External Wall Insulation R Value

Thickness density and type of materials are some factors that contribute to.

External wall insulation r value.

R value is a standard unit of measurement for determining among many things how effective your insulation will be. Higher r value numbers mean that the insulating material resists the cold or heat from the outside better. Insulation level are specified by r value. When calculating the r value of a multilayered installation add the r values of the individual layers.

Recommended home insulation r values. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. As with attics or anywhere else in your home adding more layers of insulation to your exterior walls is key to having a higher r value and better thermal performance. The higher the r value the better the thermal performance of the insulation.

Foam board insulation is easy to install between wall studs and over existing blanket insulation. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Achieving greater r values in exterior walls. The truth is this studs have an r value of 3 5.

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 refers to absolute thermal resistance. In simple terms r values measure the effectiveness of insulation and a higher number represents more effective insulation. R value is a measure of insulation s ability to resist heat traveling through it.

Installing more insulation in your home increases the r value and the resistance to heat flow. 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. For instance if you have a material with an r value of 12 attached to another material with an r value of 3 then both materials combined have an r value of 15.