California Attic Insulation R Value

R value is a measure of insulation s ability to resist heat flow.

California attic insulation r value.

There are many ways to retrofit a home with fiberglass and. Recommended home insulation r values. Insulation levels are specified by r value. If kraft or foil faced insulation is used it should be installed per manufacturer recommendations to minimize air leakage and avoid sagging of the insulation.

Almost all insulation products have to tell you their r value pipe and duct insulation are the only exceptions. The insulation must also meet the manufacturer s specified minimum weight per sq ft. 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.

When calculating the r value of a multilayered installation add the r values of the individual layers. Your home s age if your home is more than 10 year old you likely need more insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Minimum r 22 attic insulation unvented attics must be air sealed at roof deck eaves gables and penetrations.

The r value of some insulations also depends on temperature aging and moisture accumulation. Well your attic has a dramatic impact on the temperature throughout the rest of your home as well. U factor for a wall includes the effects of framing sheathing cavity insulation continuous insulation and interior. Where you live different climates require different insulation r values.

Achieving greater r values in exterior walls. California title 24 2020 high performance attics walls. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. Why attic insulation r value matters for california homeowners at this point you may be wondering why this r value matters so much especially when it s for an attic that you probably go into once a year to fetch your christmas decorations.

Add the right kind of insulation. The table below shows what levels of insulation are cost effective for different climates and. The higher the r value the better the thermal performance of the insulation. The greater the number the greater the resistance to heat movement and the better insulating factors it has.

You can achieve better thermal performance in your attic by adding an additional layer of insulation. R value is a measure of insulation s ability to resist heat traveling through it. Insulation level are specified by r value. Duct wrap is covered so if you re looking at insulation with an r value of 38 from company a and insulation with an r value of 38 from company b you ll know the two products offer the same level of insulation.

The higher the r value the better the thermal performance of the insulation.