R Value Of Concrete Wall Below Grade

Above grade concrete wall including inside and outside air films r 1 2 for 6 inch r1 4 for 8 inch.

R value of concrete wall below grade.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. The r value listed by pca for a normal weight 144 pcf 6 inch concrete wall is 1 23 and includes inside and outside air film resistances which contribute to overall thermal resistance. 564 to obtain copies of this reference. For example if you have a type of insulation.

The r value of an uninsulated 8 inch thick basement wall built using normal weight concrete is 1 35 based on data from the 1993 american society of heating refrigeration and air conditioning engineers handbook. Insulation level are specified by r value. Other engineering sources cite the r value of earth as about r 0 25 per inch or double our calculation. R value is a measure of insulation s ability to resist heat traveling through it.

R 0 125 per inch for soil sounds pretty reasonable if we assume about 20 moisture content and if we consider for comparison or a sanity check that the r value of uninsulated concrete is about r 0 8 inch. Ensure minimal long term moisture absorption. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. Find your zone on the map and then use the above insulation r value chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.

Concrete and block walls. The higher the r value the better the thermal performance of the insulation. Concrete block wall with perlite in cavities r 2 9. The table below shows what levels of insulation are cost effective for different climates and locations in the home.

In addition to r value stability rigid foam insulations differ in their rates of moisture absorption and their ability to dry. Call pca at 847 966 6200 ext. Concrete block wall with air in cavities r 2 0.