R Value Of Concrete Wall Above Grade

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.

R value of concrete wall above grade.

Insulation level are specified by r value. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Meaning that icf walls are expected to cut the conduction losses through foundation and above grade walls by nearly half. 3 for tabulated r values of walls with core insulation.

R value is a measure of insulation s ability to resist heat traveling through it. When using core insulation the insulation should occupy all. 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. The insulating materials used for these systems range in r value.

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

Concrete block makes a cost effective and structurally sound wall but it has. Concrete block wall with perlite in cavities r 2 9. For example if you have a type of insulation. 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.

I am trying to determine r values for poured in place concrete walls both above grade and below grade at varying thicknesses. Above grade concrete wall including inside and outside air films r 1 2 for 6 inch r1 4 for 8 inch. Insulating value first the r value of buildblock s polystyrene alone is r 20 compared to wood frame s r 9 to r 15 and concrete block of r 2. A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other.

Concrete and block walls. Concrete block wall with air in cavities r 2 0.