R Value Of Concrete Wall Above Grade

3 for tabulated r values of walls with core insulation.

R value of concrete wall above grade.

Recommended home insulation r values. The walls have rebar of various diameters imbedded throughout. 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. I am trying to determine r values for poured in place concrete walls both above grade and below grade at varying thicknesses.

The higher the r value the better the thermal performance of the insulation. R value is a measure of insulation s ability to resist heat traveling through it. The walls i am working with vary from 6 inches thick for one wall and 10 12 and 14 inches thick for other walls. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50.

Meaning that icf walls are expected to cut the conduction losses through foundation and above grade walls by nearly half. As for the furring used for interior insulation the thermal resistance of the concrete masonry webs and any grouted cores should be accounted for when determining the thermal performance of the wall see tek 6 2c ref. By placing 2 inches of extruded polystyrene within a tilt up panel as a sandwich panel the material r value of that wall is increased to 11 49 with air film coefficients of 0 85. Concrete block wall with perlite in cavities r 2 9.

A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other. R inch r thick ness insulation materials fiberglass batt 3 14 fiberglass blown attic 2 20 1 fiberglass blown wall 3 20 rock wool batt 3 14 rock wool blown attic 3 10 rock wool blown wall 3 03 cellulose blown attic 3 13 cellulose blown wall 3 70 vermiculite 2 13 air entrained concrete 3 90 urea terpolymer foam 4 48. Concrete block wall with air in cavities r 2 0. When using core insulation the insulation should occupy all.

Concrete and block walls. The insulating materials used for these systems range in r value. 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 block makes a cost effective and structurally sound wall but it has.

For example if you have a type of insulation. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.