R Value Of 8 Inch Poured Concrete Wall

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. However too many people confuse insulation properties with thermal mass many icf dealers d.

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Therefore technically it has no insulation value.

R value of 8 inch poured concrete wall.

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. 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. Eps block forms poured in place with concrete block walls 1 7 8 thick 15 2 15 7 103 7. Concrete block walls u values r values.

Concrete block 4 inch hollow core. Concrete block 8. Block thickness in inches. R value of single pane glass 0 91.

Bigman aug 11 2005 01 33am 4 i understand that concrete itself has little r value but i thought i had read in the forums somewhere that when you completely insulate the foundation on the exterior the thermal. What is the r value of a typical 8 inch thick cast in place residential basement wall. Wood frame walls 3 plus r value of the insulation used. 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.

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. Concrete block 8 inch 1 11 concrete block 12 inch 1 28 brick 4 inch common 0 80 brick 4 inch face 0 44 poured concrete 0 08 soft wood lumber 1 25 2 inch nominal 1 inch 1 88 2 x 4 3 inch 4 38 2 x 6 5 inch 6 88 cedar logs and lumber 1 33 sheathing materials plywood 1 25 inch 0 31. 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. As we said before the r value measures the thermal resistance of a material.

But concrete is a conductor of thermal energy not an insulator. I agree mostly with junio s answer. See citations at masonry below. Insulated forms available.

Material r value per inch r value per unit inside air film 0 68 air space between studs 0 95. 2 x 4 wood stud wall 16 o c r 11 batts 1 2.

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