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R value of 12 inch concrete wall. Above grade concrete wall including inside and outside air films r 1 2 for 6 inch r1 4 for 8 inch concrete block wall with air in cavities r 2 0 concrete block wall with perlite in cavities r 2 9. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Block type density fill r in 32 x 48 48 x 48 48 x 72 72 x 72 problock 85 pcf 4 6 0 224 0 199 0 183 0 166. 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.
Cavity wall r values are listed in tek 6 1c r values of multi wythe concrete masonry walls ref. The r values u factors listed in this tek were determined by calculation using the code recognized series parallel also called isothermal planes calculation method refs. Concrete sand gravel aggregate. 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 inch 0 47 inch 0 63.
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. Typical residential weight concrete 8 wall r 2 5. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. 8 inch problock 12 inch problock.
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. Block and cavity fill. 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. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3.
As we said before the r value measures the thermal resistance of a material. The key to maximizing whole wall r values of concrete masonry walls is minimizing thermal bridges within the concrete masonry units.
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