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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 12 concrete wall. Concrete block wall with air in cavities r 2 0. Concrete block 12 inch 1 28 brick 4 inch common 0 80 brick 4 inch face 0 44. 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. Table 2 presents r values of uninsulated concrete masonry cavity walls with 4 6 8 10 and 12 in.
Typical residential weight concrete 8 wall r 2 5. 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. A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other. The reason that it is important to make a good estimate for the current r value for uninsulated spaces is that small changes in r values result in large changes in heat loss when the total r value is low.
The schundler company 150 whitman avenue p o. 102 mm hollow unit concrete masonry veneer. As we said before the r value measures the thermal resistance of a material. 102 152 203 254 and 305 mm backup wythes and a 4 in.
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. R value tables traditional three web units. Concrete block wall with perlite in cavities r 2 9. 0 13 0 64 30.
Concrete sand gravel aggregate. Cavity wall r values are listed in tek 6 1c r values of multi wythe concrete masonry walls ref. R values u values coverage charts. Box 513 metuchen new jersey 08840 0513.
By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. Block and cavity fill. 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. Cellulose blown wall 3 70 vermiculite 2 13 air entrained concrete 3 90.
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