Attic Insulation Thickness R Value

Foam in place insulation can be blown into walls on attic surfaces or under floors to insulate and reduce air leakage.

Attic insulation thickness r value.

Achieving greater r values in exterior walls. 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 depends on the type of insulation its thickness and its density. Recommended home insulation r values.

Insulation levels are specified by r value. There are many ways to retrofit a home with fiberglass and. The higher the r value the better the thermal performance of the insulation. Your home s age if your home is more than 10 year old you likely need more insulation.

Meaning if you use a tight air seal you don t need to use as high of a total r value. Where you live different climates require different insulation r values. For example residential icc code 5 2 9 r806 5 for attic insulation says air impermeable insulation is not required to meet the r value minimum listed in the chart above. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

As a benchmark one inch of solid wood has an r value of 1. Insulation project calculator how to install naima r value certification product training videos colab learning video library for pros distributor locator why owens corning insulation propink vs. The r value of some insulations also depends on temperature aging and moisture accumulation. R value is a measure of insulation s ability to resist heat traveling through it.

R value is a measure of insulation s ability to resist heat flow. You can achieve better thermal performance in your attic by adding an additional layer of insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.

You can use the small pressurized cans of foam. The higher the r value the better the thermal performance of the insulation. When calculating the r value of a multilayered installation add the r values of the individual layers. Spray foam pink fiberglas vs.

Insulation level are specified by r value. Here s another specific code example. Add the right kind of insulation. The higher the r value the better the thermal performance of the insulation.

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