R Value Of 8 Inch Poured Concrete Wall

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. 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. Concrete block 8.

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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.

R value of 8 inch poured concrete wall.

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 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. 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.

2 x 4 wood stud wall 16 o c r 11 batts 1 2. What is the r value of a typical 8 inch thick cast in place residential basement wall. 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. Wood frame walls 3 plus r value of the insulation used.

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. See citations at masonry below. Eps block forms poured in place with concrete block walls 1 7 8 thick 15 2 15 7 103 7. Block thickness in inches.

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. I agree mostly with junio s answer. R value of single pane glass 0 91. Therefore technically it has no insulation value.

Insulated forms available. 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. Concrete block 4 inch hollow core. Material r value per inch r value per unit inside air film 0 68 air space between studs 0 95.

However too many people confuse insulation properties with thermal mass many icf dealers d. Concrete block walls u values r values.

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