is our r value guide detailing the suggested amount of insulation dependent upon zone as provided by the u s.

The table below shows what levels of insulation are cost effective for different climates and. 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 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. Recommended home insulation r values.

The map and chart show each region of the u s the subsequent zones and corresponding r values. Where you live different climates require different insulation r values. Insulation level are specified by r value. 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.

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

Installing more insulation in your home increases the r value and the resistance to heat flow. 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.