R Value Of 8 Inch Poured Concrete Wall
What is the r value of a typical 8 inch thick cast in place residential basement wall.
R value of 8 inch poured concrete wall. Depending on the density of the blocks an 8 inch thick block wall without any other type of insulation has a thermal resistance value between r 1 9 and r 2 5. Eps block forms poured in place with concrete block walls 1 7 8 thick 15 2 15 7 103 7. R value r value of 8 20cm concrete block 1 11 r value of 12 30cm concrete block 1 28 r value of 8 20cm poured concrete 0 64 r value of 4 10cm brick 0 80 r value of 1 3cm sheetrock 0 45 r value of 1 3cm sheathing 1 31 for comparison. The insulation may be poured directly into walls or emptied into a simply wood or metal hopper which can be slid along the wall to direct the free flowing perlite into cores of cavities thus insulating all voids and air pockets.
I agree mostly with junio s answer. See citations at masonry below. 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. 8 thick concrete slab or foundation wall has an r value of about 1 04 30 while lightweight aggregate filled 8 thick concrete has an r value of about 2 18 30.
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. But concrete is a conductor of thermal energy not an insulator. 2 x 4 wood stud wall 16 o c r 11 batts 1 2. Material r value per inch r value per unit inside air film 0 68 air space between studs 0 95.
Concrete block 8. I have seen r values for concrete ranging from 0 08 to 0 12 r per inch so a 10 inch wall will be somewhere between 0 8 and 1 2 r. R value of single pane glass 0 91. Wood frame walls 3 plus r value of the insulation used.
Insulated forms available. Concrete block 4 inch hollow core. However too many people confuse insulation properties with thermal mass many icf dealers d. Concrete block walls u values r values.
Block thickness in inches. Therefore technically it has no insulation value.